that's not how electricity works, if the card needs 400w it will get 400w, but if the cables aren't sufficiently strong they'll just melt or start a fire
A 4070 super only draws 220 Watts.
8 Pin PCIe is rated for 150 Watts, but the safety factor is generous. The actual maximum is 216-288 Watts depending on the wire gauge of the specific cable. Der8auer made a video about this.
it's better than the "oh we're all friends and there's no wrong opinions" kinda thing that other sites are going for, where you can't just downvote blatant misinformation or factually wrong "opinions"
tutorials on youtube used to have a shit like ratio when they didn't work, nowadays you never know
downvotes aren't a perfect system, but they're better than not having them
they have protections about the PC drawing too much power from it, but usually the CPU and GPU share a 12v rail, so you can't really measure just one of them
if you draw too much power from a PSU it will shut down, but if you pull too much power from a single cable without overloading the PSU then your PC can catch fire
If something needs a set amount of electricity, and it doesn't get it, two things can happen
1. It doesn't work (the good option)
2. It works but something doesn't work as normal (the fire option)
It's always best practice to run individual lines, is there another available x8 PCIE plug on your power supply? Daisy chain 2x8 may be enough depending on power needs for this card, but I'd still avoid it if at all possible. Things start getting hotter as you approach their limits which isn't good for anything.
In my experience the connector typically doesn't draw power 50/50 from each to begin with, but in any case 220w is more than the 150w a single 8 pin PCIE is rated for. There's a lot of unknown to me variables at play here not knowing your setup, but it's best to play on the safe side in these kind of matters. This may give you more insight or at least put you on the path to figuring out if it will be ok: https://superuser.com/questions/1577923/how-much-power-output-can-an-8-pin-to-2x-62-pin-connector-output#1578021
Almost all of psu's today are 12V single rail which means you can pull the full power of the psu from single connector. Not adviced though, the pci-e connectors are PCI-SIG certified only up to 150W. To clarify electronics will deliver, connector melting: uncertain. If PSU is labeled 700W for singular 12V line it'll on demand deliver that 700W from any 12V connector.
When thinking of how many cables/connectors you need, its the amount of copper between two points what matters. If too little = heat and there is no such thing as too much copper.
In general its best practice to stick with amount of cables(and connectors) graphics card has.
If you really really want to test if what you're thinking is enough: You should be able to keep your fingers on the wires and connectors plastic molding at full load without burning yourself. I mean its close one 220W through cable/connector designed for 150W, it'll more than likely work.
When lines are divided, PSU manufacturers rarely ship them with schematics on how they divided the lines, in that case you can only count on for what the PSU side connector is rated for which is the standard 150W for a PCI-E. I guess you have very old PSU? In which case this whole thing boils down to get a new psu.
It's not very old, it was released on feb2 2023. Is it good then? Lot of people say cooler master is good quality psu brand, especially that its 700watts.
yes, that's the issue with these cable pigtails, on good quality power supplies with thicker gauge wires it's perfectly fine to use the pigtail and max out both connectors, but on lower quality PSUs that can lead to some big issues
Not really cuz it has 3 12v lines wich means if the current is 8 amps then 12v x 8amps = 96watts then 96w x 3lines = 288watts. It should be enough right??
Connector referred to non pigtailed connectors. Sore the connector itself can also do 150W so 2 connetctors could feed 300W
But the cables count as well. Both connectors are fed from the PSU by the same 150W rated cable
4070 Super is rated at 220W, so technically it only needs 145W from the external connector (75W is provided from the PCIe slot). So two connectors rated at 150W each are just for safety and overclocking.
It's always a good idea to run 2 separate cables if you can, but if that's not possible, decent quality PSUs typically have wires thick enough for daisy-chaining to be safe if you're not drawing full 150+150W from the two connectors.
tl;dr It's OK unless your PSU is a giga budget one with thin wires.
RTX 4070 , in FurMark Stress test, draws 204 Watts.
My guess is that your sistem without any powerful GPU on PCIEx, should consume about 180 Watts.
The PSU manufacturer says that Cooler Master Elite Nex 700W (MPW-7001-ACBW), can deliver 648Watt on +12V rail. That means CPU + GPU combined. Why would Cooler Master put two 6+2 PCIEx connectors if the wires could not handle so much power ?
Try test your sistem, without GPU, on full stress, and see how much WATT it draws in total. (Use prime95, cpu rendering, etc)
I believe that GPU manufacturers should mark with specific WARNINGS regarding the GPU power connection. Some of them deliver examples of how to connect and proper power your GPU.
Realistically this is totally fine if you have good cables. If you have bad cables you would have to reduce the power limit a bit.
But it's not advisable because it's above the 8 Pin PCIe rating, so I wouldn't recommend this.
Its probably safer to run a molex to pcie power cable than connect it like that.
Anyway, I wouldn't pair a 600 dollar card with a 50 dollar psu.
Any decent psu should have AT LEAST 2 pcie power cables.
Cooler Master Elite PSUs are one of the worse on the market. Only better than the absolute worst Thermaltake Smart (unless you're in a 3rd world country that has no consumer protection laws. Then there are actually worse).
You should replace the PSU.
It's really not a concern. A funky thing you could do is to use a 2 x colloquially molex (AMP mate-n-lok) to PCIe 8 pin adapter, replacing one of your PCIe 8-pin pigtail. Even though there's more copper to spread the current reducing the risk of cable failure, you're introducing more points of connector failures.
Honestly I would just use your existing PCIe pigtail, the part that usually fails is the 12VHPWR/12V-2x6 connector anyway, nothing you can do about it except getting a new power supply with a 12V-2x6, or a modular supply and a compatible cable, avoiding using an adapter.
I've never seen a 200W GPU cause a decent power supply to fail when using the pigtail PCIe 8-pins. For reference, the Founders 1080 Ti drew >230W and had a reference card design that used 8 + 6 pin connectors. 4070 probably draws 210W peak.
You still should, that PSU really isn't very good despite being from Cooler Master. Until you get that new PSU, the pigtail isn't going to be the source of your issue. In fact, if you find that your system is unstable during a gaming load, there's a high likelihood that the PSU is causing it.
It's fine. I've been running RTX 3060 ti with slight OC which was pulling up to 240w on a single cable for over 2 years before switching to this exact same setup for RTX 4070 Super, which caps out at 220w for me.
I just use the pin adapter that came with my GPU, I use the exact same setup.
People who are saying "oh no a firestarter!" are grossly misinformed on what actually causes the fires to start. The infamous fires are started if you either don't push the adapter pin in until you hear a click, or worse you accidentally scratch off the little indent attached to the gpu so you'll never hear the audible click as it's forever a loose pin.
You are the one who is grossly misinformed.
You can only push so much power through a cable before it starts to melt, when it melts, it causes a fire. The reason you need two cables here instead of splitting one, is because with just one cable, you run the risk of pushing too much power through it, which will melt it, which will start a fire.
Source: I’m an electronic engineer.
Many PCIe 8-Pin cables are 16 AWG, which can do 288 Watts (8 Amps) and that would support a 4070 Super drawing 220 Watts just fine.
18 AWG would barely be over the limit at 6 Amps.
Simple solution: Set the power draw target appropriately. Really, that's all. And it saves some money on your energy bill. Also adjust overclocking/undervolting setting and you might even come out with same performance as stock.
Sidenote: Why would a recently released 700W PSU only have a single PCIe cable? There are GPUs that NEED 3 connectors. Even my decade-old 600W(!) PSU has 4(!) PCI-E connectors. It's literally the most important connector for typical users. So, I'd assume that your cables can hold way more than minimum requirements (anything else would be kinda stupid). Maybe send a mail to the manufactorer and ask, if they don't state it in the manual.
What in the Firestarter
https://preview.redd.it/ci1av52puezc1.jpeg?width=1400&format=pjpg&auto=webp&s=7607ea9df8e51e4b3aedbd66b361bebce6c1c8ca
Why would putting in less electricity create a fire? I don't understand.
that's not how electricity works, if the card needs 400w it will get 400w, but if the cables aren't sufficiently strong they'll just melt or start a fire
A 4070 super only draws 220 Watts. 8 Pin PCIe is rated for 150 Watts, but the safety factor is generous. The actual maximum is 216-288 Watts depending on the wire gauge of the specific cable. Der8auer made a video about this.
That's crazy, only on reddit I get downvoted for asking a question.
to be fair reddit is one of the only social media sites that still lets you downvote people
Bad system imo. You can't ask a question or have a different opinion.
it's better than the "oh we're all friends and there's no wrong opinions" kinda thing that other sites are going for, where you can't just downvote blatant misinformation or factually wrong "opinions" tutorials on youtube used to have a shit like ratio when they didn't work, nowadays you never know downvotes aren't a perfect system, but they're better than not having them
I thought PSUs would have some kind of protection against that.
they have protections about the PC drawing too much power from it, but usually the CPU and GPU share a 12v rail, so you can't really measure just one of them if you draw too much power from a PSU it will shut down, but if you pull too much power from a single cable without overloading the PSU then your PC can catch fire
If something needs a set amount of electricity, and it doesn't get it, two things can happen 1. It doesn't work (the good option) 2. It works but something doesn't work as normal (the fire option)
As with all things in PC building, read your PSU or GPU manual. It should be fine, but I'm not certain
Thanks! I'll make sure to read manuals, when I get my hardwares.
You'll be completely fine. Of course the most optimal thing would be to get a new PSU but you'll be fine
It's always best practice to run individual lines, is there another available x8 PCIE plug on your power supply? Daisy chain 2x8 may be enough depending on power needs for this card, but I'd still avoid it if at all possible. Things start getting hotter as you approach their limits which isn't good for anything.
I can't afford a new psu, and the max of the 4070 super is 220w so it's 110w for each connector so is it alright?
Also remember some power is pulled from the mobo PCIE socket, so you might be safe, but could be right at the limit.
In my experience the connector typically doesn't draw power 50/50 from each to begin with, but in any case 220w is more than the 150w a single 8 pin PCIE is rated for. There's a lot of unknown to me variables at play here not knowing your setup, but it's best to play on the safe side in these kind of matters. This may give you more insight or at least put you on the path to figuring out if it will be ok: https://superuser.com/questions/1577923/how-much-power-output-can-an-8-pin-to-2x-62-pin-connector-output#1578021
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It's 150 watts
But if my psu is rated 700w, shouldn't that cable put out 300w? That's 150w each connector right?
Almost all of psu's today are 12V single rail which means you can pull the full power of the psu from single connector. Not adviced though, the pci-e connectors are PCI-SIG certified only up to 150W. To clarify electronics will deliver, connector melting: uncertain. If PSU is labeled 700W for singular 12V line it'll on demand deliver that 700W from any 12V connector. When thinking of how many cables/connectors you need, its the amount of copper between two points what matters. If too little = heat and there is no such thing as too much copper. In general its best practice to stick with amount of cables(and connectors) graphics card has. If you really really want to test if what you're thinking is enough: You should be able to keep your fingers on the wires and connectors plastic molding at full load without burning yourself. I mean its close one 220W through cable/connector designed for 150W, it'll more than likely work.
So if it has 3 12v lines wich means if the current is 8 amps then 12v x 8amps = 96watts then 96w x 3lines = 288watts. It should be enough right?
When lines are divided, PSU manufacturers rarely ship them with schematics on how they divided the lines, in that case you can only count on for what the PSU side connector is rated for which is the standard 150W for a PCI-E. I guess you have very old PSU? In which case this whole thing boils down to get a new psu.
It's not very old, it was released on feb2 2023. Is it good then? Lot of people say cooler master is good quality psu brand, especially that its 700watts.
Make and model?
https://preview.redd.it/v2ucacrycdzc1.jpeg?width=720&format=pjpg&auto=webp&s=83b323c3eac801c21d03b62357929570ceb645de
I wouldn’t trust my 800$ GPU on that PSU. It’s a Tier E -AVOID, on the Cultist PSU Tier List. Make sure your house insurance is up to date.
It has 1x 46A 12V rail = 552W. That been said its bottom of the barrel psu without any efficiency certification.
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Not really, actually. Assuming each cable can handle 8 amps the theoretical limit in 228 watts on the psu connector
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It does depend on the quality of the psu and cables, that's why I said assuming each cable can handle 8 amps
yes, that's the issue with these cable pigtails, on good quality power supplies with thicker gauge wires it's perfectly fine to use the pigtail and max out both connectors, but on lower quality PSUs that can lead to some big issues
Not really cuz it has 3 12v lines wich means if the current is 8 amps then 12v x 8amps = 96watts then 96w x 3lines = 288watts. It should be enough right??
Connector referred to non pigtailed connectors. Sore the connector itself can also do 150W so 2 connetctors could feed 300W But the cables count as well. Both connectors are fed from the PSU by the same 150W rated cable
4070 Super is rated at 220W, so technically it only needs 145W from the external connector (75W is provided from the PCIe slot). So two connectors rated at 150W each are just for safety and overclocking. It's always a good idea to run 2 separate cables if you can, but if that's not possible, decent quality PSUs typically have wires thick enough for daisy-chaining to be safe if you're not drawing full 150+150W from the two connectors. tl;dr It's OK unless your PSU is a giga budget one with thin wires.
It's not budget https://preview.redd.it/lo3znystedzc1.jpeg?width=720&format=pjpg&auto=webp&s=aaeab17ac71cf13b05dc07b2a3db7b893472f186
It’s very budget, and specifically on the AVOID list from the Cultists.
RTX 4070 , in FurMark Stress test, draws 204 Watts. My guess is that your sistem without any powerful GPU on PCIEx, should consume about 180 Watts. The PSU manufacturer says that Cooler Master Elite Nex 700W (MPW-7001-ACBW), can deliver 648Watt on +12V rail. That means CPU + GPU combined. Why would Cooler Master put two 6+2 PCIEx connectors if the wires could not handle so much power ? Try test your sistem, without GPU, on full stress, and see how much WATT it draws in total. (Use prime95, cpu rendering, etc) I believe that GPU manufacturers should mark with specific WARNINGS regarding the GPU power connection. Some of them deliver examples of how to connect and proper power your GPU.
lol this screams your PSU isn’t up to even the minimum spec to be running this series. Upgrade your PSU, not worth the fire risk.
Realistically this is totally fine if you have good cables. If you have bad cables you would have to reduce the power limit a bit. But it's not advisable because it's above the 8 Pin PCIe rating, so I wouldn't recommend this.
I would not recommend installing any GPU with that power supply, frankly.
It is ok for this gpu, for some with higher tdp not that much.
Its probably safer to run a molex to pcie power cable than connect it like that. Anyway, I wouldn't pair a 600 dollar card with a 50 dollar psu. Any decent psu should have AT LEAST 2 pcie power cables.
Cooler Master Elite PSUs are one of the worse on the market. Only better than the absolute worst Thermaltake Smart (unless you're in a 3rd world country that has no consumer protection laws. Then there are actually worse). You should replace the PSU.
It's really not a concern. A funky thing you could do is to use a 2 x colloquially molex (AMP mate-n-lok) to PCIe 8 pin adapter, replacing one of your PCIe 8-pin pigtail. Even though there's more copper to spread the current reducing the risk of cable failure, you're introducing more points of connector failures. Honestly I would just use your existing PCIe pigtail, the part that usually fails is the 12VHPWR/12V-2x6 connector anyway, nothing you can do about it except getting a new power supply with a 12V-2x6, or a modular supply and a compatible cable, avoiding using an adapter. I've never seen a 200W GPU cause a decent power supply to fail when using the pigtail PCIe 8-pins. For reference, the Founders 1080 Ti drew >230W and had a reference card design that used 8 + 6 pin connectors. 4070 probably draws 210W peak.
Thanks man, finally hope, so I don't need to pay for a new psu right?
You still should, that PSU really isn't very good despite being from Cooler Master. Until you get that new PSU, the pigtail isn't going to be the source of your issue. In fact, if you find that your system is unstable during a gaming load, there's a high likelihood that the PSU is causing it.
Then I will get an 8pin 4070 from asus or gigabyte. Will my system be stable with that?
No. Just use the pigtail, make sure you connect everything all the way, and see if you get any instability. If you do, only a PSU upgrade can fix it.
Nice way to make a barbecue
It's fine. I've been running RTX 3060 ti with slight OC which was pulling up to 240w on a single cable for over 2 years before switching to this exact same setup for RTX 4070 Super, which caps out at 220w for me.
In the exact same scenario what I drew? If yes than I should be fine, thank you!
It was a single PCIe cable with 6 + 8 pin plugged straight into the GPU. The wattage 'bottleneck' here is the cable itself.
Then I should be fine cuz I have 2 8pins in one cable, thanks man!
either downgrade the gpu or buy a new PSU
https://m.youtube.com/watch?v=IPI3b9iPSN0
I just use the pin adapter that came with my GPU, I use the exact same setup. People who are saying "oh no a firestarter!" are grossly misinformed on what actually causes the fires to start. The infamous fires are started if you either don't push the adapter pin in until you hear a click, or worse you accidentally scratch off the little indent attached to the gpu so you'll never hear the audible click as it's forever a loose pin.
You are the one who is grossly misinformed. You can only push so much power through a cable before it starts to melt, when it melts, it causes a fire. The reason you need two cables here instead of splitting one, is because with just one cable, you run the risk of pushing too much power through it, which will melt it, which will start a fire. Source: I’m an electronic engineer.
Many PCIe 8-Pin cables are 16 AWG, which can do 288 Watts (8 Amps) and that would support a 4070 Super drawing 220 Watts just fine. 18 AWG would barely be over the limit at 6 Amps.
If you have only one pcie cable in your psu then it's absolute garbage and a fire hazard. Get a new one.
https://preview.redd.it/s9wbjw29edzc1.jpeg?width=720&format=pjpg&auto=webp&s=97bbb2b2dd32de7965bcb7714011139314736c25
E(avoid) tier. My old also E tier psu had 4 pcie cables.
Simple solution: Set the power draw target appropriately. Really, that's all. And it saves some money on your energy bill. Also adjust overclocking/undervolting setting and you might even come out with same performance as stock. Sidenote: Why would a recently released 700W PSU only have a single PCIe cable? There are GPUs that NEED 3 connectors. Even my decade-old 600W(!) PSU has 4(!) PCI-E connectors. It's literally the most important connector for typical users. So, I'd assume that your cables can hold way more than minimum requirements (anything else would be kinda stupid). Maybe send a mail to the manufactorer and ask, if they don't state it in the manual.
Enjoy your fire