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How to connect my graphics card to my PSU?

 
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post #1 of 10 (permalink) Old 04-16-2019, 02:21 AM - Thread Starter
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How to connect my graphics card to my PSU?

I was wondering how to better connect my new graphics card to my EVGA SuperNova 650W G2 PSU (https://www.techpowerup.com/reviews/...erNOVA_G2_650/). Until recently I’ve used Asus ROG Strix GTX 970 OC graphics card that had single 8-pin power connector and there was no question of how to connect it. Now I bought Asus ROG Strix RTX 2070 OC 8 GB Gaming graphics card that has one 6-pin and one 8-pin power connectors. This card also has two 4-pin PWM fan headers and an addressable RGB header. The recommended PSU power for this graphics card is 550w. This graphics card will be installed on Asus Maximus VII Hero motherboard with overclocked Intel Core i7-4790K CPU.

What is the optimal way to connect this new graphics card to the PSU? It’s probably worth noting that I also plan to overclock this graphics card. The PSU has two connectors for graphics card(s) marked as VGA1 and VGA2. I assume this PSU is capable of powering two graphics cards. Should I use a single 6-pin + 8(6+2)-pin PCI-E VGA cable or two of these cables and connect one of them to 6-pin connector and the other to 8-pin connector? If you recommend using two of these cables, does it matter if I plug 6-pin or 8-pin end of the cable to card’s 6-pin connector? Strangely enough, only 6-pin extension is equipped with capacitor. From all I’ve read and saw so far the conclusion is to use two separate cables as they will give more stable and cleaner power. On the other hand, this will create a cable mess as each cable has a 6-pin extension. Will it cause any damage to my graphics card or PSU and will it affect the performance if I connect them with a single cable?

Thank you in advance!
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post #2 of 10 (permalink) Old 04-16-2019, 02:31 AM
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Quote: Originally Posted by G-Force View Post
I was wondering how to better connect my new graphics card to my EVGA SuperNova 650W G2 PSU (https://www.techpowerup.com/reviews/...erNOVA_G2_650/). Until recently I’ve used Asus ROG Strix GTX 970 OC graphics card that had single 8-pin power connector and there was no question of how to connect it. Now I bought Asus ROG Strix RTX 2070 OC 8 GB Gaming graphics card that has one 6-pin and one 8-pin power connectors. This card also has two 4-pin PWM fan headers and an addressable RGB header. The recommended PSU power for this graphics card is 550w. This graphics card will be installed on Asus Maximus VII Hero motherboard with overclocked Intel Core i7-4790K CPU.



What is the optimal way to connect this new graphics card to the PSU? It’s probably worth noting that I also plan to overclock this graphics card. The PSU has two connectors for graphics card(s) marked as VGA1 and VGA2. I assume this PSU is capable of powering two graphics cards. Should I use a single 6-pin + 8(6+2)-pin PCI-E VGA cable or two of these cables and connect one of them to 6-pin connector and the other to 8-pin connector? If you recommend using two of these cables, does it matter if I plug 6-pin or 8-pin end of the cable to card’s 6-pin connector? Strangely enough, only 6-pin extension is equipped with capacitor. From all I’ve read and saw so far the conclusion is to use two separate cables as they will give more stable and cleaner power. On the other hand, this will create a cable mess as each cable has a 6-pin extension. Will it cause any damage to my graphics card or PSU and will it affect the performance if I connect them with a single cable?



Thank you in advance!


No it shouldn’t matter. Use 2 cables if you can

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post #3 of 10 (permalink) Old 04-16-2019, 04:07 AM - Thread Starter
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I asked EVGA the same question and their answer was a bit convoluted: “You would use two separate cables 6+2 with only the 6 connected and a 6+2 or 8 pin connected to the 8pin port.” Even considering the results of this experiment (
), I wonder why bother with two separate cables if gain is so tiny? In view of these findings I would prefer to keep cable clutter to a minimum.
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post #4 of 10 (permalink) Old 04-16-2019, 04:28 AM
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Do you plan to OC the card at all?
If not then I wouldn’t worry about 2 cables and if you are then I’d suggest using 2.

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post #5 of 10 (permalink) Old 04-16-2019, 04:42 AM - Thread Starter
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Like I said before, I do plan to overclock the card.
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post #6 of 10 (permalink) Old 04-16-2019, 04:56 AM
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Since EVGA suggests to use 2 cables I’d go with that. Yes it’ll add more clutter but it’ll provide more clean power to the card.

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post #7 of 10 (permalink) Old 04-16-2019, 05:05 AM
 
 
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2070, you can use one cable. Card doesn't use that much juice. Around 225w overclocked. Myself I am using two cables for my Asus Strix 2070 from an Evga 1000w G3. I'm using the Evga custom sleeved cables that are single 8pin. But I'd be more than comfortable using a single stock cable that splits a 6pin and a 8pin(6+2) for a 2070.

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post #8 of 10 (permalink) Old 04-16-2019, 05:32 AM
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Hi,
Yeah they used to send splitters with gpu's so one could use just one 8 pin cable to connect both ports to the card.

It would be best to use two cables off the psu to the gpu though.

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post #9 of 10 (permalink) Old 04-16-2019, 07:30 AM
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Make sure you use VGA cables and connect the correct ends to PSU and to GPU. I use 2 cables, 6+2pin each with caps.
Don't use cables marked CPU or turn the cables around. Capacitors should go to the component side.

They don't always make these cables and connections dumb proof and one can easily by mistake connect it wrong and burn stuff up.
Never use cables from a different PSU without manually checking every single pin connection is identical to the one you need.
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post #10 of 10 (permalink) Old 04-16-2019, 08:39 AM
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Quote: Originally Posted by G-Force View Post
I was wondering how to better connect my new graphics card to my EVGA SuperNova 650W G2 PSU (https://www.techpowerup.com/reviews/...erNOVA_G2_650/). Until recently I’ve used Asus ROG Strix GTX 970 OC graphics card that had single 8-pin power connector and there was no question of how to connect it. Now I bought Asus ROG Strix RTX 2070 OC 8 GB Gaming graphics card that has one 6-pin and one 8-pin power connectors. This card also has two 4-pin PWM fan headers and an addressable RGB header. The recommended PSU power for this graphics card is 550w. This graphics card will be installed on Asus Maximus VII Hero motherboard with overclocked Intel Core i7-4790K CPU.

What is the optimal way to connect this new graphics card to the PSU? It’s probably worth noting that I also plan to overclock this graphics card. The PSU has two connectors for graphics card(s) marked as VGA1 and VGA2. I assume this PSU is capable of powering two graphics cards. Should I use a single 6-pin + 8(6+2)-pin PCI-E VGA cable or two of these cables and connect one of them to 6-pin connector and the other to 8-pin connector? If you recommend using two of these cables, does it matter if I plug 6-pin or 8-pin end of the cable to card’s 6-pin connector? Strangely enough, only 6-pin extension is equipped with capacitor. From all I’ve read and saw so far the conclusion is to use two separate cables as they will give more stable and cleaner power. On the other hand, this will create a cable mess as each cable has a 6-pin extension. Will it cause any damage to my graphics card or PSU and will it affect the performance if I connect them with a single cable?

Thank you in advance!
Quote: Originally Posted by MrTOOSHORT View Post
2070, you can use one cable. Card doesn't use that much juice. Around 225w overclocked. Myself I am using two cables for my Asus Strix 2070 from an Evga 1000w G3. I'm using the Evga custom sleeved cables that are single 8pin. But I'd be more than comfortable using a single stock cable that splits a 6pin and a 8pin(6+2) for a 2070.
THAT

using PCI Express Auxiliary Graphics Power Connectors as a guide; the current capacity rating of each terminal can vary from 8 to 12 amps. (actual PCI-E spec is 7 amps). using the MAX Power Handling table; the most i would comfortable run through a single cable (three 12v wires) is 288 watts.

mind you, i am looking at the single connector at the PSU that supplies the power to both the PCI-E connectors at the card. though 2 things i do that does error but on the side of caution:

though i also have a EVGA G2 PSU (750) i will still use the min rating of 7 amps in the specs as opposed to the likelihood that super flower (the OEM) uses the 11 or 12 amp rated terminals (for 400+ watts total power).

and the ~75 power (66 watts 12v) through the PCI-E slot, i'll consider all the power is drawn via cables. the amount of power varies from card to card, lots of turing cards hardly draw 40 watts.


hope this helps. bottom line, you'll be fine either way unless you're chasing those last few points in [X] benchmark like MrTOOSHORT.

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