[SOLVED] EVGA 3070 X3 on order. Can I use the 12pin to Dual 8 connector that came with my PSU?

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ScarofScion

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I have a AX850 GPU and its in excellent condition. It's a single rail design and it comes with a 12pin to dual 8 pin connector. Similar to this one this one from Corsair. I know the consensus is to use two separate cables and not daisy chain one 8 pin to dual 8pin. What is your opinion on one 12pin to dual 8pins? Looking at the the max rating on a 12 pin cable should be ~ 550watts.
 
Solution
bignastyid
The EVGA 3070 XC3 does not use the 12pin connector it uses 2 8 pin connectors. Afaik only the founders edition cards used the Nvidia 12 pin connector.
The Ax850 comes with 8-pin(psu side) to dual 6+2 pin cables you'd ideally want to use 2 of those cables. If you want a cleaner look you can get 2 custom single 8 pin or 6+2 pin cables.
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The EVGA 3070 XC3 does not use the 12pin connector it uses 2 8 pin connectors. Afaik only the founders edition cards used the Nvidia 12 pin connector.
The Ax850 comes with 8-pin(psu side) to dual 6+2 pin cables you'd ideally want to use 2 of those cables. If you want a cleaner look you can get 2 custom single 8 pin or 6+2 pin cables.
 
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Solution
bignastyid said:
The EVGA 3070 XC3 does not use the 12pin connector it uses 2 8 pin connectors. Afaik only the founders edition cards used the Nvidia 12 pin connector.
The Ax850 comes with 8-pin(psu side) to dual 6+2 pin cables you'd ideally want to use 2 of those cables. If you want a cleaner look you can get 2 custom single 8 pin or 6+2 pin cables.
Click to expand...
the AX850 actually came with a 12pin that goes into the PSU that goes to two 8 pins into the GPU. It would probably be best to use two separate 8 pin cables, but I thought if this 12pin will work then why not?
 
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I'm actually using a AX850 Gold and it actually has two 12 pin connectors:
013.jpg
 
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Well my bad, never seen that layout before.. But looking into it yes the 12-pin(psu side) to dual 8 that came with the PSU would be fine for the 3070. However that is the much older AX model and it may have issues handling the spikes a 30 series card can have.
 
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bignastyid said:
Well my bad, never seen that layout before.. But looking into it yes the 12-pin(psu side) to dual 8 that came with the PSU would be fine for the 3070. However that is the much older AX model and it may have issues handling the spikes a 30 series card can have.
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No worries. I was surprised that I had this cable in the bag all this time just never had the need for it until now. I'm not too worried about the PSU being older. It's in tip top shape. I'm willing to risk it since its never had any problems and I've been using ~350watt for the life of the PSU and kept it super clean and cool.
 
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The source of confusion was the use of terminology. Just for reference, pins on PSU sides of modular PSUs are not standardized at all, so nobody refers to the number of pins on the PSU side as if it's a universal standard. "12 pin to dual 8" would generally refer to some kind of proprietary 12-pin power connector from some prebuilt being converted to PCIE or occasionally someone converting two 6-pin connectors to two 8-pin connectors.

Where X to Y is used is when you're talking about an actual conversion of some connector to another connector, not just a normal modular power cable from the PSU to the connector. It's a small point, but an important one because precision is extremely important with safety equipment.
 
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DSzymborski said:
The source of confusion was the use of terminology. Just for reference, pins on PSU sides of modular PSUs are not standardized at all, so nobody refers to the number of pins on the PSU side as if it's a universal standard. "12 pin to dual 8" would generally refer to some kind of proprietary 12-pin power connector from some prebuilt being converted to PCIE or occasionally someone converting two 6-pin connectors to two 8-pin connectors.

Where X to Y is used is when you're talking about an actual conversion of some connector to another connector, not just a normal modular power cable from the PSU to the connector. It's a small point, but an important one because precision is extremely important with safety equipment.
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That's good to know. Thanks for the knowledge.
 
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So besides one thread with this issue reported on Seasonic 750 watt PSU and they were using 3080/3090s I haven't seen any problems with the 3070 with a 850 watt PSU. I'll report back by the end of this week once I install and test everything.
 
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I just got the 3070 and had a chance to test my power supply out and turns out the warnings above were correct. The AX850 simply does not have the correct cables to power a RTX 3070. At least not the EVGA 3070 XC3 Ultra. Using the 12pin modular to dual 8pin PCIE connectors would power up on the GPU but the motherboard would not detect it. No other cable that came with the PSU is compatible. I know the GPU is fine. When I swapped it over to my wife's computer with a recently purchased PSU the card came right up. I went ahead and ordered myself a RMX1000. Thanks for the help as always!
 
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--SID-- said:
That's 10 years old. Maybe not even work with Ampere and if it works it's a huge bottlekneck.

The motherboard has the latest BIOS?
Click to expand...

I understand my system is old, but I'm really curious to see how long I can keep my build for. I was proud to be a 10+ year owner. BUT..... I just found out the hard way that newer GPUs require UEFI boot and guess what? My MB doesn't have it. In conclusion my AX850 GOLD works to power 3070s, but my motherboard was not just a bottleneck but a ROAD BLOCK in that new GPUs will not POST unless they detect UEFI. What a ride it has been. I'm now trying to justify buying a 5950x 😆
 
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ScarofScion said:
I understand my system is old, but I'm really curious to see how long I can keep my build for. I was proud to be a 10+ year owner. BUT..... I just found out the hard way that newer GPUs require UEFI boot and guess what? My MB doesn't have it. In conclusion my AX850 GOLD works to power 3070s, but my motherboard was not just a bottleneck but a ROAD BLOCK in that new GPUs will not POST unless they detect UEFI. What a ride it has been. I'm now trying to justify buying a 5950x 😆
Click to expand...
That board likely just needs a bios update to add uefi support.
 
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ScarofScion said:
Unfortunately I've tried updating to the latest BIOS. This board just simply doesn't support UEFI as it wasn't a thing when this particular board was manufactured.
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Odd most retail boards of the era got bios updates to add UEFI support, you usually only see OEM(dell, hp, etc) boards that got snubbed for the update.

On a moderator note in the future please don't award yourself the best answer trophy.
"If you post a problem then find the solution (or an appropriate fix) yourself, it is appropriate to post the solution. However, you must not award yourself a Best Answer trophy "

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