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RX 7900 XT I picked up comes with 3 8-pin power connectors. Do I need 3 seperate PCI-E cables connected from the PSU or can I get away with two?
I picked up the parts for my build today and discovered that while my MSI GAMING TRIO CLASSIC Radeon RX 7900 XT GPU has 3 8-pin connectors for power, my PSU (Gigabyte UD850GM 850 W 80+ Gold) only comes with two PCI-E power cables in the box, with two connectors daisy chained on each cable. Can I get away using both the PCI-E connectors from one of the cables when connecting to the GPU, or should I go back and get a PSU that comes with three separate PCI-E cables? Would I be creating any risk by trying to build and power on the machine with the current PSU?
For reference, here's the full build: PCPartPicker Part List
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i5-13600KF 3.5 GHz 14-Core Processor | $379.00 @ Canada Computers |
| CPU Cooler | Deepcool AK620 68.99 CFM CPU Cooler | $84.99 @ Canada Computers |
| Motherboard | MSI PRO Z790-P WIFI ATX LGA1700 Motherboard | $264.99 @ Canada Computers |
| Memory | Corsair Vengeance 32 GB (2 x 16 GB) DDR5-6000 CL36 Memory | $149.90 @ Canada Computers |
| Storage | Western Digital Black SN770 2 TB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive | $164.99 @ Canada Computers |
| Video Card | MSI GAMING TRIO CLASSIC Radeon RX 7900 XT 20 GB Video Card | $1119.00 @ Canada Computers |
| Case | Corsair 4000D Airflow ATX Mid Tower Case | $119.99 @ Canada Computers |
| Power Supply | Gigabyte UD850GM 850 W 80+ Gold Certified Fully Modular ATX Power Supply | $129.99 @ Canada Computers |
| Operating System | Microsoft Windows 11 Pro OEM - DVD 64-bit | $184.99 @ Canada Computers |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total | $2597.84 | |
| Generated by PCPartPicker 2023-05-20 21:50 EDT-0400 |
Edit: I'm seeing differing opinions but I'll probably try going back and getting a better power power supply. I figure better safe than sorry. Thanks for the advice all!
these commentors are wrong, you are fine daisy chaining one with the split ends
Yeah, two is perfectly fine for a 315W card. Even if the cables are made to the minimum possible spec (and they're most likely not since most PSUs use overspec cables these days), each cable is good for at least 150W, and the slot is good for another 75W.
150 + 150 + 75 = 375
375 > 315
I'm pretty sure there are only three connectors to make sure no one tries to run the card on a single daisy-chain, which would be possible with only two and could potentially be a safety hazard.
3 is optimal, 2 is fine
My 6950XT and my 3080 FTW3 Ultra are both running off two cables into three ports and have been for a while.
its fine, i have a 7900xtx and rtx 2070 daisy chained with a i9 10850k under a bequiet dark power pro 850 it can still pull over the 375w max power limit, occasionally hitting 400+, no bluescreen, restarts
Got to love the fearmongering from people who don't even understand the question.
I am running an ASUS TUF 7900XT OC with the same setup you are talking about it runs absolutely fine with 2 cables.
It will not be an issue whatsoever.
That power supply is fine. The UD GM and AP GM are both fine. It's the older P GM that had issues. By the way, any 850 watt power supply you get is going to have two pcie cables each with two daisy chained connectors. This is the normal configuration of a power supply.