Question Which power cable to use to connect GPU?

[Kromaggg]

My set:
PCPartPicker Part List

CPU: AMD Ryzen 7 7800X3D 4.2 GHz 8-Core Processor (£394.99 @ Scan.co.uk)
CPU Cooler: ARCTIC Liquid Freezer III 240 A-RGB 48.82 CFM Liquid CPU Cooler (£67.95 @ AWD-IT)
Motherboard: ASRock X870 Steel Legend WiFi ATX AM5 Motherboard (£241.97 @ Overclockers.co.uk)
Memory: TEAMGROUP T-Force Delta RGB 32 GB (2 x 16 GB) DDR5-6000 CL30 Memory (£111.53 @ Amazon UK)
Storage: Crucial P3 Plus 4 TB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive (£192.99 @ Ebuyer)
Case: NZXT H6 Flow RGB ATX Mid Tower Case (£109.00 @ Computer Orbit)
Power Supply: Corsair RM850x SHIFT 850 W 80+ Gold Certified Fully Modular Side Interface ATX Power Supply (£119.99 @ Scan.co.uk)
Case Fan: NZXT F RGB Core 89.48 CFM 140 mm Fans 2-Pack (£49.99 @ Amazon UK)
Total: £1288.41
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2024-10-10 06:50 BST+0100

I'm considering GPU as prices go down:
7900 xt (£610 for xfx or £700 for nitro)
7900 xtx (£750 for xfx or asrock model)

Xtx looks tempting with current price but I'm worried as I've seen it require 3x 8 pin chargers.

My ATX need 2x 8 + 1x24
That leaves my PSU with only 2 more 8pin sockets.

Any idea how can I make this work or would I need new PSU?

 

[Lutfij]

My ATX need 2x 8 + 1x24
That leaves my PSU with only 2 more 8pin sockets.
I think you're confusing EPS connectors and 8pin PCIe connectors.

https://assets.corsair.com/image/upload/corsairmedia/sys_master/productcontent/WW_RMxShift_Series_Web_QSG_AA.pdf?_gl=1*e98wi6*_gcl_au*MTMzMjcyNzEzNy4xNzI0NDcyNjY4

According to your PSU's manual, page 5,the unit comes with 2x8pin EPS connectors which can each be broken down to 4+4pins, then you have the 24pin connector for the main connector on the board, then you have 2x8(6+2)pin PCIe connectors that are standalone while a third PCIe 8pin connector/harness is in the box that is daisychained. You can still use one end of it on the GPU if you decide to go with the XTX.

If that didn't make sense, perhaps you can look through this guide;
https://knowledge.seasonic.com/arti...ark-for-high-power-consumption-graphics-cards
different PSU brand and model but same principle/concept.

Lastly, PCIe connectors and EPS connectors are keyed/notched different so they cannot be forced in vice versa unless you strong arm them into submission.