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3x8pin PCIE 3080 with rm750x enough?

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So I was building my brother’s setup and when unpacking his GPU I saw that it had a whopping 3 individual 8pin power connectors on it (ROG 3080 strix). Looking at his psu I noticed that it only had 2 pcie cables. I was wondering if I should buy a new psu or grab a “1-to-2” pcie cable from a different machine, meaning I would use 2 cables to power a card with 3 connectors. Any thoughts? Thanks in advance.

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Power wise you'd be good with 2 cables, that's 300W +75 from the PCie slot, the 3080 use max 350W even OCed (320 at stock, less if undervolted)

And unless you use a 250W+ CPU your 750W PSU will be ok

 

If the card requires a 3rd connector use a splitter

System : AMD R9 5900X / X570 AORUS PRO/ 2x16GB Corsair Vengeance 3600CL18 (OCed to CL16)/ RTX3080 Gigabyte EAGLE GPU/ Phanteks P600S case / Customized Watercooling Eisbaer 280mm + Eiswolf2 360mm + VPP755 pump  and 150mm reservoir0.5TB Sabrent Rocket + 2TB WD SN850 NVme Gen4 + 4TB Toshiba X300 HDD drives/ Corsair RM850x PSU/ 34" 120Hz 3440x1440p Alienware AW3420DW monitor / Logitech G915TKL keyboard (wireless) / Logitech G PRO X Superlight mouse

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I had one of those.

The Strix uses 370 watts stock and 450 watts with the power limit all the way up. I would use 3 cables.

RIG#1 CPU: AMD, R 7 5900X| Motherboard: X570 AORUS Master | RAM: Corsair Vengeance RGB Pro 32GB DDR4 3200 | GPU: EVGA FTW3 ULTRA  RTX 3080 ti | PSU: EVGA 1000 G+ | Case: Lian Li O11 Dynamic | Cooler: EK 360mm AIO | SSD#1: Corsair MP600 1TB | SSD#2: Crucial MX500 2.5" 2TB | Monitor: LG 55" 4k B9 OLED TV

 

RIG#2 CPU: Intel i9 11900k | Motherboard: Z590 AORUS Master | RAM: Corsair Vengeance RGB Pro 32GB DDR4 3600 | GPU: EVGA FTW3 ULTRA  RTX 3090 ti | PSU: EVGA 1300 G+ | Case: Lian Li O11 Dynamic EVO | Cooler: Noctua NH-D15 | SSD#1: SSD#1: Corsair MP600 1TB | SSD#2: Crucial MX300 2.5" 1TB | Monitor: LG 55" 4k B9 OLED TV

 

RIG#3 CPU: Intel i9 10900kf | Motherboard: Z490 AORUS Master | RAM: Corsair Vengeance RGB Pro 32GB DDR4 4000 | GPU: MSI Gaming X Trio 3090 | PSU: EVGA 1000 G+ | Case: Lian Li O11 Dynamic | Cooler: EK 360mm AIO | SSD#1: Crucial P1 1TB | SSD#2: Crucial MX500 2.5" 1TB | Monitor: LG 55" 4k C1 OLED TV

 

RIG#4 CPU: Intel i9 9900k | Motherboard: AORUS Z390 Ultra | RAM: Ripjaws V Series 32GB DDR4 3200 | GPU: EVGA XC3 Ultra 3080 ti  | PSU: EVGA 1000 G+ | Case: Cooler Master H500 | Cooler: Noctua NH-D15 | SSD: Crucial P2 1TB  | SSD#2: Samsung 860 QVO 2TB | Monitor: LG 38" 3840 X 1600 75hz monitor.

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Corsair don't use crappy 18g cables. 2 cables with 3 connectors is fine. 2 cables are rated for almost 650w.

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Thanks for all the fast replies. From what I’ve been reading, 1 8pin pcie cable can deliver 150w. In other words, I would need 3. Unless of course the pcie slot supplies the rest, not quite sure how the power management works internally.

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