Corsair klarar det på 2 så det är enligt specifikation. 3 klarar det galant (har ju samma och får 600W som limit till mitt kort) då de flesta PCIE idag klarar att ge över 300W per uttag (såvida du inte har nått noname PSU från Kina).
https://cablemod.com/support/#12vhpwr-pcie-gen-5-atx-3-0
"DON’T PCI-E PORTS ONLY PROVIDE UP TO 150W PER PORT? HOW IS IT THAT A 3 X 8-PIN CABLE CAN BE SUFFICIENT TO POWER GPUS THAT REQUIRE UP TO 600W AT PEAK?
In truth, an 8-pin PCI-e port on modern PSUs can supply over 300W of power each (up to 342W, depending on model). Thus, two 8-pin PCI-e ports are more than enough to provide the required 600W. We provide both 3 x 8-pin and 4 x 8-pin versions of this cable for extra redundancy. **Please note that all 8 Pin PCI-e plugs need to be plugged in for the cable to function properly. If you order a 3 x 8-Pin or 4 x 8-Pin to 16-Pin, make sure that all of the 8-pin connectors are connected correctly to your PSU.**"