Help needed with 5070Ti 12VHPWR adapter
Help needed with 5070Ti 12VHPWR adapter
I just received a new GPU with a 12vhpwr 3 PCIe adapter. However, my PSU (VGA Super NOVA 750 GT 750W 80 Plus Gold) doesn’t have 3 PCIe cables or slots. The current setup is:
- One PCIe cable in two of the adapter’s PCIe slots
- A second PCIe cable in the last slot
Many forum posts warn this configuration isn’t recommended, while others suggest it’s acceptable but advise replacing the PSU or using adapted cables. What should I do? I’ve been using it for a day without issues so far. If I need a cable, which one would you recommend? I haven’t found any compatible ones in Brazilian stores; I think buying an 850W Supernova would be better.
I would purchase a power supply with the cable already included.
I have my own view on this. A 5070 Ti uses about 300 watts. An 8-pin PCIe port on the power supply is designed for 150 watts. A motherboard PCIe slot can handle up to 75 watts going to a graphics card. How many 8-pin PSU ports are connected to your machine? There are two, each providing 150 watts, totaling 300 watts plus up to 75 watts from the PCIe slot—more than enough for a GPU with a 300 watt TDP. Your current configuration with a 2×8pin to 3×8pin to 12pin setup is quite basic, but it works just fine as long as you don’t plan to keep it for a long time. Consider using MSI Afterburner and lowering your GPU’s maximum power draw to 80% temporarily if you’re concerned. You should definitely look into getting a better, higher-quality power supply soon. I recently purchased an RM750x for my secondary PC, which came with a 12-pin to 12-pin cable with individual sleeves.
Thank you for your detailed message.
I've looked into the wattage rating of the PCIe cable from my PSU, which is 300 watts per slot, or 150 watts each way. That seems correct.
If I upgrade to a better PSU, my main concern is whether parts are available locally, and I hope it will be soon.
I'll keep your advice about limiting power draw in mind.
Thanks again!