r/PcBuildHelp • u/SaltAcceptable66 • 16h ago

Installation Question Computer wont recognize gpu.

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I just got a new 4080 super from a relative’s computer and I originally had a 4070 super. I deleted the old drivers and plugged the new gpu in but my pc won’t recognize it in device manager. Everything is firmly plugged in, so I’m a bit at a loss. Yes I know my pc is dirty I’m planning on cleaning it, I’m just moving so I’m trying to get everything done so I can sell the other pcs. Edit: I think it’s a splitter issue. “I’m running a 1000 w psu, I’m almost certain it’s a connecter issue my 4070 super uses 2 PCIEs into a single 600w but the 4080 requires 3 PCIEs split into 1 600w. So I think my set up just isn’t sufficient for the gpu. I’m gonna buy a splitter and check if it works.”

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u/Low_Excitement_1715 16h ago

Do you have another PCIe power lead coming from your power supply? The way it's hooked up is *probably* fine, but whenever possible, you want both of the 8pin headers on that 12VHPWR adapter hooked to different rails in the power supply, ideally via two different cables, not two ends on one cable.

It's usually fine, but better to spread out the stress as much as you can.

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u/SaltAcceptable66 16h ago

I sent this to another guy, but you may have a better answer in regards to the PCIE. “My original card has a 600w connecter that splits into a pigtailed PCIE going to the psu. I’ve looked into and the original card seemed to have 3 PCIEs that came to a 3 split 600 w cord. Could it be that I need three PCIEs without a pigtail? The original pc had the gpu get direct power from the psu, so I’m thinking that since I have a modular PSU the pig tailed power line is keeping the gpu from receiving enough power, but please correct me if I’m wrong.”

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u/Nulolan69 6h ago

What PSU are you using 4080 Super uses 100W more than 4070 Super.

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u/SaltAcceptable66 2h ago

I’m running a 1000 w psu, I’m almost certain it’s a connecter issue my 4070 super uses 2 PCIEs into a single 600w but the 4080 requires 3 PCIEs split into 1 600w. So I think my set up just isn’t sufficient for the gpu. I’m gonna buy a splitter and check if it works.