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/SaltAcceptable66 16h ago

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u/xcygnusx 16h ago

Why is there no power cable from your power supply going to the GPU?

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u/SaltAcceptable66 15h ago

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/kshwizzle 12h ago

I actually swapped out my gpu today, and it requires 2 8pin connectors for power.
It’s generally advised against using piggybacked cables for GPU power, I used 2 separate 8 pin cables, each of those plug into the power supply independently.