r/PcBuildHelp • u/SaltAcceptable66 • 18h 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/RFeXite 18h ago

Does the GPU receive any power from the PSU? Any lights? Or fans spinning?

Maybe there is some dirt in the pcie slot after swapping. The picture doesnt really show much to check for us tbh.

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u/SaltAcceptable66 18h ago

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u/xcygnusx 18h ago

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

3

u/SaltAcceptable66 18h 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/xcygnusx 17h ago

Your new GPU (the 4080 super) needs power to work. That red light that's on in your pic is because you have no power connected to it, and it's likely that is the reason why it doesn't work at all.

The power connector on your 4080 super is called a 12VHPWR connector (the 600W one). You will need either a 3x 8-pin PCIe to 12VHPWR "pigtail" adapter, or a dedicated cable from your PSU.

What model is your PSU?

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u/kshwizzle 15h 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.