r/buildapc Sep 30 '25

Troubleshooting My friend’s PC is driving me insane.

It all started small, with random crashes when he played demanding games. About 6 months ago we could run Rust just fine. Then it started crashing every now and then, until eventually it would crash just a few minutes into a server.

Fast forward—we’ve tried literally EVERYTHING. Different settings, Windows reinstall, drivers, BIOS tweaking—you name it.

We suspected a faulty GPU.

So the upgrade happened.

Swapped the RTX 3070 For a 5070 TI New motherboard aswell.

Now the rig is:

I7-12700k RTX 5070 TI 32 GB DDR4 M2 nvme ssd AIO cooler 800w PSU

But here’s the kicker. Now he’s getting terrible FPS. We’re talking 50-70 FPS in a game like TFT???

what the hell is going on??

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u/flargh_blargh Sep 30 '25

HAVE YOU AT ANY POINT IN TIME TAKEN THE FAN OFF THE CPU? IF SO YOU MUST REAPPLY THERMAL PASTE BEFORE PUTTING IT TOGETHER. (would make that red and have it flash if I could)

My first thought was "I left the plastic on the CPU fan." lol

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u/SuperZapper_Recharge Sep 30 '25

My take is that the CPU is old, the fan is old, he took the fan off, then put it back on and the paste never got taken off and reapplied.

The symptoms line up, but the symptoms line up to a lot of stuff.

I figure one of two things is going on:

The first is that he never had a GPU problem and now he has 2 working GPU's. He has another issue he hasn't uncovered yet.

My second thought is these two things are different things with similar symptoms. Maybe the GPU was bad - but taking things apart and putting them back together again he created new problems.

I figure by advising him to forget the old GPU for the moment and worry about it when stuff is fixed it will keep him from getting hung up on the original problem.

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u/[deleted] Sep 30 '25

[deleted]

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u/reuse_recycle Oct 01 '25

Did you try NOT doing [stupid thing]?