MrZoraman

I don't think Linus's target audience was people who are willing to install custom roms when he recommended getting an old phone off of ebay.

At the end, Linus recommended rescuing an older phone off of ebay. I don't know if I agree, since odds are those old phones are no longer receiving software/security updates. I wish Linus brought up that caveat.

@Robchil I was looking at other SFF cases online. Most of them have riser cables. A few of them had notes that said "If your card is a PCIE 4 card, make sure to change it to PCIE 3 in the bios". I tried doing that on my computer, and the fans work again! So! The solution to this entire thing was for me to go into my BIOS and change the PCIE slot from 4 to 3. That riser you linked is PCIE 4, I'm guessing the riser that came with my case many years ago is PCIE 3, so getting an upgraded riser is the fix. I wonder if it is worth the $60 to upgrade from PCIE 3 to PCIE 4 for a GPU...

The case is a silverstone ML08B. I originally bought it for a build containing an i7 6700k so it's a little old, but not too old (right?).

That was it!!! I'm using a small form factor case so there's a little PCIE riser part that bends 90 degrees. I plugged my GPU into the motherboard directly and... the fans are spinning!! Thank you so much for helping me troubleshoot this. I never in a million years would have guessed a faulty connection between my GPU and the Motherboard. Wow! My previous GPU probably didn't die then... just the PCIE riser thing... ah well I needed an upgrade anyways. But man.... where do I go from here... try to get a replacement riser, or a new case... that's a question for another thread. Thank you again for helping me out. You spent a lot of time helping me and I can't thank you enough!

I've hooked up everything to the AX850. No fans spinning

Why? The CPU is working just fine. I thought this was just to rule out the 4070 not getting enough juice. I gave it all the juice it could want by putting it on the big power supply, and the results didn't change.

@Robchil I tried doing the setup I described earlier, and the fans didn't spin up.

Could I leave the SF600 in my computer but just have my other computer with the AX650 right up against it and plug my graphics card into that PSU, and then turn both computers on at the same time? I figure if the GPU works and fans spin up and such, then we've narrowed it down to the SF600 being too weak.

The 4070 was able to full throttle on the SF600 (furmark stress test) with no stability problems, just no fans turned on. I guess I could swap PSUs as a test, that's going to be a massive amount of work....

The system that it doesn't work in is a Corsair SF600. The system that it does work in is a Corsair AX850.

My current system has a 600W PSU. I had an RX Vega 56 in this system beforehand and that draws more power than the 4070 as far as I know (higher TDP).

So, here's my problem now.... I have GPU A and GPU B, and Computer 1 and Computer 2. A + 1 = Fail A + 2 = Works B + 1 = Works B + 2 = Works It's just this one combination of computer and graphics card that doesn't work. I guess this rules out a hardware problem...

@rippy4500 @Robchil I just tried the GPU in another system.... and the fans work just fine. My bewilderment is immeasurable. Where do I go from here....

Could you please point me to some resources for how to do that? Will this void my warranty? Where would I even find the latest vbios for my card?