kramertorium

I recently switched PCs, and now my Logitech C920 webcam is behaving oddly. Using OBS for testing, the camera works reliably at 720p @ 25 fps, but when I set it to the normal 30 fps it drops to a few fps and stutters and lags. Totally unusable. At 1080, regardless of frame rate, it just freezes. At all times the system resources are barely utilized, and I confirmed the various USB ports I tried all work fine. The installed webcam driver is the generic Microsoft driver. (Note: It's not just OBS, the same problems are present in Zoom and Logitech's own Capture software)
 
The camera works fine on another PC I have in the house, even at 1080p@30fps; both PCs are of similar specs and are both on the latest update of Windows.
 
Attached is a very ugly video of a very tired me showing the problem.
 
Any suggestions would be appreciated, this has been a frustrating day of futile troubleshooting.
obs_25-vs-30-fps.mp4

Fair point about the actual required PCI lanes. The cards are physically x8, but of course those lanes may not all be required.
 
I think it's mooted b/c of Grabhanem reply; I found that newegg has a perfectly serviceable refurb hp z420 for $240, and I have 32gb ram I can re-use in it. That's more than I wanted to spend, but I think what I *wanted* was completely unrealistic, and I doubt I could get all the necessary parts for much less, even if I could find the right stuff.
 
thanks, y'all

I knew I came to the right place!

It was stupidity. I totally forgot that this CPU wouldn't support on-board video, but I also couldn't boot with the GPU installed...but that was before I re-seated the CPU and RAM...this time it worked.
 
I'm old, I've built a zillion PCs, but not in a long time. Clearly I got rusty.
 
Thanks everyone!