(even after restarts, cold boots, driver/software reinstalls, the capture software refuses to put load on the GPU while it's in "prefer maximum performance") Switching power management to "prefer maximum performance" brings the GPU clocks up to max but then game capture refuses to put any load on the GPU at all, it basically hovers between 1-2% load, and the stuttering in preview is even worse. The core/mem clocks are hard locked to their minimal setting of 400mhz/100mhz. In full default NVIDIA settings (power management mode set to optimal power) I can see the load on my GPU dipping from 30% down to 20-24%, and each dip coincides with a stutter in the preview. Monitoring resources through GPU-Z and Task Manager is showing that the Game Capture HD/4k Capture Utility is not using my system resources properly (or at all). I do have a terrible work-around "solution" but have not found any proper fix as of yet. Update: I've narrowed down the problem but I have no idea what's causing it. This means warmer temperatures at idle, louder fan noise, etc but at least I am now able to capture at 60fps without massive stuttering. I needed to disable EIST, All C-States (C1E, C3, C6 etc), RC6 Render Standy, and anything to do with Sleep/Hibernation. The only way around it is to disable absolutely every step-down and power saving feature in the BIOS which forces your PC to run at maximum performance all the time. Your system remains at idle performance no matter which power settings/power options you select in Nvidia control panel or Windows power settings. The PC will literally sit there like it's idle even if 25% of your GPU and 50% of your CPU are being used. It is to do with the programming of the capture card and the way it interacts with software, it is designed to run as a background process meaning that regardless of how many system resources it uses, the operating system will not increase clock speeds or ramp anything into a high performance setting. Resolved (mostly): Elgato support were unable to help, I'm actually still waiting on a reply from their escalated tech support (3 weeks and counting) but I was able to resolve the issue with a few caveats.
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