Ensure you have installed
DirectX 9.0C for full compatibility and check that you have the latest graphics/hardware drivers.
Try to reduce the number of 3rd party 'utility'/drivers installed or restrict them from auto-starting during testing, many of them can cause odd issues, from infrequent glitches to runaway mem. usage, even BSODs.
A clean, streamlined Windows is much easier to troubleshoot than one loaded up with non-essentials/pretties.
Check the 3.3, 5 and 12v readings in the BIOS, compare them to those on your HWiNFO screenshot.
I also suspect that there can be (permissions?) issues specific to W8/8.1 compared to earlier versions, and even differences between W8 and 8.1. so ensure your drivers, esp. gfx, wireless, USB3 and any security/utility/autorunning software really is recently updated and fully compatible.