AMD A10 PRO 8770E weird behavior under load

[fjfreitas]

I'm having a problem with a HP Elitedesk 705 G3 mini, that our company aquired about a year ago.

While trying to troubleshoot an overheating problem (turns out it wasn't overheating), we stressed the computer using furmark combining its gpu stress and the cpu burner, and found out that while the gpu was being stressed the CPU limited itself to around 25% of usage REGARDLESS of the cpu load applied, even tested prime95 instread of the CPU burner, but had the same results: 25% CPU usage with GPU stressing, and 100% without.

We later detected the same situation when usinng adobe premiere pro with windows opencl acceleration.

The temps when running both tests reached 70-75ºC

the PC:
HP Elitedesk 705 G3 mini
16gb
1TB SSHD
Windows 10 Professional x64

Have any of you faced a similar problem? is the APU unable to use both CPU and GPU fully? Or maybe this is a limit imposed by HP to keep it within the power / thermal contrains of the pc?

 

[COLGeek]

I am not surprised given that the APU serves as both CPU and GPU. I suspect that HP tweaked the BIOS to optimize stability (heat management) during peak performance utilization (like when benchmarking).