be sure to tell us (just me probably... no trinity love here it seems
) how it goes, especially the bios options though i guess they're probably similar to the spcr asus review.
it's probably a long shot but if you have a power meter some numbers would be great too.
It took some time before I got around to build it, but my new pc is now up and running!
The bios has the same options as the one in the spcr review of the Asus F2A85-M Pro
Unfortunately I don't own a power meter, but maybe there are some other questions I can answer?
Before messing around with manual adjustments I want to see the difference between the three different presets "powersaving", "normal" and "asus optimal". For stress testing I used Prime95 and MSi Kombustor simultaneously. I have no case fan active and the room temperature was 18C.
idle: mobo 28 C cpu 23 C fan 775 rpm Vcore 0.948 V
load: mobo 37 C cpu 47 C fan 980 rpm Vcore 0.948 V
Under load the CPU frequency kept mostly at 2,3 Ghz, with occasional jumps to 2,6 or 3,7 GHz.
load: mobo 38 C cpu 49 C fan 1099 rpm Vcore 1.008 V
Under load the CPU frequency again kept mostly at 2,3 Ghz, with occasional jumps to 3,7 GHz.
The moment I closed Kombustor (prime95 was still running) I noticed the Vcore jumped up 1,3V and then to 1,22V. The CPU frequency then kept switching between 3,0 en 3,4 GHz, with occasional spikes to 3,7 GHz. Temperatures stayed the same. As soon as I started Kombustor, the CPU frequency and Vcore were lowered again.
Asus optimal mode
load: mobo 38 C cpu 49 C fan 1074 rpm Vcore 1.008 V
Frequency was mostly 2,3 GHz with spikes to 2,6 and 3,8 GHz. With Kombustor turned of, the frequency changed to 3,0-3,5 GHz with a Vcore of 1.176-1.248V
It seems as though the CPU frequency is lowered to 70% when the system expects the graphics part of the APU to be generating heat. Apparently it's normal trinity behavior to lower the max CPU frequency when the GPU is under load, but it seems like a very large difference. I would have expected it to just stop going into turbo.
I played around with the CPU voltage offset:
-0.150V: boots, but freezes on starting prime95
-0.125V: boots, but blue screen after 10 seconds of prime95
-0.100V: boots and no problems sofar
I am a bit confused: Asus probe and CPU-Z are giving different values for the core voltage. CPU-Z is about 0.35V higher.