For the little it's worth, long description here:
Short story: Biostar TA970 Plus is a megacrap, that throttles at 3.5Ghz. I install one of my spare Asrock 970 Extreme3 (never used) and the damn thing throttles at 4Ghz (my first identical motherboard never throttled at that speed, even at summer).
So, this is my first ever "ghetto" solution... Credit for the idea goes to Alastair
, because i got the idea of somewhat immobilizing a fan between other parts from his VRM cooling. In my case, i couldn't find a way to fix the fan on the VRM. So i fixed it where i could. Near the northbridge. The fan is a Scythe Mini Kaze Silent 60mm that i had. And let me tell you, it is really silent. I also added a 2nd case fan (Arctic F12 at 1300rpm). Which is noisy though.
Anyway, passed IBV Very High at 4Ghz...
So, identical motherboard model and i saw that: 1) Was throttling at 4Ghz (the other wasn't). 2) Needs 1.20v to undervolt at 3.5Ghz (the other needed 1.18v).
Moreover, it can't run 4 RAM sticks at 1T (the UD3P can).
Anyway, i am sticking to this solution for now. The small fan is quite stable, because it slightly presses on the GPU, which is slightly bended to the side, but nothing dangerous, so i don't think the fan will be dispaced easily. The fan is basically crammed between the GPU and the CPU cooler. You can turn the case upside down and the fan won't fall. It's pretty stuck in that position, for as long as i don't remove the CPU heatsink.
The logic behind it was simple: The NB was hot. THe whole area in AM3+ is influced by the heat of surrounding components and heat travels following gradient (hotter-->cooler). So if the NB gets cooler, it will draw heat from the socket, which on its turn will get cooler and draw heat from the VRM. And it worked. I thank my high school Physics teacher!
I had to remove the Scythe Rasetsu, to make space for the upper side fan and put the Scythe Katana3, which is less capable, but temps at 3.5Ghz were the same if not slightly better, so i thought "let's go for 4Ghz!". And it worked. (IBT screens in the link above).
OK, socket temp hit 70C, but most of the time it was 65C. Considering that IBT is about 20W more than x264, i will stay like this until i buy new motherboard, probably in December. I really can't put the UD3Ps to work for some months. I hate their guts. So i 'd rather buy a new motherboard with enough phases to avoid this ghetto thing.
Anyway, once more undervolting FTW! It just needed a bit of extra help this time. Compared to the UD3P, i now lost the 1T on the RAM, but it will do as it is.
EDIT: Oh yes and next time i order, i will buy several such mini Scythe fans, as well as many Arctic Thermal pads. I will replace EVERY SINGLE crappy thermal pad i have on motherboards and northbridges on all my motherboards. End of story. The ones that ship the mobos with are cheap crap.
Oh and i will order a couple more Scythe Katana3, before they disappear from the market. They are terrific for 4Ghz and leave space to put fans around them, plus second case side fan. Plus, they also cool the VRM.Edited by Undervolter - 10/4/16 at 5:06am