Originally Posted by BrEnKeR
Cool. Looks like I'm OK. Btw in BF3, cores 1, 2, and 4 are always near 47c and 49c while Core 3 goes up to like 56c.
That is probably OK. In Prime95 my peak temperatures are about 10C higher than BF3 and my peak Vcore is 0.008 higher than in BF3. In Prime95 my temperatures vary by core like I mentioned earlier. None of your temperatures are too high at all and you're well within a safe margin. The variances by core probably have to do with fan speed if you're using a variable fan speed profile for quiet gaming.
In BF3, my temperatures track very closely with one another (just like they do at idle) and have no more than a 2C variance. However, when things start to get hot, like above 60C, that's when I notice that my cores have a spread. You can see that from the 60/66/66/63 max temperatures. That has to do with my CPU clocking itself up to handle the game, then my fans lagging behind that slightly to come up to higher RPMs to account for the increased thermal load. Once the fans stabilize, my temperatures stabilize as well and settle in at pretty much dead-even. It's a function of case cooling, thermal paste application, heat sink and fan model, and cleanliness of the system in terms of airflow routing.
However, in Prime95, at the extreme temperatures, even 100% fan speeds won't keep the cores evenly cooled. Cores 1 and 2 (counting 0, 1, 2, 3) will always be hotter because my air-cooled system is operating at its thermal limit and it's adequate, rather than excessively efficient. For 24/7 BF3 gaming, my system keeps things nice and cool because the fans and heat sinks have enough efficiency to handle more thermal load than the game generates, thus everything tracks evenly even though CPU load by core does not.
Here are three screen-shots from my system when I ran BF3 in single-player to check out the temperature spread. You can see what I mean by the core use and the temperatures tracking in the screenshots.
Warning: Spoiler! (Click to show)
The first is my BF3 settings in the main window 1920x1200 and then what amounts to my full system specs and temperatures in the second monitor (1280x1024).
CPU-Z for CPU, Mainboard, and Memory, Task manager showing core and kernel use, Real Temp showing max temps (60/66/66/63) and eVGA NV-Z showing GPU settings.
(No, I didn't overclock my GPU; it came with those settings.)
BF3 Settings with temperatures. (BF3 settings are maxed out on ultra.)
1920x1200 windowed mode with temperatures (BF3 settings are maxed out on ultra.)
1920x1200 full screen with temperatures. (BF3 settings are maxed out on ultra.)
Long story short, you have nothing to worry about. If you want to be incredibly nit-picky about your system you could tweak your airflow in such a way as to get perfectly even temperatures at mild loads (say 80% of your max Prime95 blend tests) but I don't think that's necessary, unless you wanted to start operating your system up on the ragged edge of whatever heat boundaries you feel comfortable with. (My Prime95 limit is 80C and my everyday limit is 70C. I rarely exceed 65C.)Edited by shad0wfax - 11/17/11 at 1:27pm