I'm going to cross post this here. I also posted this in the HardOCP forum, but figured some people could enlighten me on it here too:
In any case I am thoroughly confused by how my 4790k is behaving on this motherboard on two fronts. First, the vcore, and second the clock boost, so I'm wondering if anyone can enlighten me. Let's be clear though, my cpu isn't misbehaving or unstable, I just don't "get" what's going on based on what the actual BIOS settings are telling me.
First, the Vcore, which I'm readily willing to admit I may be looking at wrong. I felt the default Vcore under "auto" settings was too high (sitting at 1.215V in the BIOS), so I first set it manually, but the CPU wouldn't idle at all when running, so then I decided to use voltage offset.
My first time into the BIOS the displayed voltage while in "Auto", which stayed the same when I went to "Normal" to utilize the offset, was 1.215V. I tried an initial -0.035V offset and it was fine. So I went back to the BIOS to increase the negative offset, however, the display Vcore had inexplicably changed to 1.100V, as shown here:
http://i.imgur.com/VEdcF99.png
The only way to get it to set back to 1.215V (besides doing it manually) was to set it to Auto again and reboot the PC. However, the minute I went back to offset adjustment, rebooted and re-entered the BIOS again it had changed back 1.100V again. However, it obviously is not ACTUALLY using a 1.100V core voltage as the pre-offset maximum as show by my HWInfo while running AIDA64 stability test:
http://i.imgur.com/xhX9WKy.jpg
I thought the reported 1.100V is the max vcore available with the offset limiting the max to actually be lower. However, as shown above, my vcore under load is 1.188V so it can't be offsetting from 1.100V. Is this just the BIOS just misreporting its actual setting?
Finally, the frequencies. I thought turbo boost only worked to its advertised frequency on 1 or 2 cores at most. This is what the BIOS ratio settings indicate as well while in Auto:
http://i.imgur.com/sUw2sjf.png
However, when under load, all four of my cores are going to 4.4GHZ (well, 4.389GHZ actually, but who's counting):
http://i.imgur.com/V9X4Rko.jpg
I would have thought that a 4-core boost would only get a 4.2GHz boost. In fact, I've only ever seen a 4-core boost or nothing, even if I start up only two threads in Prime95 all four cores boost to 4.4GHz.
Is this unusual behavior or am I just misinformed?
Anyway, just hoped someone could enlighten me on these things here. Coming from Lynnfield maybe there's some Haswell voodoo I simply am missing.