Originally Posted by Panda Bear
Wouldnt then suffice to get any FX-8xxx and use them as is because when encoding the turbo boost will always spin to 4 Ghz?
No! The turbo will never go to 4Ghz when encoding video, because video encoding loads 100% on ALL cores! An FX8320 has 2 turbos. One at 3.8 and one at 4.0. The one at 4Ghz is rarely used. It's used when 1 thread is running and the rest of cores are idle. This never happens in video encoding. The 3.8 is a bit similar, alhtough it works with 4 cores loaded and 4 idle. Again, this isn't going to happen in video encoding, only momentarily. Basically, AMD has made the turbos, in a way that they don't exceed ever the TDP limit. If the turbo would run at 4Ghz on all cores at stock voltage, it would exceed 125W TDP limit.
So, what you can do, is disable turbo and manually overclock to 4Ghz. You keep Cool N Quiet and when you encode you have all cores running at 4Ghz. As a bonus, you can actually do that while a bit undervolted. So at the end, you run with all cores at 4Ghz and without exceeding the 125W limit. For example, my 8320 comes with 1.325v stock voltage (if you disable turbo). But, to get to 4Ghz stable, you only need 1.27-1.28v (depends on the motherboard). So you run at 4Ghz undervolted (with less voltage than the 1.325v which is the stock voltage for 3.5Ghz that AMD ships the CPU).
The 8320E has lower stock clock, but overclocks with lower voltage than 8320. So you will be hitting 4Ghz with something like 1.23-1.25v, so you will be even better and certainly lower than 125W.
Basically, grab the cheapest 8 core you can find (8300, 8320, 8320E) and disable turbo and manually overclock to 4Ghz and you 're done. The 8320E will do that at the lowest voltage possible, followed by 8300 and finally 8320. And in practice you have a 8350, bought for less and running less hot/less power, because you undervolted it. So less stress on the motherboard too.Edited by Undervolter - 10/24/15 at 9:23am