Got the same Aio water loop and FX 8350 cpu so your in luck.
First of all you should know what speed you can reach, or the maximum overclock you will get out of a FX 8350 cpu is not just
dependent on the cpu or how good the quality of it is, but it helps.
A good quality motherboard is also required along with good voltage control features of it and power phases.
In any case the average FX 8350 cpu can reach up to 3.8Ghz or a 800 Mhz overclock of the cpu.
4.2 Ghz and the temp you have is about right, and the cpu core voltage should be around 1.360v
Up to 4.6 Ghz you are looking at a core voltage of around 1.4v where the temp of the cpu can reach around 46c to 48c when the cpu is stress tested for stability
As you increase the multiplier setting in the bios of the motherboard to overclock the FX cpu a small increase in small stages may be required in the Cpu core voltage settings of 0.250Mv to 0.500Mv settings in order to pass the windows booting to desktop mode and as said to pass a cpu stress test for stability, and loading of the cpu with tempreture rises.
At about 1.5v on the cpu core around 4.8Ghz can be reached, but the cpu temps will very rapidly rise in Idle mode to 48c or 49c.
And putting the cpu under stress if stable and you make it to windows desktop, the cpu under a stress test may reach around 66c or more.
The total, or maximum cpu votage you can reach for the cpu core is 1.6v
But I do not recommend setting it to 1.6v. 1.55 should be the max to give a bit of lea way.
At 1.55v keep a very close eye on the cpu temp. and be ready to stop any cpu stress test if the cpu heats up rapidly to above 66c. Dynomite.
Always leave the base clock for the bus speed of the cpu and memory at 200Mhz setting.
To be honest, a double radiator cooled loop should be used as from 4.8Ghz things get hot pretty fast.
As I said you may hit 4.8Ghz or if very lucky 4.9Ghz at 5Ghz it can be a real struggle to reach due to heat.
And also how good the motherboard is at coping with voltages ect.
Max I reached on the FX 8350 was 4.8Ghz @ 64 c.
With lots of case, chassis fans running.
And a dual push pull fan config on the corsair H60 radiator. FYI.
100% stable for 12Hrs testing under Prime 95.
Asus M5A99X EVO R2.0 motherboard.
16Gb 2400Mhz XMP @ 2200Mhz.
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