That's barely an overclock since the stock 4690k will hit 3.9 GHz... and note that on stock settings using the stock cooler, you will be at 85C in less than a minute.
Prime95 long the standard for overclocking has frankly outlived it's usefulness.
1. The new Prime 95, the ones that use AVX and other newer extensions can easily fry your CPU. This is because, unless you control voltage manually (no adaptive / power savings measures) , voltage spikes when AVX is present can go up by 0.13
2. So many folks use the older P95 that does not use these extensions..... so if you pass P95for 4 hours, all you have accomplished is that you proved that your system is stable when those instructions are not present. But what about when they are ? Like when you are running actual programs ?
3. I still use prime95 for the purposes of setting TIM.... I'll bring CPU temps up quickly to over 85C for a few seconds and then let it cool to room temperature..... after a few cycles of this, most TIMs (not AS5) will be well set.
4. I then use RoG Real Bench because:
a) I have had systems 8 hour P95 stable that come crashing down after 45 minutes in RB; the reason is RB presents a widely varying combination of instruction sets in a multi-tasking environment. P95 just hammers away with one specific load at a time.
b) With that constant hammer, P95 will stress the CPU doing one specific thing and do it in a way that your PC will never, ever see again. So P95 might present you with a 80C temp situation, when nothing else you ever do on that will have it break 65C. In other words, you have just limited your OC for it's entire lifetime based upon the fact that it hit 80C using a utility that you will never run again. If you use RoG RB, then not only have you proved stability in ways P95 won't catch, you will also wind up with a higher OC because you are not limiting the OC because you had an 80C ceiling, and stopped the OC at 4.2
c) When AVX and other instruction sets are used in RoG RB, the "Real" in "Real Bench" comes from the fact that the test suite uses "Real" programs. Things that your PC might actually see again on its lifetime. When these instruction sets are used, voltage to the CPU will spike. If you use a quality monitoring program (HWiNFO64 recommended) , you will see voltage spikes jumping up in some pretty good jumps. Now when voltage goes from 1.375 to 1.505 under RoG RB, that's not a scary thing as it's only getting up there for a microsecond and dropping back down. But using a synthetic, that boost can be sustained and that is not what we want.
A 980 Ti (TDP = 165 watts) for example will experience peak power draws more than twice that value (359 watts) before overclocking.
http://www.techpowerup.com/reviews/Gigabyte/GTX_980_Ti_G1_Gaming/28.html
Your PSU doesn't blow up because that's what capacitors are for (storing power for short term peaks) and your cooling system doesn't melt down cause that 165 is an average . However, if you have two of those cards pulling a constant 359, then either the cards or the PSU are going to an early grave.
As I said above, with the Hyper 212, you should be 2 hour RoG RB stable up to 4.4 / 4.5 Ghz. Your lowest core might be 70 and highest at 79 which is more than fine. I do about 71 - 78 on RoG RB, typically see low 50s to mid 60s in gaming.
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