Wow, I felt like I kinda lost out on the sillycone lottery myself with my 6700k since the most stable OC setting I have found in regards to extra performance without a ton of extra heat is 4.5GHz core & uncore at 1.32v with XMP set to profile 1 on 32GB (4X8GB) of 3200MHz G. Skill RipjawsV. I've never touched the VCCIO or VCCPLL & my RAM has ran flawlessly at 3200MHz. Even if I push the Vcore voltage up & set the 6700k at 4.6 or 4.7GHz I can still run XMP & remain stable, unfortunately at 4.6MHz with 1.36v the temps get a little hot for my liking. At those settings my chip will hit as high as 83C during XTU'x stress test & hit as high as 74C while playing the most demanding games, 4.7 at 1.38v gets a bit hotter even. Not terrible temps but the extra 100 or 200MHz really don't add that much extra performance to justify letting my chip run that hot IMO. Although reading this thread makes me wonder, if I manually tune the VCCIO & VCCPLL will it take some stress of the CPU & allow for higher clocks with less heat? Hmm, maybe I didn't do too bad in the silicone lottery & an OCing session is in order sometime this weekend? @cowbawx
Your temp issue could be a couple things & some testing will need to be done in order to pinpoint the issue. Poor thermal paste or just a poor application of the paste could be to blameOff the top of my head I would 1st see what version of P95 you are using since some versions are known to push SL chips very very hard. I believe there is a recommended version for use with SL chips in the SL OCing guide here on OCN. Give the XTU stress test or Real bench stress test a try & see what type of temps they produce on your chip. With my CPU set to 4.5GHz core/uncore at 1.32v & XMP enabled the max temps I see in those benches at those settings is 76C.
Also I doubt you have damaged your CPU in any way from the OCing you did previously. Modern CPUs have a ton of different self protection mechanisms that do a great job of keeping a chip from frying itself. The only sure fire way I know of damaging your CPU when OCing is by not paying attention to what you are setting in the BIOS & forgetting a decimal point or putting one in the wrong place while setting voltages & highly over volting the chip in some way. But usually that results in a straight up dead CPU or barely functioning one. You'd be having major issues even getting it to boot if that were the case though. As far your thermal paste questions go, AS5 is a very good TIM & will work well for you. It is possible that a lack of TIM or a bad application of it is causing your excess heat if it is not just because you are using one of the super aggressive versions of P95. If you are using the TIM that came with your cooler, especially if it was pre-applied to the block a cleaning & fresh coat of AS5 definitely won't hurt any & will be a superior product to whatever is on your CPU now. The only other suggestion I can think of is to manually set your Vcore voltage if you are using "Auto" whether you have an OC set or not. I can't vouch for this 100% since I have ran my 6700K OCed from the start but I have heard that most Z170 mobos tend to give SL chips way too much voltage when set to "Auto" even at stock clocks. Leading to much higher temps than you would expect at stock settings. If you search through the intel cpu threads you can find a few posts about issues like this & I believe it is mentioned in the SL OCing guide too. Hope that info can help you some man! Edited by Rob27shred - 7/29/16 at 3:41pm