i5 6600k overclocking issue(s)?

[Troika]

So, I just acquired a i5 6600k for $160 out of one of the demos at work (it was originally listed at $200 on clearance), a Asus Maximus VIII Hero/Whetstone for $68 off of an ebay auction and 16GB of Corsair Vengeance LPX 3000mhz for $140. I was playing around with the settings and I was using the TPU II overclocking setting and was able to get 4.4Ghz with fantastic temps (42~44C depending on the core) under load but when I try to get it higher on my own, I'm getting bizarre issues. I have it set to 4.6Ghz on all cores with 1.35V. I thought that was a good conservative number since most seem to say 1.4V is as high as you'd be able to safely go before temps are an issue. Well, that's exactly the issue and I can't understand why. I've delidded and applied conductonaut under the IHS and between it and the coldplate of the cooler I'm using, which is a Corsair H110i GTX, so I expected temps to be pretty low. Under prime95, temps quickly spike to 100C on core #2 and 86C on core #0 and clock speed drops from 4.6ghz to 2.8Ghz. Cores #1 and #3 sit at 60C.

As a reference, I previously has a Sabertooth 990FX R2.0 with a Phenom II x6 1090T with the same cooler and the temps were pretty good. The 1090T was oc'd to 4.2Ghz with 1.55V and it was peaking at 44~46C depending on the core. I thought temps would be lower since the voltage would be a bit lower but I feel like something is wrong, maybe some setting I toggled by accident or perhaps the cooler isn't sitting correctly, which is odd since when I had TPU II enabled, temps weren't an issue. I'm still going to check everything, maybe reseat the coldplate or check the IHS to see if shifted for some reason when I put the cooler on but I think its a setting. THe Maximus VIII's bios UI doesn't seem to be as easy to get around as my previous Sabertooth board or even any of the Gigabyte boards I've used before so I think its a pretty good chance that I've toggled something incorrectly.

Anyways, here's my complete system specs.
Motherboard: Asus Maximus VIII Hero
CPU: Intel i5 6600k (delidded and liquid metaled)
Cooler: Corsair H110i GTX (Adjusted for more aggressive performance fan profile)
Ram: 16GB (2x8GB) Corsair Vengeance LPX DDR4-3000 (1.35V, Latency 15-17-17-35)
GPU: 2xEVGA Geforce GTX 780 3GB w/reference cooler (Liquid metaled. +180Mhz core, +300Mhz memory, custom fan profile)
SSD: Mushkin Chronos 240GB
HDD: 2x Seagate Barracuda 1TB (in raid 0)
ODD: Asus DRW-21B1ST
PSU: Corsair RMx 1000w
Intake Fans: 200mm Bitfenix Spectre (front), 2x140mm Cooler Master R4-S4S-10AK-GP (side panel)
Exhaust Fants: 140mm Phanteks PH-F140SP (Rear), 2x140mm Corsair SP140L (top on radiator)
Other Fans: 120mm Scythe Slipstream (Mounted on drive cage for added airflow to the gpus)

My goal is just to get to 4.6Ghz, which seems to be like a fairly realistic goal to have with a 6600k, 4.8Ghz+ would be nice but I'd rather not push too hard since this'll be my daily driver for a while and I'd rather not have to change parts again, for a year at least.

[Jurrunio]

maybe the pump speed and radiator fan speed isnt keeping up?

[LIGISTX]

Could be a bad delid. If you put to much paste in there and its not making good contact with the IHS, or if you resealed the IHS it could be lifting it off the die itself. When I delid my 4700k, I used liquid metal, and the slightest amount of red RTV to reseal it, and just sealed it with the pressure of the mobo's CPU retention bracket

 

I saw 15-20c temp drops.... same exact everything else, except my fans speeds DECREASED since the temps went down lol. I went from ~1000 rpm to ~850 rpm on the same cooling loop in my sig, and I dropped 15-20c on every core! So, I am not sure if conductonaut is enough for a die to IHS TIM, like I said I used liquid metal, and it could be a poor application or a bad re-seal.

[LIGISTX]

just to see what I am tlaking about when I did my 4770k.... this was at 4.2 GHz IIRC

 

[LIGISTX]

I guess my RPM's where a bit off, this was over a year ago. Ambient was 77f in both cases, or 25c.

 

[Troika]

1 hour ago, Jurrunio said:

maybe the pump speed and radiator fan speed isnt keeping up?

The fans and pumps should be maxed by 60C, which unless my ears aren't functioning correctly, they are maxed during prime95.

 

1 hour ago, {EAC} Shoot em UP said:

Could be a bad delid. If you put to much paste in there and its not making good contact with the IHS, or if you resealed the IHS it could be lifting it off the die itself. When I delid my 4700k, I used liquid metal, and the slightest amount of red RTV to reseal it, and just sealed it with the pressure of the mobo's CPU retention bracket

 

I saw 15-20c temp drops.... same exact everything else, except my fans speeds DECREASED since the temps went down lol. I went from ~1000 rpm to ~850 rpm on the same cooling loop in my sig, and I dropped 15-20c on every core! So, I am not sure if conductonaut is enough for a die to IHS TIM, like I said I used liquid metal, and it could be a poor application or a bad re-seal.

You may be right, I don't reseal but I didn't remove the silicone adhesive, which is likely uneven now. I did remove the adhesive on my 8700k on my laptop plus I'm using a aftermarket IHS (from Rockit cool) and temps there hit about 62C max. I think it is that since the 8700k is a much hotter chip. I'll probably just keep using the TPUII setting for now and go double check my work tomorrow since I'm moving things about in my room so I don't exactly have a good work surface and I don't like the idea of working on carpet.

[LIGISTX]

1 minute ago, Troika said:

The fans and pumps should be maxed by 60C, which unless my ears aren't functioning correctly, they are maxed during prime95.

 

You may be right, I don't reseal but I didn't remove the silicone adhesive, which is likely uneven now. I did remove the adhesive on my 8700k on my laptop plus I'm using a aftermarket IHS (from Rockit cool) and temps there hit about 62C max. I think it is that since the 8700k is a much hotter chip. I'll probably just keep using the TPUII setting for now and go double check my work tomorrow since I'm moving things about in my room so I don't exactly have a good work surface and I don't like the idea of working on carpet.

Yea, definitely remove the old adhesive. I ordered some plastic razor blades from amazon and they worked out great. Didn't want to damage the CPU's substrate... The IHS isn't a big issue, unless you gouge it with a metal scraper, but the CPU substrate is an issue.

 

I used these

[Troika]

2 hours ago, {EAC} Shoot em UP said:

Yea, definitely remove the old adhesive. I ordered some plastic razor blades from amazon and they worked out great. Didn't want to damage the CPU's substrate... The IHS isn't a big issue, unless you gouge it with a metal scraper, but the CPU substrate is an issue.

 

I used these

I used the plastic picks that came with my iFixit kit, temps are now where I expected, if only slightly higher. 41~43C at 4.4Ghz and 1.33V. Its been a while since I used a Intel chip in a desktop but I guess its as good as it'll get on my cooler. Its hell of a lot better than 100C  I'll work on getting my OC higher, for now, TPU II is working very well.