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Ok, so is your bios temp pooched or something? You had been quoting that 23o C IDLE ambient in the build thread but that was info from your bios. I thought that seemed insanely low at the time...
Which P95 tests are you running?
If you're stable on small FFTs, and stable at high on LinX, then there's a good chance that your RAM is the culprit. Or, it could simply be because it takes more time for the errors to show up.
Use a program called HCI Memtest to stress your RAM and test for stability.
As is said plenty of times in plenty of reviews, the H100 is a good cooler, but its not anywhere near a true custom loop (which costs quite a bit more). A big portion of your limit here could very well be your ambient though - if your inside temp around your case is truly 30-35C (~90+F - I don't how you stand that in your house, high 70s is borderline intolerable for me inside), then you're dealing with a deficit to overcome to start with.
Yes, I made a mistake there. I don't know why the BIOS gives a different number.
With that case, if you're planning on sticking to CPU only, I would recommend getting the XSPC Rasa RX240 kit. Should cost you somewhere around $150, and come with everything you need besides distilled water.
RAM is notorious for being DOA, but just barely that it isn't noticeable in day to day usage. When you really start stressing it, then you'll notice the occasional error that might or might not lead to a blue screen.
So what were your idles in hwmonitor? I'm starting to think I need to reset my H100. Anything over 1.4v sends my chip to 80c or so. Even at 1.35 I'm in the mid to high 70's under IBT.
Then again, I only have the two stock Corsair fans on my H100... I've been meaning to get 4 better fans for a push/pull setup.
I'm not sure there has been a side to side comparison of the XSPC kit against the H100, but it is certain that it is better. The waterblock is better, and the radiator is much better.
The reason why I didn't recommend the H20-320 EDGE HD is because you cannot fit a 360 radiator internally without modding. It's also significantly more expensive than the Rasa kits.
As for the differences, the Apogee HD block is better than the Rasa block. Radiator is arguable, and depends on the fans you're running. The XSPC radiators tend to have better finish and quality from what I've heard as compared to Swiftech. It's a low FPI, thick radiator, meaning it excels in low fan speed operations. The Swiftech is a medium FPI, thin radiator, so it does better in the higher RPM ranges. The MCP355 used in the Swiftech kit is better than the 750 pump in the Rasa kit, but as long as you stick to CPU only, the 750 pump is more than sufficient.
The RS240 kit uses a thinner radiator (the RS series radiator) that does not cool as well as the RX radiator. It's cooling capacity is approximately 50-70% that of the RX radiator with the same fans.
Which external coolers are you talking about? There are several different ways to make a water cooling system external. A Swiftech Radbox (or similar), which hangs the radiator off the back of your case. A Koolance system, extremely overpriced and requires modding to the top of your case. Radiator stands, which allows you to place the radiators away from your computer. And then there's always the custom modding setups.
Watercooling is always the best way to achieve performance, besides extreme sub-ambient cooling systems.
More radiators = better cooling for less noise. If you really want to go all out, go make a new post in the watercooling subforum with your budget limit, and I can guarantee you we can make you a system that will use up your entire budget.
Pretty sure $500 for a custom XSPC cpu watercooling setup is more than sufficient to add on plenty of blingIt can start under $200 for the XSPC kits to infinity for a massive custom loop with all the bling. That's why budget is important. Also, whether or not aesthetics is important to you is another factor.