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Potentially the craziest 4790k issue youve heard of? Help me figure this out :(

post #1 of 6
Thread Starter 
So.. going to try to be as direct as possible. Already spent over half the week @ 12+ hours a day, and lost a few terabytes of data trying to sort this out.

I have ran the same overclocked config/settings on my watercooled pc for years now. It was built in late 2013. originally had a 4770k but upgraded to a 4790k. it has been prime95 24hr stable hitting 80c max during prime since the day I finished dialing it in to the .01 of a v. (spent weeks just on that, I'm anal!)

32gb memory
2 ssd for boot raid
2 hdd for data raid
2 1500w psus
4 gtx titans
z87 oc force

so we went through a major house remodel over the course of the last year and during that time I was being weened off of a lot of painkillers due to having stomach cancer in the past. I was pretty miserable and that left the pc to collect dust. (literally hadn't turned it on in at least 9 months)

I gave it a thorough disassembly and cleaning, and while I was at it - installed a new water pump as my old one had been going bad for awhile. (broke off the speed pot @ lowest speed setting ugh).

Upon all that and turning it back on all was well or so I thought. immediately began having some hitching issues and trouble booting. the debug led always froze at 15, or cycled to 15 and restarted and did that over and over. Eventually I could get into the bios upon it alerted me of a "boot failure" and thus began my process of elimination.

first I looked at my disks as I began using the marvell controller for an optical drive which used to use on the main intel controller due to planning to add another hdd soon. The marvell controller caused my hdd light to stay perma-lit and was the only change I had made during re assembly (apart from pump) so I started there. I flashed the firmware on it which was supposed to fix the hdd light issue and I had hoped the rest of it. No dice on either front. Disabled it completely and re configured my sata headers to the intel one and all was well with the hdd light now but the issues booting/posting remained.

During all of this not only did my boot record end up smoked (which prompted a fresh windows install eliminating that as the culprit as well) but I happened to touch one of my gpus and it was literally impossible to touch (due to heat). I thought oh, the fan must have died and its overheating and that's the issue! So I went through each and every card and all fans were working. (turns out after windows install I forgot to install afterburner and due to custom bios the fans were running low while card was perma oc'd n getting toasty) completely unrelated.

I next moved onto the bios itself. Even though the one I was using was fine for years, I figured hey, maybe it became corrupt. Tried 4 of them, finally settled back on the original as none of them made an iota of difference.

I moved onto the cpu thinking the IMC was going bad due to the 1.35v that had been pumped through it for years but via intel cpu diagnostics all tests passed with flying colors including IMC.

I then moved onto the ram. Here I thought I found my issue for a short while. I ran memtest and failed. At this point I started doing stick by stick tests but they all passed. After all the expected combinations it turned out I was okay if I used 2 sticks, but not 3 or 4. Of those 2 sticks they had to be in 2 specific slots (the orange) anything in the black slots resulted in fail.

At this point I assumed it was the motherboard itself. I checked my gigabyte RMA warranty status and wouldn't ya know it - I'm good until August! So I began coming to terms with the idea of having to do an RMA and being without a pc even longer.

Frustrated, disappointed, exhausted. I decided to try one more bios flash and make an attempt at finding out if one of the dozens of custom bios settings were the culprit. So I flashed to a modded bios. It caused the optimized defaults to load and for the first time, booted straight into windows!!

Now my interest is piqued. A few restarts, a few shutdowns, still going into windows with no hitching or anything. I began putting my settings back to pre-issue orientation and every time, page at a time, into windows - no issue!

So I get to the last page, basically advanced cpu clock settings. (mind you id already tried adding voltage to just about everything with no change) and make all the changes for that page. BAM - issue is back. So now I go through the page one by one.. CPU clock back to 4.8, uncore back to 4.5, ram back to 2200, ram timings back, all voltages back to where they were... Still working.

The very last damned thing I tried to return to where I had previously, and the punchline/oddest of all...

Turbo core?! wut!? I always ran with it disabled. My chip ran at 4.8 across the board, all the time.

If I turn the cpu and uncore down to 4.0 - gg no problem. Turn off turbo core and POOF no post stuck at debug 15 or endless reboot... lol.

What on earth? What is the cause hardware wise? How does having turbo core off suddenly cause my pc to nosedive yet having it on and no issues? I can even turn turbo core up to 4.8 (my overclock level) and it still works fine and I just got done running prime lol.

The single issue is whether turbo core is enabled or disabled.

Help me out here guys - I'm losing my mind on this one!!

Sorry for the book I said I was going to be direct, but I wanted to be thorough I guess to show how ridiculous this is/has been and save from redundant suggestions.

pre-thanks for reading it all and hopefully having some info or suggestions tongue.gif
post #2 of 6
What is this 'Turbo Core' is this actually a setting in the Gigabyte Z87 BIOS? You are supposed to have Turbo boost always enabled. If you can overclock past the stock clock speed then turbo boost is enabled. You need turbo boost to be enabled to overclock your CPU anyway.
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post #3 of 6
Have you re-seated the CPU in the socket? One of your memory channels is not working as intended.
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post #4 of 6
I agree. It is possible the pressure on the socket has changed due to changing the water cooling setup. I would reseat and reapply the heatsink compound during reassembly of the WC setup.
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post #5 of 6
Quote:
Originally Posted by Quantum Reality View Post

I agree. It is possible the pressure on the socket has changed due to changing the water cooling setup. I would reseat and reapply the heatsink compound during reassembly of the WC setup.

Well, not so much the thermal compound, The CPU itself.

Under custom cooling the cpu can shift in the LGA carrier and pins may not be making contact. All you need to do is remove the block, unlatch the CPU retainer, and re-latch it.

LGA sockets can have some odd issues if you use high tension mounting brackets or if you over-tighten your cooler.
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post #6 of 6
Thread Starter 
Hey guys, I sort of found the issue.

Surprisingly enough - my chip was literally overheating at my overclocked settings before I could even boot into windows. I reseated the waterblock and am still having tons of issues but the memory channel is back to working and I can get into windows consistently now with no hangups.

other issues abound though - if you have experience with watercooling please help/look here. I'm burned out. My wife is burned out from holding back my 1y/o all day for days in a row. Ugh, all I wanna do is jam some games for the love of god tongue.gif

here is my new thread

http://www.overclock.net/t/1603696/exhausted-days-trying-to-figure-out-what-is-going-on-and-its-looking-like-temps
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