i5 2500k Voltage?

1. Add more VCORE first. See if the problem goes away. The QPI/VTT is the memory controller voltage, you shouldn't be needing to touch that at these clocks with the correct RAM settings form your memory set in BIOS. Best thing to do is to take it off auto and set it to a fixed figure 0.05v higher. That will be more than enough. You can do that for other voltages like the CPUPLL, DRAM and System Agent too.

2. When the CPU is unstable you will get all kinds of errors which are misdirected. Crashes at idle are to do with not enough vcore as the CPU goes to load up. More power needed! When the system is 'apparently stable' it can get confusing. It will pass somethings and fail randomly on others but because the system is still working (just) you'll get all kinds of messages saying "this application is not working properly" or similar. Actually the program is fine but the CPU isn't stable and caused the crashed.

It's probable that your memory error is the same thing if you step back and think about it. Auto effectively means overvolt in our world and if that is combined with sensible speed RAM then there should be no load on the IMC (integrated memory controller) but plenty of volts being supplied. So it makes sense to assume that the CPU is throwing a wobbly and blaming the memory. Try a few increments of VCORE first.

3. For 24/7 use stress testing to 80c as a good target.

4. Lastly remember when you watch videos like Tom's on overclocking that the figures he sets in BIOS will be slightly different because he is on the next generation CPU to you. VCORE is going to be a bit bigger on yours.
 
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update/
I have since been playing with my voltages trying to get an undervolt to begin with. With Turbo boost turned off I can run at 1.05 comfortably (Never tried anything lower to be honest), with a 20min test on OCCT. However with Turbo Enabled with AUTO Turbo I had it running on 1.075 for about 10 minutes before I BIOS'ed. My Clock speed was usually around 3411 with occasional leaps to 3612. I Then tried making Manual Turbo mode and BSOD'ed or Froze while booting. I then increased Core Voltage to 1.1 and made it into Windows only to crash quickly. Getting Dump files with error codes of x101, 1e, all which point to more vcore. Is my CPU part of the unlucky Silicone lottery? Or is there still hope for me to reach 4.5GHz comfortably on my 212 cooler?

Im not an expert but i would say set everything back to default, so clock speeds and voltages to auto, then go to OOCT and do the stress sets noting what voltages it runs at using CPU-Z, then basicly follow the tutorial and start again using the auto voltages to get an idea of what is safe voltages on stock.
 
@Master&Puppet
Thanks for the detailed reply. I appreciate it. Sorry for my late reply however haha.
But hmm. I ended up doing that regardless because I figured it would probably help anyways. But I had my RAM set up correctly I believe. When you say set the voltage 0.05v higher, do you mean for the ram itself? But I have yet to touch the others at the moment.
But hmm. That makes sense. At the moment I believe I have a stable 4.3GHz overclock, as its been stable for two days now without hiccups. Within the BIOS I have it set at 1.270v, and CPU-Z is telling me 1.288. Is this a fairly good voltage for 4.3?
But yes. I have come across 'auto' being 'overvolt' many times so far haha. But Im currently running Patriot G2 RAM. Not sure if this is 'sensible speed RAM', haha.
But hmm. Okay. I've still got a ways to go to the 80c mark so I guess i've just gotta keep pushing it more. :P
But oh? For whatever reason I thought he was running the same chip. But that makes sense.
Do you think it could also be my PSU that could be causing problems? Or when should I look into the PSU as being the problem? I have an old Mushkin 650w PSU at the moment...
Thanks again for your response! I appreciate the help.
 
Hey guys, Its been a while. Ive been stable at 4.3GHz at 1.285 (1.296 according to CPU-Z) for a little now, but I noticed that for example when im scrolling through youtube it freezes my computer for half a second? O.o
I ran an OCCT Test and Core #0 sometimes spikes to 81' celcius and stays there.
Real Temp however disagrees with that number.
On OCCT as well, I saw a spike in CPUTIN briefly to 127'. O.O What? haha.
Whats going on with my Processor? O.o
Could it be my powersupply as I mentioned in my previous post a while ago?
Thanks again for the help!

The only thing I could think of is if the newer version of OCCT is buggy? Anyone have any suggestions?
Thanks!

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EDIT
I ran OCCT Tests today and they came out perfect? O.o
Temps of 55,58,58,56 on cores 0-3 respectively.
But heres a video showing my Freezing situation. I had music in the background on so you could actually hear the freeze itself. This freeze occurs sometimes when closing tabs / scrolling through youtube videos (as shown). Any idea what the cause of this could be guys? PSU? Early signs of needing more VCore?
Thanks guys
http://www.youtube.com/watch?v=pHjbZSNtJzY&feature=youtu.be
 
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Just caught this thread. Just my two cents based on a similar sounding glitch I have gotten on my laptop, but to me that sounds like something is being starved of voltage and the computer is making an attempt to recover it's bearings. it also happens under certain severe video processing scenarios (see also: gaming), but unless I underclock my GPU then I get a BSOD that is telling me that there is voltage interruption to the GPU. Underclocking seems to correct it in my case on account of me not being able to increase voltage to the GPU without a hacked BIOS (which I don't like), so it kind of sounds to me like you may want just a smidgen more VCore. That's kind of typical with some overclocks tho, after a brief period of time you may wind up needing just a tad more to get everything up to snuff again. I wouldn't increase it by much more than .01V at a time at your current voltage levels, however. I PERSONALLY don't like going over 1.35V with even Sandy Bridge (bad personal experience).
 
@Mgutierrez33
Thanks for the reply.
My CPU is still running cool though. Like under 60 degrees after 15minutes of OCCT LINPACK. So thats why im not REALLY concerned about the Voltage. But thats fair to say. I want to see how much higher I can go while staying under 75 degrees but Id have to be pushing a lot more voltage. Which is kind of scary =P
Ill try pushing more Voltage in it for sure. But the weird thing. Today its not doing it. O.o And under gaming its fine. Who knows?
 
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