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2500K: Ok to set different multi's for different cores?

post #1 of 13
Thread Starter 
During my OC attempt on this chip, I'm finding that my 4th core is running hotter than the other 3 (which I've been told is pretty normal). I ran Prime95 for 36 hours, and the 4th core gave out at the 33 hour mark (don't think it was due to overheating, though, since the max temp read was 78). I had the multi set to 42 for all cores.

I was wondering if it would be ok to change the multi to be set per core, leave the first 3 cores at a multi of 42, and bring the multi for the 4th core down to 41, or maybe even 40. I'm assuming this should be ok, otherwise why would there even be that option? But I figured I'd check and see what you guys think, in case if certain programs might expect all 4 cores running at the same speed, or some other reason why it wouldn't be such a good idea.

I have the vcore set at 1.2v, and would rather not increase that due to the fact that I'm already getting pretty high temps on this chip (probably due to my cooler).

Thanks in advance for the info
post #2 of 13
If your overheating to 78 degrees Celsius at such a low overclock I would suggest getting an aftermarket cooler before anything else. I'm at 4.7Ghz and my max temp was 68 degrees Celsius, and that was after hours of Prime95 which eventually warmed my room, if I kept it cool I doubt I would even hit 68 again. About how safe it is, I'm not sure.
post #3 of 13
Stock cooler is garbage (if you are using it). You MUST upgrade your CPU cooler if you're going to OC this chip. It runs warm at stock (3.3) on the stock cooler.
    
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post #4 of 13
Quote:
OCZ Vendetta 2 w/ Scythe Katana 2000RPM fan
How are you applying the thermal compound to your cooler?
Edited by retrogreq - 8/21/11 at 8:11am
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post #5 of 13
Thread Starter 
Actually, I am using an aftermarket cooler. I'm using an OCZ Vendetta 2, which is actually an LGA775 HSF, but I modified the holes in the legs using a dremel so it would fit... probably isn't having as good of contact as it needs, so I'll do an adjustment... or worst case scenario, I also just picked up a Cooler Master Hyper 212+, but I'd rather use that for my AMD computer, and salvage my Vendetta 2 if possible (because, come the F on! What is this BS with needing a new HSF for a new socket type? That's just overdoing it with the proprietary nonsense).

But can anyone answer the actual question, please?
post #6 of 13
Thread Starter 
No longer need a response. Reseated the HSF after a bit of an adjustment, and dialed the multi back to 41 on all cores, and temps are lower.
post #7 of 13
hmm just reading this, im not sure how that would work doing it differently on different cores...I have the option in my bios to do it by each core or by all, the only difference being that you can adjust the multiplier in ASUS AI Suite in windows, and wit hthe other setting you cant change it in windows.

As for your p95 attempt, Majority of people consider 12 hours to be enough to consider a system stable, not sure how long you were planning on going for but 30 hours is prob more than is needed. Dont be dishearted because your cpu failed after that long, Personally i would settle for 12 hours stable.

Quote:
Originally Posted by DJRK View Post
Actually, I am using an aftermarket cooler. I'm using an OCZ Vendetta 2, which is actually an LGA775 HSF, but I modified the holes in the legs using a dremel so it would fit... probably isn't having as good of contact as it needs, so I'll do an adjustment... or worst case scenario, I also just picked up a Cooler Master Hyper 212+, but I'd rather use that for my AMD computer, and salvage my Vendetta 2 if possible (because, come the F on! What is this BS with needing a new HSF for a new socket type? That's just overdoing it with the proprietary nonsense)
Well Im not been funny, but frankly 78C with 1.2v is shocking and will almost certainly limit your overclock if you want to take it further. What would be the issue in going out and buying a half decent air cooler like a noctua d14 or prolimatech megahalem?

There not expensive, and my megahalem keeps my 1.4v 4.8ghz 2500k under 60C while folding, and under 70C during p95 testing!
Edited by $ilent - 8/21/11 at 3:17pm
post #8 of 13
If your hitting 78c at vcore 1.2 on a 4.2 overclock then you really need to reseat the cooler and if you have better tim that will be a +.

What are your ambients?

EDIT: a little late!
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post #9 of 13
Thread Starter 
Quote:
Originally Posted by $ilent View Post
Well Im not been funny, but frankly 78C with 1.2v is shocking and will almost certainly limit your overclock if you want to take it further. What would be the issue in going out and buying a half decent air cooler like a noctua d14 or prolimatech megahalem?

There not expensive, and my megahalem keeps my 1.4v 4.8ghz 2500k under 60C while folding, and under 70C during p95 testing!
Well, for starters, I was using that cooler VERY effectively for my last Intel E6600 OC rig. I paid top dollar for that within the past 2-3 years ago. I recently upgraded to an AMD CPU/mobo, and was first surprised to find out that I couldn't reuse it there, but I was at least somewhat understanding since it was a different CPU manufacturer, and thinking this proprietary BS only went as far as that. But then, low and behold, I learned that I couldn't use it again in this build, the next generation of Intel, neither. But what's worse is that it was a matter of them simply spacing the holes a difference of a couple bloody millimeters apart! That's just a slap to the face. Heck, you couldn't even tell it wouldn't fit simply by looking at it (like you could with the difference between the Intel/AMD holes), I only found out after trying (and failing) to install the cooler onto the mobo.

Can you give me one good reason why we couldn't have universal HSF's (even for both Intel and AMD)? Are they not just big slabs of metal (ok, I'm obviously generalizing here), that have no mechanical movement, nor any unique functionality: they all transfer heat from a flat CPU die/heatspreader, that are nearly all generally about the same size, shape, and height (and I'm sure would take next to no effort to keep them the same size unless there's a significant technological breakthrough). I know proprietary stuff exists EVERYWHERE, but a HSF is so BASIC that it's nothing more than an absolute cash grab. What's next? Cases specifically for AMD/Intel mobos (actually, that's not too far fetched, and may already exist)? Maybe proprietary screws?

Also, the reason I didn't want to spend money on another cooler is because I built this computer for someone else (and was paid to do so), and not realizing this proprietary nonsense, I planned on selling them the HSF to increase my profit margin/recoup my cost of having to get a replacement cooler for my AMD rig... so when I realized that didn't work simply because they only made the holes a little further apart, you're darn right I was going to do everything in my power to make it work. Sure, I was at fault for not doing my research, but that was because I had a logical thought of a company shouldn't change something that didn't need to be changed. Anyways, I hate to say it, but sure, the modified cooler might not work as well as a new one (or as well as it's darn well capable of, but can't because it was made "obsolete"), but it did the trick well enough to get some overclocking done, so I'm not going to lose any sleep over the situation.

Also, I just want to say that my hostility in my response isn't directly towards you, just the situation.

Quote:
Originally Posted by FREELINE57 View Post
If your hitting 78c at vcore 1.2 on a 4.2 overclock then you really need to reseat the cooler and if you have better tim that will be a +.

What are your ambients?

EDIT: a little late!
I was using Arctic Cooling MX2 TIM. Certainly no longer the best of the best, but it was one of the best not too long ago. My method of applying it is to put a line of it across one end of the CPU heatspreader, and to use a razor blade to spread it across the entire surface so it's just a nice, thin layer.

Unfortunately I don't know how to determine what my ambients are... I'm in an air conditioned bachelor apartment, where I have my air conditioner set usually from 20-24 degrees.

Anyways, the owner came to pick up the computer today, so most of this is moot at this point, but I wanted to reply to the above comments, and would still appreciate your guys feedback on the following question: Would you guys say that given the owner of the computer was happy with the overclock achieved (which he certainly was), that those temps/voltages/clock stability are fine & safe for everyday (primarily gaming) usage?

Finally, I just want to say that if anyone is thinking I'm in the wrong regarding usage of the modified cooler, that I've offered him full, on-going support, and since he surprisingly paid me more than double what I asked for my time/trouble, I'll have no problem replacing the cooler if need be (and if I knew he was paying me as much as he did, I would have just gone ahead and put in a new cooler in the first place... and unfortunately he does live in another nearby city, so it's not convenient to do so unless necessary). Hope that clears up any negative impression I may have made.
Edited by DJRK - 8/21/11 at 8:40pm
post #10 of 13
Hopefully you got that seated properly. The Vendetta should be producing way cooler temps than 78 at that overclock. That's almost no better than what the stock cooler can do.
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