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Good CPU cooler to overclock 2500K to over 5.0GHz? - Page 4

post #31 of 52
Quote:
Originally Posted by Bountysky View Post
I heard that for a happy Sandy Bridge long-term overclock:
1.) Keep peak Prime95 core temps below 75ºC
2.) Keep the CPU voltage below 1.4v

What are the chances of my 2500K going above 70ºC if I crank the voltage to 1.4v?

Is Hyper 212+ just not good enough to overclock 2500K in the "safe range"?

I don't want to end up with a CPU lasting only 2 years. So I want to OC 2500K in the "safe range".
There's no safe range. Overclocking is a risk you take in order to get better performance in the short term. The CPUs have only been on the market since January this year, there's no way to know how long they'll last at our OCs. Maybe 50% will start dying in 3 months, maybe we'll learn that they can accept 1.6 V 24/7 for years. Everyone is saying "based on my experience with this and this CPU, I think the 2500K will do x V 24/7" and they all hope they're right.

That said, if you want to stay in the "safe range" you defined, you'd need something better than a Hyper 212+. I'm fairly sure my 2500K can hit 75 C in Prime at my current OC (which is coincidentally at 1.4 V) and I'm using a significantly better cooler than the Hyper 212+.

Unless you get water cooling or a top-end air cooler (NH-D14 or Silver Arrow) I'd say the chances of going above 70 C at those speeds & voltages are near 100%.
Edited by B!0HaZard - 10/12/11 at 5:33pm
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post #32 of 52
Thread Starter 
I see, thanks. BTW that guildeline actually came from Intel if that matters. But yeah sounds like I probably need a better CPU Cooler than Hyper 212+ especially since I live in Australia where it gets hot as 32+ degrees in summer.
post #33 of 52
Quote:
Originally Posted by Bountysky View Post
I'm currently building a Gaming Rig optimized for Starcraft 2. I'm going to use a single monitor in 1920x1080 resolution. Majority of the time, I will be playing Sc2, DotA 2 and HoN . I will also try out these games; LoL, Skyrim, Dragon Age II, GW 2, Tera, WoW and Diablo III.

Is Hyper 212 Plus good enough to overclock over 4.5GHz or do I need a noctua nh-d14?
Once DotA 2 comes out, there will be no need for LoL

But to answer the question, the 212+ will be solid up to 4.5 unless you live somewhere that demands more. Getting to that magic 5 will definitely need more. If you are willing to pay for it, an H100 would suffice if you have a good chip.
Edited by zackadavis - 10/12/11 at 7:00pm
    
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post #34 of 52
Quote:
Originally Posted by Bountysky View Post
I see, thanks. BTW that guildeline actually came from Intel if that matters. But yeah sounds like I probably need a better CPU Cooler than Hyper 212+ especially since I live in Australia where it gets hot as 32+ degrees in summer.
32 C? Water cooling is the only way to stay below 70 C in Prime then. Not that Prime temp is relevant, your CPU will be 5-10 C cooler with normal use. I personally think Prime temps of up to 80 C are fine.

And Intel isn't to be trusted. Conflict of interests and lack of knowledge. When we believe manufacturers, we're sometimes punished (see MSI's 4-phase AMD motherboards with 125W CPUs).
Edited by B!0HaZard - 10/13/11 at 3:55am
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post #35 of 52
I'd even say 4.5 on a 212+ is pushing it, especially with high ambient temps. There are better coolers for not THAT much more which will push the chip further.

Also keep in mind - and maybe this has already been mentioned - but I believe the statistic is only 5-10% of i5-2500k's are even capable of 5GHz+ .. people see others doing 5GHz+ overclocks and assume ANY 2500k can do it.

1. Trial and error
2. Be happy if you even get up to 4.8 - that last couple of hundred megahertz per core isn't a difference you'd be able to tell in realworld usage anyway.

Honestly the i5-2500k and i7-2600k even at stock already put us at the point where its more CPU than most of us can take advantage of in our daily tasks based on current software. In general software development has really fallen behind when it comes to leveraging multithreading. Excepting things like media encoding or rendering, it seems like its become ever more difficult to find software that will actually max a CPU out. And that's especially true with current games, which are far more GPU intensive than CPU intensive. You're lucky to see most games break 50% utilization on all cores during gameplay these days.
post #36 of 52
Quote:
Originally Posted by B!0HaZard View Post
And Intel isn't to be trusted. Conflict of interests and lack of knowledge.
Very accurate statement, especially the conflict of interests part. The words between the lines from Intel are "you asked for unlocked multipliers and you got them, do amazing things. just not too amazing. we've got a new refresh coming up and dont want to cannibalize sales."
post #37 of 52
4.5GHz with 212+ is nothing. Think max I hit during Prime was 70C, keep in mind normal usage will never see these temps. A better air cooler will not guarantee pushing the chip further, especially when it gets to the point where you need a lot more Vcore to raise the multi by 1.
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post #38 of 52
I have this MSI P67-GD65 motherboard at work. I've had it since January. At the time I bought a 2600K, which I still use and it can be clocked to 5,426GHz, ofcourse it needs some voltage to do it (1.635v to bench).

In july I bought 3 new CPU's for other computers in the office. I tried them all in the motherboard. 2 of them booted fine to windows at 5.4Ghz, before getting the curser, and the last one booted fine to windows at 5.5Ghz.

One of the employee got the 5.5Ghz with him home and toasted it. He knows a bit about computers so I think he tried a little to hard to get it to 5.8Ghz. He said something about 1.74v and high LLC.... and that can actually give it up to 1.9v. (danger zone)

What I want to tell you is that you can clock most of these CPUs to at least 5.4GHz, if you know the tricks, and I am pretty sure that you wont see any problems, if you keep vcore around 1.52v.

A good thing, for your safety, about sandy bridge is that you can adjust frequency in relation to load on cores. Your CPU might be very hungry for vcore at 4x5.3GHz, so what you do is actually to make sure that it only do 5.3GHz when only one or two cores are active. That way you can reduce your manually set vcore.

Like 5.3Ghz, 5.2Ghz, 5.2GHz, 5.1Ghz @ vcore at 1.5v

One core active, will get 5.3GHz stable
Two cores active will get 5.2GHz stable
Three cores active will get 5.2GHz stable
Four cores active will get 5.1GHz stable

Where normal old'days overclocking would be 4x 5.3GHz and require you to set your vcore at 1.6v, which is fine but will require a bit more cooling.

Further more it is easy to get it stable with with turbo boost and EIST on SB and it will end up giving you a cooler CPU and great power-bill reduction.


About cooler,
If you go air, be sure your case and fans can feed it with a good fresh cold air. Many people seems to buy IMBA coolers, but suffers from lack of ventilation. Read about ATX formfactor and buy a lot of fans to push air inside from the lower front, and pump air outside in the upper back.

I have done plenty of benchmarking at 5.4GHz, 2xGTX470 (stock cooling) with a simple Prolimatech Megahalem rev. B, siverstone FM121 in push/pull on it. Screenshot attached below.


Edited by qwwwizx - 10/13/11 at 5:02am
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post #39 of 52
Screenshot is broken, but I agree that people underestimate SB. A lot of people don't know how to OC, don't want to pass a certain Vcore, don't have an MB that can do it, etc. You'd be surprised how often people forget Internal PLL Overvoltage or set their memory speeds wrong.
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post #40 of 52
For air cooling I think you should consider the Scythe Mugen 2. I own it and it keeps my PC very cool with a healthy overclock. If you look at various benchmarks, it consistently comes out on top.
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