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post #11 of 33
Thread Starter 
Quote:
Originally Posted by justarealguy View Post
Sandy Bridge has been out since January '11. There are countless 2500k owners who will vouch for their stability and speed. The only issue was the motherboard SATA controller failures which were resolved in the B3 revision.

With SB you have two options for overclocking: 2500k and 2600k. They're identical apart from stock clocks, slightly more cache on the 2600k and hyperthreading.

If you don't need the cache, HT then go with the 2500k.
I dont really need the cache, so do you think i should just stick with the 2500k? and how far do you think i could push it using liquid cooling (i havent picked what kind yet but i know ill be going liquid).
    
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post #12 of 33
Thread Starter 
Quote:
Originally Posted by robwadeson View Post
i5-2500k and a p67 chipset mobo.
Sounds good. ummm you have your tag as "intel overclocker"...but isnt athlon an amd cpu??
    
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post #13 of 33
Quote:
Originally Posted by RhysLadhani View Post
I dont really need the cache, so do you think i should just stick with the 2500k? and how far do you think i could push it using liquid cooling (i havent picked what kind yet but i know ill be going liquid).
Sandy Bridge processors arguably have no real need for liquid cooling. Here's a quote from a review on these puppies:

Quote:
Another critical point in overclocking Sandy Bridge is that all K-series chips have a multiplier wall. Previous generation Intel CPUs responded to increased voltage and lower temperatures to achieve higher clock speeds. That is no longer the case. A chip has a maximum multiplier it will achieve; additional voltage or lower temperatures will not improve the results. As mentioned, there is currently D1 and D2 stepping, and the D1 is preferred. Each chip will have an inherently different multiplier wall. Essentially this means that voltage, temperatures, and motherboard model will not make a difference in the maximum overclock of a particular chip; it all depends on the chip now.

Therefore, this also means that sub-zero cooling with dry ice or liquid nitrogen will no longer help improve overclocking results. In fact, Sandy Bridge chips will downclock and will lose performance scaling when very low temperatures are applied. As a result, air cooling is all that's really necessary to hit the maximum overclock on a particular chip. Water cooling will help keep load temperatures lower, but will not produce a higher multiplier. We've learned that probably 90% of processors (at this point in time, at least) will have a multiplier wall that will limit overclocking to 4.4 - 4.7GHz. Processors with 50+ multipliers that produce speeds between 4.8 - 5.0GHz are rare (so far), and we're not sure if that will change as the D1 Stepping hopefully becomes more common.
So, despite having an unlocked K-series CPU, you may reach the maximum multiplier regardless of the cooling used or voltage applied. There is a bit of wiggle room to tweak the BLCK to squeeze a bit more out of a chip to hit the magical 5GHz if you have a cherry chip to begin with, but the days of juicing up a cheap chip to insane speeds are pretty much over.
Source
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post #14 of 33
Thread Starter 
Quote:
Originally Posted by justarealguy View Post
Sandy Bridge processors arguably have no real need for liquid cooling. Here's a quote from a review on these puppies:



Source
hmmm, thats interesting. So what happens with the temps? when u OC do they go up like normal or what? i dont understand how just aircooling keeps em from burning.
    
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post #15 of 33
It's 100% up to the chip regarding how high it will overclock. If your chip has a multiplier wall of 48x, then you will never get past 4.8GHz. I'm lucky and have a chip that will do 56x, but I run at 4.8GHz due to temps/voltage. If I had a nice water cooling solution, I would be more apt to run it at 5.0-5.1GHz instead.

Avoid 2600K unless you really need hyper threading. It costs you ~$100 more and increases temps by a fair amount. No reason to pay ~$100 more for a 2600K just to disable HT to lower temps/voltage to get higher speeds, just get the 2500K instead.

If you're not afraid to push it, try your luck at a 2500K. Should be able to hit 5GHz at ~1.45V and reasonable temps. No less than Silver Arrow/D14/H70-grade for cooling. To keep temps in check for ~5GHz, water cooling should really be considered instead. For 4.8Ghz and lower a ~$30 Hyper 212+ cooler would suffice.
Edited by compudaze - 4/9/11 at 11:43pm
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post #16 of 33
Quote:
Originally Posted by RhysLadhani View Post
hmmm, thats interesting. So what happens with the temps? when u OC do they go up like normal or what? i dont understand how just aircooling keeps em from burning.
I don't quite understand what it is that you're asking. We're not cooling a nuclear reactor here, it's 100-140watts of power that needs to be dissipated.

Chips produce more heat when clocked higher, this increases linearly. They produce more heat when voltage is applied, this happens exponentially.

None if this is any news. The real issue is that reduction in operating temperatures has not shown to increase attainable clocks in SB chips.
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post #17 of 33
Quote:
Originally Posted by justarealguy View Post
Sandy Bridge processors arguably have no real need for liquid cooling. Here's a quote from a review on these puppies:



Source
Heat is a CPU's worst enemy. IMO liquid cooling is essential to keep temps at a reasonable level for 5+GHz and 1.45V+ on Sandy Bridge.

What the article is saying is that no amount of cooling will get you over the CPU's multiplier wall if you get unlucky with the chip having a low multiplier.
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post #18 of 33
Quote:
Originally Posted by compudaze View Post
Heat is a CPU's worst enemy. IMO liquid cooling is essential to keep temps at a reasonable level for 5+GHz and 1.45V+.

What the article is saying is that no amount of cooling will get you over the CPU's multiplier wall if you get unlucky with the chip having a low multiplier.
Indeed. If you prefer lower temperatures to give you more headroom to apply voltages, then go for water.

General overclocking has no real need for a crazy setup though - I'm on air running 52c @ 100% load.
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post #19 of 33
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okay i wanna thank all of you because your last 3 messages answered my question. i was just wondering what u meant. the article made me think that the cpu had some new temp control, because u said that its all based on multipliers now instead of temps and voltages. Compudaze, which cpu do you have and how much was it? and what do all of you think about the corsair h50? is it true that its only as cool as the temps in the room, because there is no cooling compound, just water? my friend recommended it but his temps go up to 72c at full load after an hour, and hes still at a stock clockrate on his i7 930. id like to keep mine around 55c at full load around 4.9ghz-5.2ghz. i dont think ill push it much further than that.
    
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post #20 of 33
Quote:
Originally Posted by RhysLadhani View Post
okay i wanna thank all of you because your last 3 messages answered my question. i was just wondering what u meant. the article made me think that the cpu had some new temp control, because u said that its all based on multipliers now instead of temps and voltages. Compudaze, which cpu do you have and how much was it? and what do all of you think about the corsair h50? is it true that its only as cool as the temps in the room, because there is no cooling compound, just water? my friend recommended it but his temps go up to 72c at full load after an hour, and hes still at a stock clockrate on his i7 930. id like to keep mine around 55c at full load around 4.9ghz-5.2ghz. i dont think ill push it much further than that.
Liquid cooling / air cooling will never get you below ambient temperatures. You have to understand that the goal with these systems are to take the heat of the processor and whisk it away to be disspiated to the rest of the room.

To get 4.9-5.2 you'll need to get lucky with your chip firstly, secondly you may need more cooling than a h50 to disspiate a chip at 5GHz.
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