Ivy Bridgy 3770 NON K Overclock

N

Nearsite

Gawd
Joined
Apr 21, 2006
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Hi everyone,

I'm hoping you guys can help me decide which CPU to purchase. I'm wondering how much the 3770 non K will overclock to? What is it's maximum multiplier? I'm hoping to reach 4.0 to 4.2 on the non K version of the 3770.
 
It should be the same as Sandy Bridge, which was 4+ over the max turbo bin.

If Ivy Turbos like Sandy did, then that means it spends most of it's time fully-loaded at base speed + 100 MHz. With a base speed of 3.4 GHz, this puts the 3770 at max 3.5 GHz fully-loaded (max single-core is 3.9 GHz).

Bumping that 4 bins puts your max 4-core speed at 3.9 GHz, and your max single-thread turbo at 4.3 GHz.
 
defaultluser said:
It should be the same as Sandy Bridge, which was 4+ over the max turbo bin.

If Ivy Turbos like Sandy did, then that means it spends most of it's time fully-loaded at base speed + 100 MHz. With a base speed of 3.4 GHz, this puts the 3770 at max 3.5 GHz fully-loaded (max single-core is 3.9 GHz).

Bumping that 4 bins puts your max 4-core speed at 3.9 GHz, and your max single-thread turbo at 4.3 GHz.
Click to expand...

Thanks for the information, sounds like I could only overclock this cpu by 100mhz then to 3.5, and then + whatever the turbo is? Sorry, I have not kept up with CPU's for the last few years and am not totally understanding where I could get the overclock to be.
 
You can also use the 1.25 strap which puts you at a max overclock of 4.9 GHz (5.4 GHz single core). Non-K versions are just a little bit harder to overclock, but they have just as much OC potential as K versions, provided Intel isn't binning. This is how most Nehalem and Core 2 CPUs are OC'ed anyway.
 
Xeth said:
You can also use the 1.25 strap which puts you at a max overclock of 4.9 GHz (5.4 GHz single core). Non-K versions are just a little bit harder to overclock, but they have just as much OC potential as K versions, provided Intel isn't binning.
Click to expand...


What is the 1.25 strap? I only want to hit like 4.0ghz.
 
Nearsite said:
What is the 1.25 strap? I only want to hit like 4.0ghz.
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It's a divider that lets you use 125Mhz baseclock instead of 100Mhz baseclock without overclocking the other busses like PCIe.

If you want 4.0 you're all set since you can get to 3.9 just by adjusting the multiplier.
 
Xeth said:
It's a divider that lets you use 125Mhz baseclock instead of 100Mhz baseclock without overclocking the other busses like PCIe.

If you want 4.0 you're all set since you can get to 3.9 just by adjusting the multiplier.
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OH cool, thanks! What else would I need to do to get that extra 100mhz? Would you suggest this over the 3750K since it would include hyperthreading.
 
You can overclock your baseclock from 100 to 103 which will get you 3.9 * 103 = 4.02 Ghz
 
Xeth said:
You can also use the 1.25 strap which puts you at a max overclock of 4.9 GHz (5.4 GHz single core). Non-K versions are just a little bit harder to overclock, but they have just as much OC potential as K versions, provided Intel isn't binning. This is how most Nehalem and Core 2 CPUs are OC'ed anyway.
Click to expand...

Are you sure they implemented that in Ivy Bridge? I asked Kyle in his review thread about the rumored higher BCLK multipliers, and he said it was still only limited to 100 MHz :

http://hardforum.com/showpost.php?p=1038643194&postcount=109

I think the "strap" you are referring to is this 1.25 multiplier used to overclock on Socket 2011. See here:

http://www.tomshardware.com/reviews/ivy-bridge-benchmark-core-i7-3770k,3181-9.html

Of course, Kyle might have missed it, but I doubt that. I have not seen a single review mention this feature; you would think it would be worth mentioning if it were real.
 
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defaultluser said:
It should be the same as Sandy Bridge, which was 4+ over the max turbo bin.

If Ivy Turbos like Sandy did, then that means it spends most of it's time fully-loaded at base speed + 100 MHz. With a base speed of 3.4 GHz, this puts the 3770 at max 3.5 GHz fully-loaded (max single-core is 3.9 GHz).

Bumping that 4 bins puts your max 4-core speed at 3.9 GHz, and your max single-thread turbo at 4.3 GHz.
Click to expand...
But how long does it "Turbo"?
a K-chip overclocked to 4.0 Ghz will run 4.0 ghz all the time when loaded, but a non-K's turbo-clocks are only maintained until it reaches certain TDP limits. Am I correct?

So what's the performance difference between a K-chip at 4 Ghz all the time, and an Non-K chip that turbo's to 4 Ghz some of the time?
 
Just get the 3770K, it's not that much more considering how much you're spending anyway, so it seems illogical to cheap out and mess around with the non-K version. Or if you don't regularly use applications that benefit from Hyperthreading just get the 3570K.
 
AnonymousUser said:
What programs/games/etc even use hyperthreading?
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Not any programs that I use on a frequent basis and not any games either... which is why I switch HT off on my i7 920 for lower temps. I guess video encoding and photoshop users would benefit.
 
3dfx_zombie said:
But how long does it "Turbo"?
a K-chip overclocked to 4.0 Ghz will run 4.0 ghz all the time when loaded, but a non-K's turbo-clocks are only maintained until it reaches certain TDP limits. Am I correct?

So what's the performance difference between a K-chip at 4 Ghz all the time, and an Non-K chip that turbo's to 4 Ghz some of the time?
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The TDP limits tests are only concerned with power dissipation. This is why Intel mobile CPUs usually turbo for a limited time: the cooling system in most notebooks can't keep up and the chip throttles as it heats up.

My understanding is that, if you can maintain cool temperatures on your desktop your CPU should maintain turbo frequencies indefinitely. I have not personally tested this.
 
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slh28 said:
Not any programs that I use on a frequent basis and not any games either... which is why I switch HT off on my i7 920 for lower temps. I guess video encoding and photoshop users would benefit.
Click to expand...

Multithreaded game engines actually DO benefit from HT. It's just the case that any Intel quad core i5 or i7 in existence will already deliver enough performance to make the difference miniscule.

See this (slightly broken) game review from inpai:

http://en.inpai.com.cn/doc/enshowcont.asp?id=7986&pageid=8156

Hard to read the broken pictures but you get the gist: there's a tangible %5-10 speedup for Core i3 with HT. The same test with a 2600k yields no speedup. Further speedup will be possible for quad cores with HT once someone builds a game engine that actually stresses heavily more than four threads.
 
slh28 said:
Not any programs that I use on a frequent basis and not any games either... which is why I switch HT off on my i7 920 for lower temps. I guess video encoding and Photoshop users would benefit.
Click to expand...

Oops, I always thought hyper-threading was useful for daily computer usage. Wondering if I can squeeze out a higher OC with it off (or lower v-core). Thanks for the info!

Note: I do use VMware, hyper-threading help with that (or is it generally over hyped and under used)?
 
Wow, I might as well just get the 3570K then becuase I really only play MMO games and maybe use handbrake once a month if that.
 
Nearsite said:
Wow, I might as well just get the 3570K then becuase I really only play MMO games and maybe use handbrake once a month if that.
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I agree, I might build an (always on) Ivy SFF setup soon and might now go (learning HT is mostly useless) with the 3570K too. If HT don't amount to much, I'd be willing to bet the extra 2MB of cache on the 3770K don't amount to much as well. Makes the 3570K the obvious choice.
 
AnonymousUser said:
Wondering if I can squeeze out a higher OC with it off (or lower v-core).
Click to expand...

That's the key point - with HT off I can squeeze an extra 200Mhz with the same voltage and similar temps. So I guess the appropriate comparison is between 3.6Ghz HT on and 3.8Ghz HT off (in my case). As I don't really use any programs which benefit from HT I take the higher clock speed. I think VMware does benefit from HT, but just experiment a little and see what happens. You can definitely get a higher OC with HT off (with Bloomfield anyway).
 
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