50x Core i7 3770K OC test (5G air + LN2)

[_mat_]

I've binned 4 retail cpus so far, all Malay.

Week 08 => 6,5 GHz 1M
Week 20 => 6,6 GHz 1M
Week 20 => 6,8 GHz 1M
Week 20 => crap but good memory controller (3000 MHz+)

Not too bad at all.

[sin0822]

batch consistency? Yea same as sandy bridge i would say. Some CPUs in same batch can't even do 5G, not all of them get high frequency?

my theory is that out of every batch you can get a few good CPUs. The 6.8G is very good.

Why do all malaysia suck?

Thanks for all the hard work massman, we appreciate you sharing your results.

[ZoLKoRn]

i don't care for batch anymore now but now very interesting for Costa Rica vs Malaysia ! seem Ivy from Malaysia so bad !
and some user on my forums (not ksin LoL) his have good one 3770K from Costa Rica for IMC, he can boot by 2933 strap
and can LinX stress for 2950MHz(1:14) all air.

btw. but i just got one 3770K about 6hrs ago and it Made in Malaysia L221B386 LOL hope it will good one hehehe

Thanks for sharing Massman

more btw. so have some good chip for air cooling for sell ? like 5GHz and around 1.3-1.4V hehehe

[knopflerbruce]

Originally Posted by Sam OCX

fyi, law of large numbers does not work for CPU binning as you're looking for the best sample rather than the average.
Either way, since we (=mortals) are working with a small sample size, no decent statistical analysis can ever be possible.

The sample size we had for SB was large enough, we had more than 100 B batches at least. The difference between CR and Malay was roughly 100 MHz when I did my calculations, and from what I recall, C batches were roughly 100MHz better than A, too and A again about 70-80 better than B. That's a fairly huge variation, and with as many as 100 results I'm sure that the chances of this being just a coincidence is minimal. I could refresh my knowledge about statistics and prove it, but hell - if you guys don't believe it it just makes it easier for me to find good chips if i decide to start binning these things

[knopflerbruce]

Originally Posted by Massman

http://en.wikipedia.org/wiki/Law_of_large_numbers

It is all about luck. Even within good batches there are super crappy samples. Buy one sample and you'll need luck to get a great one!

Well, if you increase your chances by picking the right batches. 10% is better than 5%.

[Massman]

Originally Posted by Sam OCX

fyi, law of large numbers does not work for CPU binning as you're looking for the best sample rather than the average.
Either way, since we (=mortals) are working with a small sample size, no decent statistical analysis can ever be possible.

Essentially the theorem says that the larger the CPU binning sample size, the closer you get to the average overclocking capability of that one specific batch. If there's such a thing as better/worse batches, that average would be different. I think we can all assume there are better and worse batches.

As you point out, though, most of us are working with small sample size. For that case, the theorem basically points out that there's no guarantee for the sample to come close to the expected (="average") overclocking capability. Essentially ... luck.

Originally Posted by knopflerbruce

Well, if you increase your chances by picking the right batches. 10% is better than 5%.

The fact that you use the word 'chances' indicates it's still about luck .

[K404]

Never mind 225-229 will be here soon!

[Splave]

IMO try to get 5-10 of the same exact batch number

[Viss]

15 pcs 3218C017, 4 of them need >1.35v to boot 50x100 4/8 @ air.

[zzolio]

the one 3218C017 i have will 1,295V 4/4 and 1,33V 4/8

and 6150mhz on cascade 32M 2/2