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Ah ok, a couple of the guys at microcenter said they heard the Costa Rica chips theoretically were better for overclocking, but perhaps they just wanted to move the older chips
I can't really seem to find any information either way, just curious if there was any merit to their claims
Here is you solution:
www.siliconlottery.com
These guys test each CPU individually and resell them at a price that is related to the overclocking potential. In other words, you pay a price premium to eliminate the uncertainty factor.
You could theoretically find "hot streaks" of chips on a shelf that came from the same part of a wafer, but a batch is well north of 10k chips spread out over hundreds of wafers.
This seems like a scam. The pricing that would be required to turn a profit on self-binning chips would be way beyond what most people would pay. You would have to go through probably 10 5960x's to find one that can do 4.7ghz, and reselling 9 of them you're taking a $200 loss. So $2800 would be the fair price to break even, but they're only asking $1200?
Before accusing anybody of scamming, I would suggest to perform some research fist and provide evidence.
Anyway, these guys are legit according to Guru3D.com .
http://www.guru3d.com/articles-pages/core-i7-4790k-processor-5-ghz-review-a-silicon-lottery,1.html