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Date: Thu, 25 Jul 2013 04:04:26 +0200
From: Lukas Odzioba <>
Subject: Re: PBKDF2-HMAC-SHA256

2013/7/24 Solar Designer <>:
> Oh, I guess this speed difference has nothing to do with 7990 vs. 7970,
> but is about Catalyst version and clock rate differences (which we're
> tuning on the 7990 to prevent its GPU 0 from overheating - so you'd get
> different speeds on GPU 0 vs. GPU 1).  You need to check the current
> clock rates before considering the performance numbers you obtain.

Sure you're right. Posting 7990 results was unecessary in this case.

BTW not surprisingly PBKDF2-SHA512 results are much slower:
6950: 2460 c/s
Titan: 2269 c/s

More details on that later.


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