[RC5] difference between cuda and stream

Mike Reed mikereedwt at gmail.com
Tue Jan 8 18:10:28 EST 2013


To follow on from my earlier notes..

If you look at bug 4512 in bugzilla, you will see that the AMD HD 7870
chip running at 1 Ghz can turn over RC5 keys at a rate of 1.9 Gk/sec.
This is a speed of over 7 stats units per second. At these speeds, I/O
becomes a limiting factor, which is one of the reasons that we have
moved towards larger packets of work.

Kind regards,

On 8 January 2013 20:05, Mike Reed <mikereedwt at gmail.com> wrote:
> Hi,

> One stats unit / block is 2^28 keys in length. Not nearly something or maybe
> something. For graphics cards, iter 64 (i.e. 64 x 2^28) is common. Proxies
> give out packets up to iter 256.

> Kind regards,
> Mike

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