Re: Nocona [Intel 64-bit cpu timing]

tomstdenis_at_gmail.com
Date: 08/25/05 

Date: 24 Aug 2005 20:31:44 -0700

Paul Rubin wrote:
> I thought there were some Pentiums now with AMD64 instructions.

EMT64 == x86_64

New graphs just for RSA-1024 including my dual-core RSA on the
Nocona...

Normalized clock to 1.8Ghz
http://libtomcrypt.org/rsa_1024_norm.png

Raw data
http://libtomcrypt.org/rsa_1024_raw.png

Yes, that's right. A 32-bit Athlon-XP **LAPTOP** using TFM with slow
memory [it was last measured at a mere 460MiB/sec] can match the 64-bit
Necona using SSL [TFM isn't that much faster than the AMD32] with twice
the cache and way faster memory.

Again the clock rate is helping a bit [if you look at the raw] but even
then the AMD64 floors the Necona when running 600Mhz slower.

Tom

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