[RC5] Why does Pentium 3 process faster than Pentium 4?

Jim Reisert AD1C jjreisert at alum.mit.edu
Tue Dec 10 20:51:03 EST 2002


I have three machines running the RC5-72 client.  They are idle during the 
day, so 99% of computes go to the project (no screen savers or any 
background tasks running). Here are the keyrates for the three 
machines.  The rate of the P4 is the same as the rate of the faster P3, but 
is running at 1.7 GHz instead of 0.9 GHz.  What gives?

- Jim

*****  P3 866 MHz (Windows 2000 Professional)

[Dec 10 03:27:23 UTC] Automatic processor type detection found
                       an Intel Pentium III processor.
[Dec 10 03:28:00 UTC] RC5-72: using core #4 (SES 2-pipe).

[Dec 10 09:17:30 UTC] RC5-72: Completed CA:40E49A33:00000000 (1.00 stats units)
                       0.00:53:24.65 - [1,340,246 keys/s]
[Dec 10 10:10:54 UTC] RC5-72: Completed CA:40E49A34:00000000 (1.00 stats units)
                       0.00:53:23.91 - [1,340,556 keys/s]
[Dec 10 11:04:18 UTC] RC5-72: Completed CA:40E49A35:00000000 (1.00 stats units)
                       0.00:53:23.90 - [1,340,561 keys/s]

*****  P3 933 MHz (Windows XP Professional)

[Dec 10 03:04:25 UTC] Automatic processor type detection found
                       an Intel Pentium III processor.
[Dec 10 03:05:03 UTC] RC5-72: using core #4 (SES 2-pipe).

[Dec 10 11:15:12 UTC] RC5-72: Completed CA:4033E3B3:00000000 (1.00 stats units)
                       0.00:39:17.75 - [1,821,665 keys/s]
[Dec 10 11:54:29 UTC] RC5-72: Completed CA:4033E3B4:00000000 (1.00 stats units)
                       0.00:39:17.15 - [1,822,129 keys/s]
[Dec 10 12:34:05 UTC] RC5-72: Completed CA:4033E3B5:00000000 (1.00 stats units)
                       0.00:39:35.36 - [1,808,156 keys/s]

*****  P4 1.7 GHz (Windows XP Professional)

[Dec 10 02:17:28 UTC] Automatic processor type detection found
                       an Intel Pentium 4 processor.
[Dec 10 02:17:28 UTC] RC5-72: using core #6 (DG 3-pipe).

[Dec 10 13:19:53 UTC] RC5-72: Completed CA:4034E984:00000000 (1.00 stats units)
                       0.00:38:49.75 - [1,843,559 keys/s]
[Dec 10 13:56:34 UTC] RC5-72: Completed CA:4034E985:00000000 (1.00 stats units)
                       0.00:36:40.48 - [1,951,858 keys/s]
[Dec 10 14:31:09 UTC] RC5-72: Completed CA:4034E986:00000000 (1.00 stats units)
                       0.00:34:34.19 - [2,070,701 keys/s]

-- 
Jim Reisert AD1C, 7 Charlemont Court, North Chelmsford, MA 01863
USA +978-251-9933, <jjreisert at alum.mit.edu>, http://www.ad1c.com
PGP Fingerprint: D8E2 3D78 339F A7F1 8C13  1193 B5D1 4FB6 79D1 70DC

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