Distributed.net

Tested speeds

x86/ELF Client

Intel Pentium 4 3.2GHz

Single Socket system (1 core)

[Feb 19 17:40:49 UTC] RC5-72: Completed CC:674C8FC3:00000000 (1.00 stats units)
                      0.00:11:50.72 - [6,043,121 keys/s]

Intel Pentium 4 2.4GHz

Single Socket system (1 core)

[Feb 19 18:47:25 UTC] RC5-72: Summary: 2 packets (2.00 stats units)
                      0.00:32:26.36 - [4,413,332 keys/s]

Intel Xeon E5335 2.0GHz

Dual Socket system (8 cores)

[Jul 22 18:29:58 UTC] RC5-72 #a: Completed CC:6777DCB6:00000000 (1.00 stats units)
                      0.00:10:28.69 - [6,636,950 keys/s]

AMD Opteron 244

Dual Socket system (2 cores)

[Feb 19 18:09:12 UTC] RC5-72: Summary: 4 packets (4.00 stats units)
                      0.00:18:36.03 - [15.39 Mkeys/s]

AMD64 Client

AMD Opteron 6174

Dual Socket system (24 cores)

[Feb 19 16:43:25 UTC] RC5-72: Summary: 24 packets (24.00 stats units)
                      0.00:08:17.84 - [198.32 Mkeys/s]

As a note, dnetc was not able to detect the processor properly because it is a preproduction:

[Feb 19 16:35:07 UTC] Automatic processor type detection did not 
                      recognize the processor (tag: "40010001")

AMD Opteron 8435

Quad Socket system (24 cores)

[Feb 19 16:16:40 UTC] RC5-72: Summary: 24 packets (24.00 stats units)
                      0.00:12:18.67 - [139.55 Mkeys/s]

AMD Opteron 2427

Dual Socket system (12 cores)

[Feb 19 19:07:09 UTC] RC5-72: Summary: 18 packets (18.00 stats units)
                      0.00:13:49.64 - [75.24 Mkeys/s]

AMD Opteron 2356

Dual Socket system (8 cores)

[Feb 19 17:07:48 UTC] RC5-72: Summary: 16 packets (16.00 stats units)
                      0.00:12:19.47 - [72.86 Mkeys/s]

AMD Opteron 2350

Dual Socket system (8 cores)

[Feb 19 17:49:25 UTC] RC5-72: Summary: 8 packets (8.00 stats units)
                      0.00:10:48.51 - [52.98 Mkeys/s]

AMD Opteron 2214

Dual Socket system (4 cores)

[Feb 19 19:25:10 UTC] RC5-72: Summary: 12 packets (12.00 stats units)
                      0.00:14:55.03 - [26.42 Mkeys/s]

AMD Opteron 875

Quad Socket system (8 cores)

[Feb 19 17:35:08 UTC] RC5-72: Summary: 12 packets (12.00 stats units)
                      0.00:15:16.32 - [53.65 Mkeys/s]

AMD Opteron 275

Dual Socket system (4 cores)

[Feb 19 17:17:58 UTC] RC5-72: Summary: 8 packets (8.00 stats units)
                      0.00:07:22.31 - [34.73 Mkeys/s]

AMD Opteron 250

Dual Socket system (2 cores)

[Feb 19 17:57:58 UTC] RC5-72: Summary: 8 packets (8.00 stats units)
                      0.00:16:11.65 - [18.80 Mkeys/s]

Intel Xeon E5462

Dual Socket system (8 cores)

[Feb 19 18:43:10 UTC] RC5-72: Summary: 40 packets (40.00 stats units)
                      0.00:42:02.47 - [67.05 Mkeys/s]