Addendum:

>> dnetc: [...]
>> AmigaMARK: [...]
>> nbench: [...]
>> Stream: [...]

> I prepared a relative comparison with my 1.5 GHz Mac mini G4. The following list
> shows the performance of your 2.0 GHz X5000/Cyrus/P5020 compared to my
> 1.5 GHz Mac mini/MPC7447A (=1.00) at the leftmost position, then the scaled
> per-clock performance comparison, and the name of the specific test at last position.

Comparison of 2.0 GHz X5000/Cyrus/P5020 with my 2.3 GHz PowerMac G5/PPC970FX (=1.00):

dnetc

0.99 | 1.14 : KOGE 3.1 Scalar
1.05 | 1.20 : MH 2-pipe
0.98 | 1.13 : KKS 2-pipe
1.10 | 1.27 : KKS 604e
1.22 | 1.40 : MH 1-pipe
1.20 | 1.38 : MH 1-pipe 604e

AmigaMARK CPU

1.30 | 1.49 : BogoMIPS ppc-assembler inline
1.03 | 1.19 : Dhrystones
0.80 | 0.92 : 40th Fibonacci number
0.64 | 0.74 : FPU query [Double Precision] - Al Aburto
0.78 | 0.89 : LibJPEG - libjpeg [v6b]
0.95 | 1.10 : Mars chiper
1.34 | 1.55 : MD5 checksuming (RFC 1321) L. Peter Deutsch
1.10 | 1.26 : MP3 -> CDDA [mpega.library]
1.04 | 1.20 : Serpent chiper
0.74 | 0.85 : ZLib functions [v1.1.4]
0.94 | 1.08 : TOTAL CPU

AmigaMARK Memory

1.32 | 1.52 : Read CPU-Cache
0.31 | 0.36 : Read FAST byte [8]
0.30 | 0.35 : Read FAST word [16]
0.42 | 0.49 : Read FAST long [32]
0.35 | 0.40 : Write FAST byte [8]
0.36 | 0.42 : Write FAST word [16]
0.48 | 0.56 : Write FAST long [32]
0.43 | 0.50 : Copy FAST 2 FAST
0.76 | 0.87 : Allocate Memory FAST
1.30 | 1.50 : Initialize Memory FAST
0.60 | 0.69 : TOTAL MEM

nbench

1.35 | 1.55 : NUMERIC SORT
0.74 | 0.85 : STRING SORT
1.17 | 1.34 : BITFIELD
0.93 | 1.07 : FP EMULATION
0.74 | 0.86 : FOURIER
0.93 | 1.07 : ASSIGNMENT
1.25 | 1.44 : IDEA
1.04 | 1.19 : HUFFMAN
0.68 | 0.78 : NEURAL NET
0.55 | 0.63 : LU DECOMPOSITION
1.04 | 1.19 : INTEGER INDEX
0.65 | 0.75 : FLOATING-POINT INDEX
0.93 | 1.07 : MEMORY INDEX
1.13 | 1.30 : INTEGER INDEX

stream

0.56 | 0.65 : Copy
0.61 | 0.70 : Scale
0.74 | 0.85 : Add
0.73 | 0.84 : Triad