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I will need to clear up discrepancies between the two tables below

SPEC CPU 2006 Integer

Below are SPEC CPU 2006 Integer base results for the Opteron 8439 2.8GHz (Istanbul), Xeon X5680 3.33GHz (Westmere), the Xeon 7560 2.26GHz (Nehalem-EX) and the IBM POWER7 4.14GHz.

ProcessorAMD
Opteron
8439
Intel
Xeon
X5680
Intel
Xeon
X7560
IBM
POWER7
SystemHP
DL585G6
Dell
T710
IBM
x3850
IBM
Power 780
Freq 2.8GHz3.33GHz2.26GHz4.14GHz
Cores4x62x64x84x4
400 perlbench 17.1 27.6 20.621.8
401 bzip2 13.4 20.9 15.422.3
403 gcc 14.6 25.6 16.924.7
429 mcf 18.0 45.4 30.763.2
445 gobmk 15.9 26.1 18.722.9
456 hmmr 18.8 50.9 37.424.2
458 sjeng 15.6 27.6 19.823.0
462 libquantum67.6664.0634.078.0
464 h264ref 23.8 39.9 27.542.6
471 omnetpp 13.5 22.5 19.621.5
473 astar 13.4 21.8 16.421.9
483 xalancbmk 17.5 39.7 29.326.8

base

18.3

39.1

29.1

39.3
w/o libq16.2730.2122.0226.84

SPEC CPU 2006 Integer

Below are SPEC CPU 2006 Integer base results for the Xeon X7560 2.26GHz, the IBM POWER6 (at 4.7GHz) and the new POWER7 4.14GHz.

ProcessorIntel
Xeon 7560
IBM
POWER6
IBM
POWER7
SystemIBM
x3850 X5
IBM
p570
IBM
p780
Freq 2.26GHz4.7GHz4.14GHz
Cores4x81x24x4
400 perlb 20.611.321.8
401 bzip2 15.414.222.3
403 gcc 16.916.824.7
429 mcf 30.735.263.2
445 gobmk 18.715.822.9
456 hmmr 37.412.924.2
458 sjeng 19.813.923.0
462 libq 63451.678.0
464 h264ref27.523.742.6
471 omnetpp19.614.521.5
473 astar 16.412.121.9
483 xalanc 29.318.126.8

base

29.1

17.8

29.3
OSSuSE 11RHELAIX 6.1
CompilerIntel C 11.1IBM XL 9.0XL 11.1

The purpose of excluding lib quantum is to compare single core performance.  The Intel compiler can parallelize lib quantum, so it is not a single core result(?). I am somewhat inclined to also exclude hmmr because the Intel 11.1 compiler made substantial improvement over their 11.0 compiler. AMD results are on the PGI 8.0 complier, which may not have either optimizations.  

Reference: SPEC CPU 2006 Integer results
Opteron 8439, HP ProLiant DL585 G6
POWER7, IBM p780
Xeon 5680, Dell PowerEdge T710

The purpose of excluding lib quantum is to compare single core performance.  The Intel compiler can parallelize lib quantum, so it is not a single core result(?). I am somewhat inclined to also exclude hmmr because the Intel 11.1 compiler made substantial improvement over their 11.0 compiler. AMD results are on the PGI 8.0 complier, which may not have either optimizations. The IBM compiler can achieve spectaclar libquantum (909) in the Peak test, but not in the Base test. In the Peak test, the Xeon 5680 and POWER are very close (41.8 to 44.0)  

Without libquantum, Xeon 5680 3.33GHz is still the most powerful processor. However, the IBM POWER7 is now clearly ahead of the Xeon 7560 at 2.26GHz.

Below are SPEC CPU 2006 Integer base results for the Opteron 8439 2.8GHz and Xeon X5680 3.33GHz.

ProcessorAMD
Opteron
8439
Intel
Xeon
X5680
SystemHP
DL585G6
Dell
T710
Freq 2.8GHz3.33GHz
Cores4x62x6
400 perlbench 17.127.6
401 bzip2 13.420.9
403 gcc 14.625.6
429 mcf 18.045.4
445 gobmk 15.926.1
456 hmmr 18.850.9
458 sjeng 15.627.6
462 libquantum67.6664.0
464 h264ref 23.839.9
471 omnetpp 13.522.5
473 astar 13.421.8
483 xalancbmk 17.539.7

base

18.3

39.1
w/o libq16.2730.21

Below are SPEC CPU 2006 Integer base results for the Opteron 8435 2.6GHz and Opteron 8439 2.8GHz.

ProcessorAMD
Opteron
8435
AMD
Opteron
8439
SystemHP
DL585
HP
DL585
Freq 2.6GHz2.8GHz
Cores4x64x6
400 perlbench 15.917.1
401 bzip2 12.613.4
403 gcc 14.014.6
429 mcf 17.718.0
445 gobmk 14.915.9
456 hmmr 17.518.8
458 sjeng 14.615.6
462 libquantum66.967.6
464 h264ref 22.123.8
471 omnetpp 13.113.5
473 astar 12.613.4
483 xalancbmk 16.317.5

base

17.3

18.3
w/o libq15.3616.27

Below are the SPEC CPU 2006 Integer base results for recent Xeon and Opteron processors. SPEC CPU used to be a single core metric, but new compilers generate threaded code for some of the components.

SPEC CPU 2006 Integer Base

DateSystemcoresMHzCacheProcessSPEC
-4 x Xeon X7350 Quad2.93G2x4M65nm21.0
-4 x Opteron 8360 Quad2.50G2M 65nm14.4
-4 x Xeon X7460 Six 2.66G16M 45nm21.7
-4 x Opteron 8384 Quad2.70G6M 45nm16.9
-2 x Xeon X5570 Quad2.93G8M 45nm31.5
-4 x Opteron 8439 Six 2.80G6M 45nm19.7