SPEC marks are the most common means by which CPUs are benchmarked. They involve running a number of real world applications. These are generally considered fairly accurate but like any benchmarks do not tell the whole story.

KEY

MHz - CPU Clock speed in millions of cycles per second.
SPEC Int 95 - Benchmark result for interger processing.
SPEC fp95 - Benchmark result for floating point processing.

Intel x86

CPU	MHz	SPEC Int95	SPEC fp95
Pentium	133	4.2	3.3
Pentium MMX	233	7.1	5.2
Pentium 2	300	11.9	8.6
	350	13.9	11.2
	400	15.8	12.4
	450	17.2	12.9
Pentium 2 Xeon	450	18.9	14.7

Motorola / IBM PowerPC

CPU	MHz	SPEC Int95	SPEC fp95
PPC 750	233	11	8.1
	300	14.2	10.3
	350	16.7	11.4
	366	17.2	11.1
	400	18.8	12.2

Compaq ALPHA

CPU	MHz	SPEC Int95	SPEC fp95
21164PC	466	14.6	17.4
21164A	500	15.0	20.4
	600	18.4	21.3
21264	575	30.3	47.7
	667	44	66
21264	700	46?	70?

Sun UltraSPARC

CPU	MHz	SPEC Int95	SPEC fp95
UltraSPARC 2i	300	12.1	12.9
	360	15.2	19.9
UltraSPARC 2	300	12.1	18.8
	360	16.1	23.5
	450	19.6	27.1

MIPs Rx000

CPU	MHz	SPEC Int95	SPEC fp95
R10000	180	10.3	15.6
	195	11.4	19.1
	250	14.7	24.5

Hewlett Pacard PA-RISC

CPU	MHz	SPEC Int95	SPEC fp95
PA 8000	180	11.8	20.2
PA 8200	220	15.5	25

For loads more information on these and many, many other chips see HERE.

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