ICOMP (index)

iCOMP for Intel Comparative Microprocessor Performance was an index published by Intel used to measure the relative performance of its microprocessors.

Various CPUs marked with iCOMP index's.

i486 DX4 75 MHz
iCOMP=319

i486 DX4 100 MHz
iCOMP = 435

Pentium 60 MHz
iCOMP = 510

Pentium 100 MHz
iComp = 815

Pentium 120 MHz
iCOMP = 1000

Pentium 120 MHz
iCOMP 2 = 100

Pentium 133 MHz
iCOMP 2 = 111

Pentium 150 MHz
iCOMP 2 = 114

Intel was motivated to create the iCOMP rating by research which showed that many computer buyers assumed that the clock speed – the “MHz” rating – was indicative of performance, regardless of the processor type. iCOMP ratings based on standard benchmarks.^[1] The formula for calculating iCOMPs is like this:

Category	Benchmark	Weight
16-bit Integer	ZDbenchCPU	052%
16-bit Floating-Point	16-bit Whetstone	002%
	ZDbenchCPU	001%
16-bit Graphics	ZDbenchCPU*	010%
16-bit Video	ZDbenchCPU*	005%
32-bit Integer	SPECint92	015%
32-bit Floating-Point	SPECfp92	005%
32-bit Graphics	SPECint92*	005%
32-bit Video	SPECint92*	005%

The largest component is the integer CPU benchmark from Ziff-Davis Labs (ZDbenchCPU), which is derived from the earlier PC Labs benchmarks. Whetstone (as implemened in PowerMeter) is used for 16-bit floating-point, and SPECint92 and SPECfp92 are used for the 32-bit components.^[1]

There were three revisions of the iCOMP index. Version 1.0 (1992) was benchmarked against the 486SX 25, while version 2.0 (1996) was benchmarked against the Pentium 120.^[2] For Version 3.0 (1999) it was Pentium II at 350 MHz.^[3]

Intel iCOMP (Full List)^[4]

CPU Name	Clock (MHz)	iCOMP 3.0	iCOMP 2.0	iCOMP 1.0
Pentium III	1000	3280
	933	3100
	866	2890
	800	2690
	750	2540
	700	2420
	650	2270
Pentium III E	600	2110
Pentium III	600	1930
	550	1780
	500	1650
	450	1500
Pentium II	450	1240	483
	400	1130	440
Celeron	400	1011	394
Pentium II OverDrive	333	1001	387
Pentium II	350	1000	386
	333	940	366
Pentium II OverDrive	300		351
Celeron	366	890	344
Pentium II	300		332
Celeron	333		318
Pentium II	266		303
Celeron A	300		296
Pentium II	233		267
Celeron	300		226
Pentium Pro 256K	200		220
Celeron	266		213
Pentium MMX	233		203
Pentium Pro 256K	180		197
Pentium Pro 512K	166		186
Pentium MMX	200		182
Pentium OverDrive MMX 200	200		181
Pentium Pro 256K	150		168
Pentium OverDrive MMX 180	180		163
Pentium MMX	166		160
Pentium OverDrive MMX 166	166		157
Pentium MMX	150		144
Pentium OverDrive MMX 150	150		144
Pentium	200		142
	166		127	1308
Pentium OverDrive	166		127	1308
Pentium OverDrive MMX 150	125		120
Pentium	150		114	1176
Pentium OverDrive	150		114	1176
Pentium	133		111	1110
Pentium OverDrive	125			1070
Pentium	120		100	1000
Pentium OverDrive	133		84	970
	120		75	877
Pentium	100		90	815
	90		81	735
	75		67	610
Pentium OverDrive	83			581
Pentium	66		57	567[5]
	60		51	510
Pentium OverDrive	63			443
i486 DX4	100			435
	75			319
i486 DX2	66			297
i486 DX	50			249
i486 DX2	50			231
i486 OD-25	50			231[6]
i486 SX2	50			180
i486 DX	33			166
i486 OD-20	40			166[7]
i486 SX	33			136
i486 OD-20	33			132[8]
i486 DX	25			122
i486 SX	25			100
	20			78
i386 DX	33			68
i486 SX	16			63
i386 DX	25			49
i386 SL	25			41
i386 SX	25			39
	20			32
	16			22

See also

• PR rating