We upgraded Quake 4 to version 1.4.2 and ran its new multiplayer demo id_perftest at 1280x1024x32 with SMP option enable (which allows Quake 4 to recognize and use more than one CPU), under two scenarios: first with image quality settings configured at “low” and then with image quality settings configured at “high”. You can check the results below, given in frames per second.

Quake 4 1.4.2 - Low	Score	Difference
Core 2 Extreme QX9650 (3 GHz)	202.65
Core 2 Extreme QX6850 (3 GHz)	202.27	0.19%
Core 2 Duo E6750 (2.66 GHz)	198.87	1.90%
Core 2 Extreme X6800 (2.93 GHz)	198.59	2.04%
Core 2 Extreme QX6700 (2.66 GHz)	196.48	3.14%
Core 2 Duo E6700 (2.66 GHz)	195.08	3.88%
Core 2 Duo E6600 (2.4 GHz)	190.26	6.51%
Pentium 4 550 (3.4 GHz)	77.22	162.43%

Quake 4 1.4.2 - High	Score	Difference
Core 2 Extreme QX9650 (3 GHz)	193.59
Core 2 Extreme QX6850 (3 GHz)	193.43	0.08%
Core 2 Duo E6750 (2.66 GHz)	191.22	1.24%
Core 2 Extreme X6800 (2.93 GHz)	190.53	1.61%
Core 2 Extreme QX6700 (2.66 GHz)	188.74	2.57%
Core 2 Duo E6700 (2.66 GHz)	187.06	3.49%
Core 2 Duo E6600 (2.4 GHz)	182.71	5.95%
Pentium 4 550 (3.4 GHz)	75.23	157.33%