Futuremark 3DMark06 1.0.2	Source: FutureMark

3DMark06 is the worldwide standard in advanced 3D game performance benchmarking. A fundamental tool for every company in the PC industry as well as PC users and gamers, 3DMark06 uses advanced real-time 3D game workloads to measure PC performance using a suite of DirectX 9 3D graphics tests, CPU tests, and 3D feature tests. 3DMark06 tests include all new HDR/SM3.0 graphics tests, SM2.0 graphics tests, AI and physics driven single and multiple cores or processor CPU tests and a collection of comprehensive feature tests to reliably measure next generation gaming performance today.

3DMark06
Overall:	Points	Ranking
Intel Core 2 Duo E6600	4463
Intel Pentium D 940	4346
Intel Pentium D 840	4212
AMD Athlon64 FX-60 (Socket 939)	7410
AMD Athlon64 4000+ (Socket 939)	3886
AMD Athlon64 FX-62 (Socket AM2)	4551
AMD Athlon64 X2 5000+ (Socket AM2)	4483
AMD Sempron 3600+ (Socket AM2)	3617
AMD Athlon64 X2 4800+ (Socket AM2)	4411
AMD Athlon64 X2 4800+ (Socket AM2 Overclocked to 3.03 GHz)	4603
CPU:	Points	Ranking
Intel Core 2 Duo E6600	2017
Intel Pentium D 940	1590
Intel Pentium D 840	1685
AMD Athlon64 FX-60 (Socket 939)	1981
AMD Athlon64 4000+ (Socket 939)	947
AMD Athlon64 FX-62 (Socket AM2)	2147
AMD Athlon64 X2 5000+ (Socket AM2)	1939
AMD Sempron 3600+ (Socket AM2)	783
AMD Athlon64 X2 4800+ (Socket AM2)	1876
AMD Athlon64 X2 4800+ (Socket AM2 Overclocked to 3.03 GHz)	2215

Surprisingly overclocking the Athlon64 X2 4800+ processor does boost the overall score in 3DMark06 slightly. The X2 4800+ running past 3 GHz gets the highest score in the CPU portion of 3DMark06's test.

ID Software Doom 3 1.3	Source: id Software

Doom 3 takes advantage of the latest videocard technology and pushes the processing power of the CPU to its absolute limit. At its highest setting, Ultra quality, texture sizes pass the 500MB mark which means even tomorrow's videocards will have a hard time running everything. The frame rates in the game itself are locked at 60 fps so anything above that point is wasted. Each test is run three times with the third run being recorded.

Doom 3:
LQ 640x480:	FPS	Ranking
Intel Core 2 Duo E6600	194.5
Intel Pentium D 940	138.4
Intel Pentium D 840	128.3
AMD Athlon64 FX-60 (Socket 939)	160.1
AMD Athlon64 4000+ (Socket 939)	128.9
AMD Athlon64 FX-62 (Socket AM2)	168.9
AMD Athlon64 X2 5000+ (Socket AM2)	141
AMD Sempron 3600+ (Socket AM2)	91.4
AMD Athlon64 X2 4800+ (Socket AM2)	138.6
AMD Athlon64 X2 4800+ (Socket AM2 Overclocked to 3.03 GHz)	161.5
HQ 1024x768:	FPS	Ranking
Intel Core 2 Duo E6600	172.3
Intel Pentium D 940	135.8
Intel Pentium D 840	110.7
AMD Athlon64 FX-60 (Socket 939)	159.3
AMD Athlon64 4000+ (Socket 939)	127.9
AMD Athlon64 FX-62 (Socket AM2)	158.6
AMD Athlon64 X2 5000+ (Socket AM2)	141.6
AMD Sempron 3600+ (Socket AM2)	91.1
AMD Athlon64 X2 4800+ (Socket AM2)	136.9
AMD Athlon64 X2 4800+ (Socket AM2 Overclocked to 3.03 GHz)	150.3

At stock speeds the AMD Athlon64 X2 4800+ is a decent gaming processor, it's not the fastest at stock, but it does offer a good mix of value and performance. Once overclocked, the X2 4800+ runs quite a bit faster. If you need every last framerate, you'll want to overclock the CPU.