Futuremark 3DMark05 1.2.0	Source: FutureMark

3DMark05 is best suited for the latest generation of DirectX9.0 graphics cards. It is the first benchmark to require a DirectX9.0 compliant hardware with support for Pixel Shaders 2.0 or higher! By combining high quality 3D tests, CPU tests, feature tests, image quality tools, and much more, 3DMark05 is a premium benchmark for evaluating the latest generation of gaming hardware.

Futuremark 3DMark05 1.2.0
Overall:	Points	Ranking
Intel Pentium D 840	8562
Intel Pentium D 940	7700
AMD Sempron 3600+	7405
AMD Athlon64 4000+	7728
AMD Athlon64 FX-60	12825
AMD Athlon64 X2 5000+	7929
AMD Athlon64 FX-62	7975
Intel Core 2 Duo E6600	8045
Intel Core 2 Duo E6600 (Overclocked to 3.4 GHz)	8320
CPU:	Points	Ranking
Intel Pentium D 840	6532
Intel Pentium D 940	6225
AMD Sempron 3600+	4869
AMD Athlon64 4000+	5365
AMD Athlon64 FX-60	6867
AMD Athlon64 X2 5000+	6575
AMD Athlon64 FX-62	7533
Intel Core 2 Duo E6600	9727
Intel Core 2 Duo E6600 (Overclocked to 3.4 GHz)	12410

Please note that the AMD Athlon64 FX-60 is running in SLI mode while the other systems are running a single videocard. The Intel Core 2 Duo does very well in 3DMark05 and it's in the CPU tests where it really impresses. While overclocked to 3.4 GHz the system is able to crack the 12000 point mark. Outstanding!

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.

Futuremark 3DMark06 1.0.2
Overall:	Points	Ranking
Intel Pentium D 840	4212
Intel Pentium D 940	4346
AMD Sempron 3600+	3617
AMD Athlon64 4000+	3886
AMD Athlon64 FX-60	7410
AMD Athlon64 X2 5000+	4483
AMD Athlon64 FX-62	4551
Intel Core 2 Duo E6600	4463
Intel Core 2 Duo E6600 (Overclocked to 3.4 GHz)	4664
CPU:	Points	Ranking
Intel Pentium D 840	1685
Intel Pentium D 940	1590
AMD Sempron 3600+	783
AMD Athlon64 4000+	947
AMD Athlon64 FX-60	1981
AMD Athlon64 X2 5000+	1939
AMD Athlon64 FX-62	2147
Intel Core 2 Duo E6600	2017
Intel Core 2 Duo E6600 (Overclocked to 3.4 GHz)	2638

3DMark06's overall score is very close, it shouldn't be a surprise because games these days are more heavily dependant on videocards. Things are very different in the CPU section, at stock the Intel Core 2 Duo E6600 is beaten by the AMD Athlon64 FX-62 but nothing can catch the E6600 system when it is overclocked.