PCMark05 Professional measures the system performance by running several tests. We selected two batches for our comparisons, System and CPU.

The System batch performs the following tests: HDD XP Startup, Physics and 3D, 2D Transparent Window, 3D Pixel Shader, Web Page Rendering, File Decryption, 2D Graphics Memory – 64 lines, HDD General Usage and three multithreading tests.

The CPU batch performs the following tests: File Compression, File Decompression, File Encryption, File Decryption, Image Decompression, Audio Compression and two multithreading tests.

The results are given in a PCMark05 specific unit.

PCMark05 Professional 1.2.0 - System Batch	Score	Difference
Core 2 Extreme QX6700 (2.66 GHz)	8308	11.89%
Core 2 Extreme X6800 (2.93 GHz)	7803	5.09%
Core 2 Duo E6750 (2.66 GHz)	7425
Core 2 Duo E6700 (2.66 GHz)	7334	1.24%
Pentium 4 550 (3.4 GHz)	4691	58.28%

Here Core 2 E6750 achieved the same performance level of Core 2 Duo E6700. Notice that we are using a newer version of PCMark05, which is now capable of taking advantage of more than two CPU cores, as now QX6700 achieved the highest score and on our previous tests Core 2 Extreme X6800 had been the fastest CPU on this program.

PCMark05 Professional 1.2.0 - CPU	Score	Difference
Core 2 Extreme QX6700 (2.66 GHz)	8619	25.73%
Core 2 Extreme X6800 (2.93 GHz)	7557	10.24%
Core 2 Duo E6750 (2.66 GHz)	6855
Core 2 Duo E6700 (2.66 GHz)	6848	0.10%
Pentium 4 550 (3.4 GHz)	4097	67.32%

On PCMark05 CPU batch the same thing happened: Core 2 Duo E6750 achieved the same performance level as Core 2 Duo E6700.