PCMark04 and 2005 are application-based benchmarks and a premium tool for measuring overall PC performance. They use portions of real applications instead of including very large applications or using specifically created code. This allows them to be smaller installations as well as to report very accurate results. As far as possible, PCMark04 and 2005 use public domain applications whose source code can be freely examined by any user.

Both PCMark04 and PCMark05 include 4 categorized suites for benchmarking your computer. These include CPU, Graphics, Memory and a Hard Disk Drive benchmark. In our case, we selected only the CPU test suite.

Once more, the D 840 leads the race while the D 820 once again outperformed the 650. If you take a look at the following table and comparing the D 820 with the P 650, you'll see that the D 820 performed better in most of the tasks, even though they are all single thread processes. In the File Decryption, Audio Conversion and DivX Video Compression tests, the P4 650 was faster.

The test results, more analytically:

While the overall test scores shown in the graph above don't show it, the analytical table below reveals a slightly different story with PCM05, probably because the tests are more recent than the previous PCMark04 and include benchmarks that test the processors with multithreading. According to the analytical results with PCM05, both the D 820 and D 840 had worse performance than the P4 650 in the single threaded tests, while in the case of multithreading, much better. Notice here how multithreading with single core and dual core affects the performance in each task. For example, File Compression and File Encryption hardly change from single-thread to multithread with the D 820, whereas with the P4 650, there is a substantial drop in performance. The same happens when the processes are more than two, where the Dual Core processors demonstrates their power.