Do note that all the SANDRA benchmarks are synthetic and thus may not tally with real-life performance. The latter stands for whatever your environment is, i.e. which applications you run with what amount of data and so on. It is up to you to decide whether what Sandra measures is what you want to measure.

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Below you can find the scores of Sandra starting with memory performance:

It is really difficult to understand what we present to you. Interpreting data in the way we tested and what we can show you simply is hard to comprehend, especially with all the mathematic BIOS timings and dividers.

Memory tweaking and overclocking is close to science.

You'll notice the OCZ SLi Ready 4GB kit memory at 800 MHz (default) and also the results overclocked towards 1066 MHz which ran absolutely stable as well at the same timings !

All other memories run at the default specified maximum timings.

This basically means you insert it into your PC, it reads the SPD from memory and the PC then decides what timings and voltage to use. As you can see, subtle differences, but the differences are there alright.

Now for 2x 2GB modules which usually have high latency, this seriously doesn't suck. In fact we can run this memory at 1066 MHz with the same timings. And to show you how good of a sport I am, I'll include both the 800 and 1066 MHz results in all tests. Look how darn close the kit is to the OCZ Reaper memory, yikes !
 

PCMark 2005
PCMark 05 is the latest version of the popular PCMark series. PCMark05 is an application-based benchmark and a premium tool for measuring overall PC performance. It uses portions of real applications instead of including very large applications or using specifically created code. This allows PCMark05 to be a smaller installation as well as to report very accurate results. As far as possible, PCMark05 uses public domain applications whose source code can be freely examined by any user. 

Info and download - Download!

With PCMark05 we can see the difference getting a little higher already. Most people will have 800 MHz memory. Notice there's a good 200 MB per second differential from that memory towards the memory overclocked at 1066 MHz.