Synthetic Benchmark Results
The difference in performance is marginal.
SiSoft Sandra 2005 Pro
Here we have the explanation for the WinRAR results : the GeiL memory is slightly faster, but only because all four DIMM slots leads to a system memory bandwidth impact, as 2x 512 MB is as fast as the 2x 256 GeiL memory.
Note that in a normal scenario using two DIMM slots would allow you to use the faster 1T command rate. This isn’t possible when filling all four DIMM slots with the nForce4 motherboard we used, thereby resulting in a 2T command rate, which is between 1-4% slower in most real-life applications. For our tests, however, we used 2T with all memory configurations to single out system memory size as the sole factor that impacted performance.
While the 512 MB GeiL system memory takes a hit during the 256 MB data shuffling in the Combined Index, it also outperforms the Corsair memory when it comes to Speed Factor.