Des tests comparant Windows XP SP1 et XP64-bit ont été effectués, les résultats sont plutôt décevants. On constate une diminution des performances allant de 4% à 51%.

As you can see, the standard benchmark games under XP64 Preview were 4% to 51% slower than 32-bit, with the average speed about 20% slower. It is far too early to reach any conclusions in this area, but there is a lot of driver optimization to be done to make up this kind of delta. With the CPU and memory providing faster 64-bit performance, we have to believe the drivers play a big part in this disappointing gaming performance.

Espérons que ce n’est que provisoire, et qu’une amélioration des drivers améliorera effectivement la performance du 64-bit.