After posting my AMD Athlon64 vs. Sempron comparison last week I was still puzzled to why the overclocked Sempron 3100+ was able to easily out perform the Athlon64 3200+ in all the synthetic tests but not the real world tests. A large number of readers also thought this was quite strange, so I spent most of this week trying to find out why. The problem seemed to be the Gigabyte K8NSNXP motherboard which featured an out-dated BIOS version. While the board did detect the Sempron 3100+ processor, the board?s 3D performance when using the Sempron was for some unknown reason quite poor.