When it came to Linux gaming and exploring the 32-bit versus 64-bit performance with the AMD Phenom, in most cases Ubuntu x86_64 was slightly slower than the 32-bit version. The only test where the 64-bit OS had a strong advantage was when running Quake 4 SMP at 1680 x 1050 with ultra quality settings and then it was able to shine. As would be expected, in both LAME encoding and Gzip compression tests the 64-bit version of Ubuntu on the AMD Phenom 9500 with an AMD 790FX motherboard was the leader. These tests are not meant to be all-inclusive or try to convince you to stick to 32-bit or 64-bit Linux, but simply publishing these results per reader requests. If you are trying to decide between a 32-bit or 64-bit distribution, a whole lot more comes into play than just the benchmark results but there is binary software compatibility issues (leading the pack is Adobe Flash) and other matters to consider. For more information, check out the Phoronix Forums.