The hardware we had used for these Ubuntu 7.10 and Fedora 8 benchmarks consisted of an AMD Athlon 64 X2 4200+, 2GB of A-DATA DDR2-800 memory, Abit NF-M2 nView motherboard, Seagate Serial ATA 2.0 hard drive, and an ASUS GeForce 8600GT 256MB graphics card.
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The bottom line is with our hardware we had used and these common Phoronix benchmarks, the performance of Fedora 8 and Ubuntu 7.10 was deadlocked. There was no clear winner. If you are trying to decide between taking the Ubuntu or Fedora route, you're best off looking at the distribution's features and what they mean to you. More information on both Ubuntu 7.10 and Fedora 8 can be found in a number of other Phoronix articles.