Not my benchmark, but from the page: The Dual Athlon 2600+ (2.1GHz) system had 1GB of DDR memory and ran Windows XP. The Dual 2.4GHz Xeon system had 2GB of PC2100 DDR (cas 2) memory and ran Windows XP Professional. (Hyper-threading was enabled.) The 3.0 GHz Pentium 4 system had 2GB of 400MHz PC3200 DDR memory and ran Windows XP Professional. (Hyper-threading was enabled.) The Apple Power Mac G5 models were borrowed for testing from anonymous sources. They were running Mac OS X (10.2.7). The Dual 2GHz G5 had 2GB of PC3200 DDR. The 1.6GHz G5 had 1.5GB of PC2700 DDR. The 1.8GHz G5 had 2GB of PC3200 DDR. All machines had radeon 9800 pro retail 128MB cards. As for bus speeds, I am unaware for the PCs The G5 1.6Ghz single has to have an 800mhz FSB The G5 1.8Ghz has a 900mhz FSB The G5 2.0 dual has twin 1Ghz FSBs. For hard drives, I also do not know about the PCs. The 1.6Ghz G5 most likey had an 80Gig SATA 7200 RPM The 1.8 and dual 2.0 G5s most likely had 160 GIG SATA 7200 RPM drives. Remember that the Mac is more optimized, and may acheive more power with a slower cycle. Also consider that the G5 processors are 64-bit, as opposed to the athlon in thius test which is a 32-but processor. Even though bryce is not 64-bit aware, the cpu bandwisdth is greatly increased. Apple did label the G5, when it was released, as "the fastest supercomputer in the world." It seems that these claims are not entirely without evidence. I can't validate the accuracy of the tests, but I can say that the guy in charge of the barefeats.com testing site is not out there to give false info. The G5s do not beat the PCs on all tests. And as far as games, the PC systems are usually at least 30-60fps faster than a comparable mac with the same graphics card. You don;t have to believe it, or trust the guy. I happen to trust him, but that's just my opinion. It is his job.