Ok. Well back in February 2008 I bought an extra 4 gigs of memory for my 2008 8-core Mac Pro, bringing her to 6 total gigs of memory. I ran XBench back then, and had a total score of 183.06, memory test was 189.99. The "User Interface Test" came in at 388.27, as opposed to 311.12 with 2 gigs of memory under 10.5.1. So yesterday I ordered 2 sets of 4 gigs of memory (2x2) which would then bring my Mac Pro to a total of 14 gigs of RAM, with the two 1 gig sticks from Apple in slots 1 and 2 (closest to the connector) on the top riser. Everything else is populated with 2 gig sticks. I just ran XBench again (admittedly I didn't check online for a new version, maybe Snow Leopard capable idk...) Anyhow, My total score was 104.22, with a User Interface score at only 37.05, dragging the whole thing down. memory test was 203.58. I am confused here... And somewhat melancholy. *** For comparison, here are the Geekbench results: 6 gigs, 32 bit - 7793 14 gigs, 32 bit - 10093 14 gigs, 64 bit - 11265 Also, strangely people with 10 gigs of memory had higher scores than me on Geekbench. Must be some other factors at work there. But for the life of me, I can't figure out those XBench results.