Hi guys, My work machine is an "Early 2008" Mac Pro (3,1) that originally came with one 2.8GHz quad-core Xeon. I added a second one, so there are now 8 cores. The rest of the specs are: -OS 10.8.2 -OWC Mercury Electra 3G 120GB SSD boot drive -Three more internal HDDs, two of them RAIDed -8GB (8x1GB DIMMs) 800MHz RAM -Two video cards: the original ATI Radeon HD 2600 XT that came with the machine, plus an ATI Radeon HD 5770 that I added to get FCPX working -Two monitors, both plugged into the stock Radeon 2600 (plus assorted other crap like an eSATA PCIe card, etc.) FCPX currently runs on this machine, but it runs like complete crap... it is slow as hell. I have to edit everything (even DSLR footage) in "proxy" mode or else FCPX will lag and freeze, and exporting finished videos out of FCPX is so slow it is impossible (instead I send finished videos to Compressor, which actually seems to encode them pretty quickly... full HD, 1920x1080 compressed H.264 in almost real-time). While we're all waiting for the new Mac Pro to come out (crossing my fingers) I want to 1) figure out what is limiting the performance of my system* and 2) do whatever upgrades are reasonable to get it performing well. (*: In general my system performs pretty well... I can work with 2GB Photoshop files with fifty layers without problem) I understand FCPX is a RAM hog, so probably the first thing to do is install more RAM. But I'm also wondering if the video card(s) is(are) an issue. I bought the Radeon 5770 when FCPX came out because the Radeon 2600 was incompatible with it (maybe a lack of OpenCL support, I guess?). Is it possible that somehow FCPX isn't using the processing capacity of the 5770 correctly? Is it possible that by leaving the old 2600 installed in addition to the 5770 I somehow tricked the machine into not using the 5770's processing capacity? At the moment I'm considering A) buying a bunch more RAM for this machine B) removing the old 2600 video card and C) upgrading to the Radeon 5870. What are people's thoughts? How could I best configure this machine for FCPX use? Thanks very much in advance for any help.