On my Power Mac G5 2x2.7, I removed “default” 512Mb and installed Kingston 2Gb instead, but I didn’t notice any performance improvement in terms of audio tracks/plugins quantity. I did a test project: 38 separate and simultaneous audio tracks (stereo 24bit/48khz) and approx. 88 Platinum Verbs. Buffer size = 64. If I add one more Platinum Verb or one more Audio track, then Logic stops. So, after installing 2Gb instead of 512Mb – I have the same performance as with 512Mb: the same possible 38 tracks/88 plugins. Again, adding more tracks or more plugins “stops” the Logic. Another test project includes CPU-heavy “Sculpture” preset. With 512Mb, I hear clicks and pops, if I play more than 5 notes simultaneously. So, here is exactly the same situation with 2Gb installed… Buffer size = 128. Am I missing something? It seems strange that 2Gb RAM didn’t change anything. Thank you for your help! GK System: Power Mac G5 Dual 2.7 Ghz RAM: Kingston KTA-G5400/2G (kit of two 1Gb modules) System HD: Seagate Barracuda 7200.8; 250Gb Audio HD: Seagate Barracuda 7200.8; 250Gb RME HDSP 9652 on PCI-X slot -> Apogee Rosetta 800/96 No other PCI devices OSX 10.4.2 Logic Pro 7.1.1. Apple Pro Application Support installed