I'm in the process of upgrading my 3,1 (2x2.8GHz quad-core) and these forums have been extremely helpful. The first upgrade was to go from 4GB to 8GB RAM - completed yesterday. I am currently running OSX 10.5.8 and 10.6 is en route. I'm wondering if I should move to 10.7 as soon as I have 10.6 installed or wait for 10.8, skipping 10.7. It seems that the direction I go with the graphics card will make this decision for me. My next step is to upgrade the graphics card. Currently installed is the Radeon HD 2600. I've been reading a number of threads and trying to figure out what is current information that applies to the 3,1. Obviously the easiest solution would be to drop in the 5770 from apple, but at $250 it looks like there are more cost effective solutions. I'm trying to find the ideal balance between cost, performance, longevity and compatibility. I saw in another thread regarding upgrading a 3,1 that this GTX 560 should drop straight in. How do I tell what cards would be a straight drop in, vs requiring flashing? From what I can gather from a variety of threads is that w/o being flashed the boot screen and several programs will not work. Is this still current information with the most recent version of 10.7? In all honesty, how difficult is it for a reasonably intelligent person with limited computer hardware knowledge to flash a video card? I would like to avoid it, but if the specs vs. cost make it nearly a no-brainer to go that route i'm not going to rule it out yet. How can I tell if a card will work in my machine? For example, the GTX 560 I linked had a rebate that would have had me purchasing the card at the time it was posted, but the rebate is no longer active. How do I tell if a card that I see for a good price is a straight drop in? Are all GTX 560's?