Further to my earlier post this thread, SRX660, when I read the link you provided to AMD processor timing, my brain swelled up, blocking out the sun for several days!! However, after the headache subsided, I went back to the article once again, this time with renewed vigor. This is what I've learned so far: the two 512 Mb sticks are timed at something like 2-6-6-5. The two new sticks, the 1Gb ones, are timed at 3-3-3.
I tried removing the 512's and inserting the 1Gb's into the DDR-1 and DDR-3 slots on mobo. The machine runs, however the graphics on Flight Simulator 2004 went crazy....looked like the AGP was trying to "draw" both wide angle and extreme close up zooms at the same time.
Being properly spooked by this behavior, I shut it down, unplugged power, and swapped the 1Gb's for the 512's. When I rebooted, everything was back to normal, including the graphics in FS2004.
So I'm back at square one.
Edited by bushp04, 18 December 2006 - 04:26 PM.