P4 2.8/8001024 PC3200P4P800 Deluxe9800Pro ATI/ Omega 3.10When overclocking the FSB beyond about 233 I get trapezoids, squares, and bars that flicker rapidly above the horizon in both full-screen and window mode. The flicker rate is about 10/sec. This occurs regardless of screen resolution, AA, ATI overclocking, etc. The only common denominator is the FSB. I have the AGP/PCI ratio set to 66/33 and memory, CPU, and AGP voltages are all default. This does not appaer anywhere else other than FS9 (although I don't run other games on the PC) and the system is completely stabile and cool at FSB well above 233. Memmory timings are 3-4-4-8-8 (very conservative).Any ideas?

Strange! Are you running the latest BIOS? Also, what divider do you have set for your memmory? Maybe it can't handle 233Mhz despite the relaxed timings.You could always try and increase the voltage of the R9800 by just a little.

The memory is running 1:1, but I don't think it is the dual DDR that is giving me fits.The P4P800 Deluxe allows AGP voltage to be increased in 0.1V increments, but I'm hesitant to do that. What AGP voltages have people safely been running?

I upped mine by .1, it works fine.Try changing the RAM down and run it 4:3 instead of 1:1.I have no problems running my FSB @ 250Mhz

I'd try it, but I don't see where my BIOS offers the 4:3 split that I've seen on other boards. The only DDR speed options that I see are 400/320/266. Would setting it at 320 acomplish the same? My P4P800 Deluxe is running the 8/20/03 BIOS update (the most recent).More experiments have shown something else: by using the board's one-step o/c setting of 20% (240 FSB) FS9 runs fine, but if I manually set it to 240 then I get the flickering artifacts. Hmmm...

400Mhz is 1:1, 320Mhz is 4:3 on these boards.