Yes - ATI Tool seems not to work with changing the clock on x1400 at all. If you're locking up, that's the problem.
Also, thanks for the info about what memory artifacting looks like - I had thought those black seam-lines were just shoddy modeling!
Guess I must have been playing with the mem clock up a bit too high - but to be honest the black jagged lines didn't exactly have any great effect on my gaming experience - any idea if running above levels where the video card is stable is harmful?
i.e. where on the following chart does your video card start to get damaged or start, and where on the chart does it just start to deteriorate little by litte:
normal clock speeds
unstable but sustainable overclock
unstable overclock that leads to crashing/lock-up, but you power down right away
unstable overclock that leads to crashing/lock0up, and you just let it sit there
waaaaay higher clock speeds than you could possibly handle
I assume the "danger point" starts at "unstable overclock that leads to crashing/lock-up, and you just let it sit there", but I could easily see that it could start at "unstable overclock that leads to crashing/lock-up, but you power down right away", although I hope not
it's kind of unavoidable when you're trying to get optimal cock-speeds to crash to white-screen or freeze once in a while.
And I really hope there's no danger in "unstable but sustainable overclock" - better make sure you check extra hard for artifacts! And if "stabile overclock" causes detioration... well, if it did, I guess nobody would overclock, so I assume it doesn't
. I wish I knew more about the architecture of video cards - why would they necessarily deteriorate over time, so that a clockspeed that's stable today might not be stable a year from now? Corrosion? Corruption? Melting?