you shoudl always do smaller increases when overclocking anything. Graphics cards like 10mhz increases, then once you find your ceiling, you drop it 5mhz. Push the core to its ceiling and drop it 5mhz, then do the same thing to the memory. Make sure after every 10mhz increase, you do the artifact scanner on ATI Tool for 1-2mins. Really stressing the card. IF you get a bunch of artifacts, then drop the clock 5Mhz and repeat the scan. If it does it again, drop another 5mhz.Â
The reason for small increases, is the card just likes that. It likes to be pushed a little at a time. Remember Happy Gilmore...."Just tap it in, just tap it in...tap tap tappy an old tapparoo" A big push and the card freaks out, frequencies mess up and generally, cards and PCs dont like that together. PSUs also factor in when overclocking the GPU. Cleaner power, means more power to the card and can handle the new load.
Its better to overclock on aftermarket aircooling, where your ceiling will be much higher. Also having good cooling helps. If the PC crashes or gets funky colors on it. Then restart the whole PC. Start over, you know you have gone too far. So with your 40mhz increase, you have hit the ceiling, so drop it by 5-10mhz. Then work on the memory.
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