mmmmmmmm I don't see anywhere it says that BIOS is intended for the 256MB version of the 1800xt. I bet it's for the 512MB version. I'd contact Sapphire first to see if they have a new version for your card.
From what I've read so far today this BIOS should work on all 512MB cards. It wouldn't be a bad idea to use ATI Tool to OC to 700/800 first to make sure it can handle it, but if it was me, I'd go ahead and flash it and if I get artifacts or something, flash it back. Just make sure to dump your BIOS before flashing so you have a backup.
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