I have had problems flashing a FireGL X3-256 with Samsung memory chips. I have tried in both a PC and a PowerMac G5 1.6MHz
Flashing in the PC - tried both the X800 and FireGL reduced ROMs from The Mac Elite. All I get is a completely blank screen. I have modded the X800 ROM to DID 4A4D and tried that - same result. I have modded the FireGL ROM to DID 4A48 and tried that - same result.
Flashing in the Mac - I tried using Graphiccelerator, followed all the directions, and when I fire up ATI Multi Flasher, it comes up with a confirmation screen saying:
card rom size (00010000) < new rom size (0001E200)