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Just don't. Save the chips for the board that need them as 9000 chips are nowhere to be found either.
All 512MB 0005 boards you can just slap a 9000 on there and it should work. On 1GB board you will need to change the VRAM chips so fuck that.
I want to do it as I have just now a board with 512MB Samsung I put 9000 and white screen. Is there something that I can change and get it work? Any idea?
I have no idea. Compare strapping resistors between 9000 and 005 boards. R8613 and friends. I think 0809000 is only properly supported in the early 2011 BIOS so you can only downgrade early 2011 models.