I am upgrading the speed of a Performa 575 logic board in my Coloc Classic Mystic. Usually the VRAM SIMMs are 80ns. I need 70ns. Here is how you can tell the speed:
"If you get the 80/40MHz upgraded LC575 logic board, you need 70ns VRAM
or faster, otherwise you end up with a black screen. The speed of the
VRAM SIMM is printed on each chip, e.g. part numbers ending in "-10"
means 100ns and are too slow, "-8" or "-80" means 80ns and are fast
enough for the 66/33MHz version fo the LC575, but the 80/40MHz version
would need chips with part numbers ending in "-70" or "-60".
If you have two to sell me, please let me know. I am in the USA