I am doing the 20Mhz crystal upgrade to my 575 logic board. But I have been unable to find any 512K, 68 pin, 70ns VRAM SIMMs.  All I can find are the 80ns versions.

I had intended to look for a full 68040 running at 40Mhz.  But I know I can't run that processor now because my VRAM SIMMs are to slow at 80ns.

I do have a Motorola XC68040RC33M.  I suspect it will run at 33Mhz, not 40Mhz.  Will my 575 logic board with two 80ns VRAM 512K SIMMs run the video OK?  Or do I have have to drop to a slower CPU?

Thanks

jack