If you want the fastest classic memory, you have to build it yourself or get a expert to build it for you.
I own the fastest 72 pin EDO memory in the world ( 4x 128MB ) 28ns, speed binned with every error I can detect removed.
The EDO memory I have here, was built from the out-set with the lowest timing in mind. I could do the same to any classic memory, but it cost a lot to get it right.
Now working on DDR1, but I have ran into problems, no access to TCRD.
