You know, I'd completely forgotten I'd posted on here..

Anyway, I've replaced the 2 gig sticks of generic ram with some quite fancy OCZ PLATINUM PC3200 (OCZ4002048ELDCPE-K) memory, sticks on my Dual G4 1.42 MDD, the results are:

Ram Disk:> memtest disable
Allocated memory at 0x22D1EE40 -> 0x5C8495FF, 968009664 bytes
Writing and Verifying 0x00000000...
Write 697 MB/sec. Verify 394 MB/sec.
Writing and Verifying 0xFFFFFFFF... Write 697 MB/sec. Verify 394 MB/sec.
Memory is ok!

Which is idnetical to other stuff Well live and learn..