Putting files into ram didn't seem to work, but after taking out 1 of the 1GB sticks of ram out:-

Ram Disk:> memtest disable
Allocated memory at 0x23D81740 -> 0x5C85E5BF, 950914688 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!