Gigabyte's iRAM, OC.com has comment on the initial review
 

No doubt the results will be very disappointing to those with unreal expectations (actually, they're somewhat worse than I expected.)
The price tag is also a bit disappointing, the initial models will cost not $50 or $80, but $150.

Future Fixes?

There are some reasons for iRAM's relatively disappointing results:
• Throughput is bottlenecked by the SATA 1 bus speed.
• Software/hardware is not properly optimized for high throughput
• Some software is so well optimized to use hard drive and Windows caches that they're mostly being read from memory, anyway.
• For some operations, it just takes the CPU a good deal of time to get the work done. It's not just a matter of file transfer.


more @ http://www.overclockers.com/tips00813/