The SG ram is especially made for display adapters i think. I do know for a fact though that there is no difference between there performance. In terms of o/c i have had better experiences with cards that have SDRAM.
The new ram comming out DDRRAM (Double Data Rate RAM) will make things much quicker as it doubles the transfer rate of data per clock cycle. Therefore things theoritically should be done twice as fast or even faster depending on what effect the cache has. This RAM will feature on some Ge-Force boards.
[This message has been edited by Luke-Skywalker (edited 10-06-99).]