BigBudz :
and i just looked up my gddr2 ram, it exists, and the only diff between them and reg ddr2 is that the gddr2's create more heat due to running at a higher clock rate.
There are many differences between DDR1/2/3/4 and GDDR2/3/5, here are a few of them:
1- GDDR tends to run at much higher frequencies, about twice that of similar generation DDR
2- GDDR has much higher latency, 3-6 cycles longer due to deeper pipelining in the row register multiplexer
3- GDDR has different clocking requirements than DDR
4- GDDR has different data strobe signaling from DDR
The last two make GDDR physically and electrically incompatible with DDR control circuitry. Since no standard CPU/NB memory controller was ever made to use GDDR AFAIK, there has never been such a thing as GDDR DIMMs in recent history. You have to go back in time about 12 years for the last consumer cards that had proprietary DP-RAM or GDDR DIMMs for aftermarket upgrade.
There has never been such a thing as standard GDDR1/2/3/5 DIMMs.