Originally Posted by dellbert
Why is that? I thought GDDR3 took more due to the internal termination. You can run DDR1 at lower clocks without needing external termination (and it has no internal termination), so it runs more efficiently.
I can't remember the technical explanation behind it, but I am sure that GDDR3 produces less heat and consumes less power to run at the same frequency as DDR, thuss allowing it to be clocked much higher. In effect, the higher clocks we see in the GDDR3 modules do lead to an increase in heat and wattage of the memory, but clock for clock they run cooler.
THis is similar to the DDR2 system RAM modules. DDR2 533 is actually a little slower than DDR 400 due to increased latency, but has the ability to run cooler and with less power, which is its main advantage esp. in mobile applications. As far as I undersatnd, GDDR3 is just more of the same.