How much difference is there between GDDR and regular DDR? I think that GDDR runs at higher voltages and temps than regular DDR. I'm assuming if GDDR5 is available, then it's kind of inevitable that regular DDR 5 would be coming at some point.
I thought the main difference with graphical RAM was that the monitor output DAC could read from memory at all times, regardless of what the GPU is doing with it. And GDDRn is not the same generation as DDRn; the last GDDRs (4,5) have been based off DDR3, I think.
Graphics RAM was dual-ported (=two readers at the same time) in the early days, but hasn't been for a long time. The concurrent accesses are managed by the GPU internally now.
