GDDR3 only

We wrote that RV770XT supports 512-bit here and now we have learned that the slower RV770PRO will only support 256-bit and it will use GDDR3.

It looks that the current GDDR5 design sticks with 512-bit memory interface and that RV770PRO will use 256-bit GDDR3 memory. The RV770PRO will need a smaller cooler, as it is definitely going to end up the cheaper of two, and you can bet on a sub-$200 price.

RV770PRO will also end up with a slower clock than RV770XT, but we still don’t know what the current speed plan. It is sampled and it works, at least the RV770PRO with 256-bit GDDR3 does.