Cheaper
The top notch R700 comes with 2GB GDDR5 memory, but AMD will
allow its partners to build a GDDR3 based version of the card. Such a board will
be cheaper and faster to market.
This configuration will include 1GB GDDR3 memory and two
RV770PRO chips and since the partners will be allowed to build these boards
there might be a chance to some of the AIBs might come with its own cooling
solution.
Such a board
might have a chance to come in August but it looks like that this particular
version might come a bit later. R700 with GDDR5 has a big chance to start
shipping as early as mid-August, but a fixed date has not been picked yet.