I only have 768 and the GW mod runs fine.
But you MUST use the stock sea floor text that comes in the option folder in pack two. It is imparitive that you use or you FPS will drop substantially, mine did. Discovered the sea floor is rendered at all times, put the stock one in, FPS just fine
Definatly something for you to give a go. New models new graphics new sounds its a complete re-overhual and very well done!