While the current GeForce 7800 GTX is clocked at 430MHz with 1200MHz memory the new 512MB RAM version will feature a clockspeed of 550MHz with 1800MHz memory!
We know that new Nvidia card is a very much tweaked original G70, Geforce 7800 GTX PCB design and this time the card will work at a magnificent 550MHz core and at 1800MHz memory. Nvidia felt threatened by the X1800XT and therefore decided to use new Samsung memory. You can find details about this memory here. However, we are not sure whether Nvidia will use an exact 1800MHz clock but should be close to this number.The upcoming 7800 GTX 512MB will feature a dual slot cooling system and will likely be launched within a week.