The 8800GTS has 128SP. Maybe these are rebadged 8800GTS chips as 9800GT chips? Nvidia rebadges everything these days, makes as much sense as anything else. I wonder when they will release something new? (other then the GTX chips)
At first I thought it was a Newegg typo, but after reading around a little bit, apparently Asus is just doing strange, confusing **** (similar to that 9600 GSO "Magic" poo). That's almost completely a plain 9800GTX, so why they call it a GT is beyond me. The only differences between a 9800GT and 9800GTX is the 16 shaders, dual-slot cooler and clock speed... and uh... that has all three except it's memory clock is 200Mhz shy of a reference GTX.
Perhaps a way to use slightly lower-binned GDDR3? Asus creating it's own spec of card and calling it an existing card + vague modifier is confusing for most people and I'm surprised Nvidia allows it, but aside from all that, it's an excellent card for an excellent price. Scoop up a pair and be happy.