Expreview claims NVIDIA's new GeForce GTX 275 graphics cards are selling poorly due to the GeForce GTX 260:
Well, what has resulted in the poor sale of GTX275? We don’t think it’s HD 4890. However, GTX260 should be the major reason. Several manufacturers chopped GTX260 price greatly last month, and you may get it at around $169 bucks. Though GTX 275 brings 13% performance improvements compared with GTX260 according to our benchmark, lots of users still prefer to choose the latter one with attractive pricing and decent performance, which has put great pressure on GTX275 sale.