In the past, manufacturers referred to the memory clocks with double (or quadruple) their real clock rate, because DDR and other technologies based on it (DDR2, GDDR3, etc.) allow the memory chip to transfer two data blocks per clock cycle, while GDDR5 memories allow the memory chip to transfer four data data blocks per clock cycle. The Radeon HD 4890 and HD 4870 1GB were also even, coming in at 4X MSAA. The GeForce GTX 275 and GTX 260 were evenly matched for settings, both capable of 2X MSAA at 2560x1600. It is important to note that beginning in 2007, both AMD (ATI) and NVIDIA started referring to the memory clock of their video cards with the real clock rate used. The NVIDIA GeForce GTX 295 allowed 8xQ MSAA, and the GeForce GTX 285 handled 4X MSAA. To facilitate knowing and understanding the differences among these chips, we have compiled the table below. Below that we have GeForce GTX mentioned and across the bottom we have a bit of information on CUDA along with the model, being 275 and some of the main features like 896MB of GDDR3 and a 448-bit bus. If you don’t follow the video card market almost daily, it is really complicated to understand the differences between the several different NVIDIA graphics chips available on the market today. Not only do you have ATI’s new Radeon HD 4890 1 GB sliding into the 249 price point, but Nvidia is also launching its GeForce GTX 275 at the same price, set in between the GTX 285 and GTX 260.