128-bit 512MB DDR2
When the Radeon HD 4650 was originally released, it didn't draw a lot of attention. It was easily overshadowed by it's big brother, the HD 4670, which only cost a few dollars more. Now that it has hit the $50 price point however, the HD 4650 has become the best budget option by far.
The HD 4650 and HD 4670 are based on the same chip, and have many of the same features.The HD 4650 has a slower core clock than the HD 4670, and it uses slower DDR2 RAM, whereas the HD 4670 uses GDDR3. This translates to noticeably slower performance than the HD 4670. Another attractive feature of the HD 4650 is the extremely low power requirements of the card. It doesn't need any additional power connectors, and it can be run on 300watt or lower power supplies.
This little powerhouse of a card is suitable for graphically intensive games at medium settings, at resolutions up to 1440x900 or higher, depending on the game. At higher resolutions, the slow memory may become a factor, and begin to cause lag and stuttering. Overall, no other video card comes close to the HD 4650 at the $50 price point.