That sounds strange, I currently own a Radeon HD 3650 and a Radeon HD 5450 both with 512M of VRAM. This submit makes the latter use 1024M of GART memory while the first remains with the old default of 512M. Wouldn't the 3650 benefit at least the same from the extra GART memory as it's faster and has the same amount of VRAM even though being an older generation?