The differences between the two 5900 variants are actually rather small and so can be encapsulated now, rather than in some lengthy explanation. The Ultra model has 256MB of onboard RAM and a core clock speed of 450MHz, whereas the standard version comes with 128MB of RAM and a clock speed set to 400MHz. Other than that, the two products are exactly the same. However, many vendors often choose to enhance their editions with additional features so we shall take a closer look at the Asus V9950s.