True, but you can do hybrid crossfire or hybrid SLI using the UMA chipset along with a discrete GPU card. Not as robust as full SLI or Crossfire, but certainly improves performance over UMA graphics alone.
However, with the upcoming chipsets, discrete cards may not be needed for most HTPC applications.
Hybrid CrossFire/SLI is good for a low-end to midrange card (e.g. HD 2400 or 8500 GT) where reasonable performance increase is seen. However performance boost is almost negligible for a high-end card as shown in the following figure:
Low power consumption mode (switch off the graphics card and use only IGP) is very good, however. It's ideal for a HTPC gaming machine.
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