I do service work for Dell and took the DCSE test for this machine. Although I haven't had to work on this machine yet, the guides I have say a VRM must be installed for each processor. Here is a small picture of the system board. Picture
The tuner that is on the card is for Cable/Air ONLY. You can not change channels from the card when using DirecTV. If your receiver is in another room, a RF remote (if you receiver supports one) would be nice to have.
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