http://www.dell.com/content/products/productdetails.aspx/dimen_c521?c=us&cs=22&l=en&s=dfh
im not really sure what the card is but my dad said it would help i know its Radeon PCI something srry not very god please help>
The Dell C521 is a low-profile slimline PC. It will not take full-height expansion cards.
In any case, the only reason to add a PCI tuner card is if you want to use your PC to receive a TV signal so you can use the PC to watch or digitally record TV. If you aren't going to do that, there is no reason to add that card.
Personally I think PC tuner/capture cards are not that useful-- There are none on the market right now that can tune into QAM-encrypted premium digital HD 1080i programming anyway, so you can't watch channels like Discovery HD, HBO HD, CNN HD, etc. on a PC. You can watch standard-definition channels, but I'd rather just do that on a regular TV.
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