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The Radeon 4770 does not look like much at first glance. Its model number correctly implies that it is somewhat slower than the Radeon 4850, and yet the Radeon 4770's lowest price is $109.99, $20 dollars more than the least expensive 4850s. The 4770 is not clocked high and does not offer more memory. Why would anyone buy the 4770?
Well, the Radeon 4770 has a secret. It is the first GPU by ATI to be made on a 40nm manufacturing process. Just as in processors, a smaller manufacturing process means a general reduction in power consumption and thus heat output for any given chip. This holds true with the GPU powering the 4770. While slightly slower than a 4850, the 4770 is incredibly cool and quiet. At load, it consumes less power than any other modern full-sized video card.
These are traits any HTPC builder will find valuable. Granted, the size of the 4770 limits its applications. This is as high-end as most HTPC builders are going to want to go. However, for those who need or want a high-end video card for their HTPC there is no other card better suited for the role.