Here is a review of this amazing graphics card which is somewhat usual to one’s ears.

Sapphire is one of AMD’s premiere card partners often releasing some of the most unique, overclocked and customized cards before other companies. The HD 5770 Flex card is another iteration of this trend.

source: http://www.pcper.com/article.php?aid=988

Differences between these cards are obvious. Let one of yahoo!answers users answer this defferences.
source: http://answers.yahoo.com/question/index;_ylt=AsftzUq3Ff.CUu9UzGDX20AjzKIX;_ylv=3?qid=20100406140610AAxi4t2

An affordable but powerful graphics card for gaming enthusiasts. This item is sold for 129.99 U.S. dollars with two years warranty from the date you purchase this product. Click the link below to know the specifications and features of this amazing product.

read more: http://www.cdw.com/shop/products/default.aspx?edc=1714812&cm_mmc=ShoppingFeeds-_-Pricegrabber-_-Video/Monitors/Cards/Projector-_-PNY%20XLR8%20GeForce%20GTS%20250%20Video%20Card_1714812