Both of these go for about the same price:
Sapphire HD5450 chipset , HDMi ready , support Hyper Memory upto 2.8Gb , Silent heatsink only + extra Low-profile pci bracket , DirectX 11 , built-in HDMi codec+7.1 audio , pci-e 2.0 x16 , 1Gb 64bit DDR3 upto 2.8Gb hyper memory , RoPs : 4 , 12.8Gb/sec memory transfer , 80 stream processors ( pixel shader engine + vertex pipelines ) , core/memory : 650/1333mhz , dvi+d-sub+hdmi , HDMi+HDTV-out - retail pack
http://www.sapphiretech.com/presentation/product/?cid=1&gid=3&sgid=917&pid=316&psn=&lid=1&leg=0
Sapphire HD6450 chipset , Silent heatsink only , HDMi ready , DirectX 11 , built-in HDMi codec+7.1 audio , pci-e 2.0 x16 , 1Gb 64bit DDR3 , RoPs : 4 , 12.8Gb/sec memory transfer , 160 stream processors ( pixel shader engine + vertex pipelines ) , core/memory : 625/1333mhz , dvi+d-sub+hdmi , HDMi+HDTV-out - retail pack
http://www.sapphiretech.com/presentation/product/?leg=&psn=000101&pid=1166