friends i thought of buying amd raedon 6670 gddr5 1gb,my motherboard is intel dg31pr ,i want to know wheather pci e2.1 x16 cards are supported in pci e 2.0x16 and also wheather gddr5 is supported or not .i also had a second thought of buying amd raedon 5670 gddr5 1gb(because both of them doesnt need 6 pin connector),you can also suggest cards which run on 450w 4pin or without 6pin