i have just sent my 280x back for rma and been told i will get a refund as it only laster 6 days 
so i now need a new card. when i had the 280x i found it ovew kill for the games i played so i am looking at a different card. what is the R9 270x like and is there any need for the 4gb model
http://www.overclockers.co.uk/showproduct.php?prodid=GX-328-SP&groupid=701&catid=56&subcat=1982
vs
http://www.overclockers.co.uk/showproduct.php?prodid=GX-327-SP&groupid=701&catid=56&subcat=1982
also if i get a GTX what would be the same ish performance as the R9 270/280

so i now need a new card. when i had the 280x i found it ovew kill for the games i played so i am looking at a different card. what is the R9 270x like and is there any need for the 4gb model
http://www.overclockers.co.uk/showproduct.php?prodid=GX-328-SP&groupid=701&catid=56&subcat=1982
vs
http://www.overclockers.co.uk/showproduct.php?prodid=GX-327-SP&groupid=701&catid=56&subcat=1982
also if i get a GTX what would be the same ish performance as the R9 270/280