Hello all! I'm intended on going with XFX Geforce GTS 250 512MB CE. However after being here http://xfxforce.com/en-us/products/graphiccards/gtsseries/250GTS.aspx and seeing all those YDFC-YDFR-YDFU-ZDFU-ZSL4 models, I'm kinda got confused. Which r the differences beetween these types? Regards.