I could be wrong about this but I was told that any card which has a 'cable' from the board to the VGA/DB15 plug is only doing a clone image.
I think you may be wrong about this (although apparently correct about the EAX300SE-X having a single RAMDAC) :
Notice that both these X300SE have the cabled VGA connector (because of the half height PCB no doubt) Now look at the DVI connector for each card. Sure enough, the EAX300SE-X has a DVI-D connector, and the EAX300SE/TD has a DVI-I connector. Obviously, ASUS has pulled an 8500Le and ommitted a RAMDAC (dang, I thought both RAMDAC were intergrated into the core) for a measely $3.50 some buyers are going to get burned thinking they are buying a dual head video card. Neither ASUS page, nor the Newegg product pages identify it as a dual connector Single head card either.
Leave it to ASUS to Fark up another video card, christ now you'll have to be very careful picking a dual head value card
.......I wonder how many others there are?
EAX300SE/TD
EAX300SE-X