Difference between Sam ep and Sam flex?

[klx300r]

I'm gonna be getting a Samantha flex soon but would like to know the main differences between the ep & flex versions of Sam :-)

[klx300r]

thanks for the reponses guys!..ya I'm gonna go for the flex ..can upgrade video card, more memory and pci slots sells it for me :-)
now i'm not sure about going for the overclocked 733 mhz version?? over all durability etc. I liken it to adding a supercharger to your little 4 cylinder engine..surew she goes faster but after a while that bugger gives you alot of headaches !