i did have a look on the antec site before i posted but it confused me
i looked at the antec sonata's PSU data sheet and saw 20 pins. but at another point it mentions that it is compatible with PCI express mobo's.
i thought PCI express require the 24 pin variant of PSU's, so that confused me
i came across posts on another forum where you can use 20 pins on 24 pins but you got to know which 4 pins to leave out. i also came across a post where some one had actually fried his mobo