SLI it or not ???

first , txs all 4 having me on your forum .
Question : running a Evga 7600gs 512mg card . should i SLI it ? can i really expect more performance etc ? will it then be 256 interface ?
Or , send the card back @ a 15% restock fee & get the 7950 /512 mg evga card ??? i'll have to wait months till i could SLI that baby . Yes my power supply has the guts and hook-ups to do it all right ???
running a 4800x2 on a gigabyte sli 4 mobo . 2 gigs of samsung 4300 .
txs 4 all and any answer's

didn't know the 7950 had driver problems , txs 4 input . i could go with 1
evga 8600gts but then a wait of many months to sli it ! hadn't thought of the 7900 . go idea maybe
i was hoping that by using sli on 2 7600/512 cards it would double the core & memory speed to 1600 . guess it don't work that way .
#1 problem . staying in a tight budget
guess that 1 ,8600gts would out do 2 7600gs 512's in sli . right ???
txs 4 reply

If you're planning to SLI two low-end cards, you're wasting you time, money, and nerves.

If you're going to SLI, make sure you get two top-end cards, and have a huge monitor with a very high resolution, of 1600x1200 or more (at least).

A general rule when buying a graphic card:

Buy the best single card you can afford. Simple as that.

I generally follow one simple rule:

never sli or crossfire a medium/lower end card. its just not worth the money being spent on two cards. Your better off paying that little bit extra and getting a single higher performing card which will outperform your lower end sli any day. single cards are also easier to power + have less issues as compared with sli and crossfire.

edit: lol 3 replies by the time i pressed submit...sheesh. oh and i stand corrected about the 7950 GT

txs everyone 4 the straight up advice . forget the sli 4 sure on my budget .
sending back the 7600gs (sucker worked great compared to my very old ti4800se ,lol ) . ordered the evga 7950 ko 512 . best i can do right now . but i know i will not be wondering bout sli and what if's ??? thanks all . i'll have the clock & mem speed now i really wanted with what i have 2 spent.