Hihi all >_< sorry i am back with more questions

if you didn't already have a 670, then yes.
but in your case you already have a 670, so it will not be worth the money for the upgrade.
if you really are thinking about spending more money on graphics horsepower, then in your case i would go for an extra 670 in SLI sense you already have a 670. 2x 670 will blow away a single 770.
so rather have 2x 670 than a single 770 and a 670 just laying around. you might aswell use the card you have just bought.

---------- Post added at 10:55 AM ---------- Previous post was at 10:53 AM ----------

Sorry for asking a no brainer... What I meant was should I get sli or just one 780/770 which will be better ?

i hope the answer above explains it when taking the 770 into a count.
for the 780. well... again, it's gonna cost you, and it's not like you are gonna get your money back from the 670 you just bought.
 
the Antec 750 gold is perfectly capable of handling 2 GPU's.
it's a high quality 80+ gold certified 750W PSU. it will handle it just fine.
 
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