guys sorry to bother, i ned a little input here. i have checked this one on the litecoin harware mining comparison wiki page:
R9 290, GV-R929D5-4GD-B
and it says it runs at 817-830 khash/s
it's the current best gpu that has reached my country
do you think it is "the" card i need to mine nyans?
thanks!
Really depends on what price you get it for. The best option is to calculate total rig costs and balance it out so that the $/kh/s is lowest.
That being said. The R9 290 is a powerful gpu that has other functionality. Buying one of the top tier cards probably going to preserve your resale value a bit longer than one about to be cycled out.
There is no one "the" card. I use 7970s myself. It's really what you can get your hands on at a decent price

Good luck!