I have GTX 750TI, I'm thinking of getting 2 GTX 570 SLI style, I checked both of them, they have similar technology, and he 570 supports DX12 and have higher memory width and bandwith.
Your PSU can't handle 2x570. Just one requires around 550W, for 2 you need 800W and 4x6pin. Your PSU cant feed that. That means you need to spend at least 80$ for a decent PSU which can handle them. That makes it $300. For that much you can get a GTX 970 which will destroy 2x570.
A single 570 slightly outperforms the 750ti so 2 will win hands down. Thing is, is it really worth it? Can your PSU handle it? How much are you paying for them? If you are paying a lot, then a single newer GPU would be better.
Can't find benchmarks comparing them. My concern is the driver support for the 570's especially sli. The 570 will be 5 generations old in the summer, I really can't see driver support for new games being very good, sli drivers being even rarer. Even the 750Ti is getting a little old compared to a 950 which will probably be replaced this summer. Investing in such old gpu's does seem worth it
A single 570 slightly outperforms the 750ti so 2 will win hands down. Thing is, is it really worth it? Can your PSU handle it? How much are you paying for them? If you are paying a lot, then a single newer GPU would be better.
it will cost me around 110USD each. my PSU is 500Watt only
Your PSU can't handle 2x570. Just one requires around 550W, for 2 you need 800W and 4x6pin. Your PSU cant feed that. That means you need to spend at least 80$ for a decent PSU which can handle them. That makes it $300. For that much you can get a GTX 970 which will destroy 2x570.
An overclocked 750ti performs closely to a single gtx 570, your psu might support 1 gtx 570 if it is of decent quality. As sli
isnt an option for you please choose a single 570 over the 750ti if it has more video memory, it likely will not.
a good rule of thumb is to get the single best gpu that you can afford. sli can sometimes create problems with some games that single gpu's do not have.