And please keep in mind that Yoshi P is planning to scale up the quality of the graphics in the game over time based on a few of his interviews (Hmmmm PS Foooour....?) So plan your PC choices accordingly. o.o/
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A 5770 is about the same performance as my 260gtx. I'm getting 3k with nearly max settings at 1080p, 5k on max settings at 720p, so it could work for the op. I do agree with Abriael that the card is way past it's prime. Even if the current system could bottleneck a newer GPU, if you plan to further upgrade your PC in the next years, getting a stronger GPU now is not a mistake. The difference between two generations of a same-class GPU is not big. For example, a 460gtx performs nearly the same on the benchmark as my 260gtx
The OP specifically said he/she was looking for a "cheap" GPU to run the game decently and if possible he/she would rather not upgrade the PSU. Hence the 6670, both 660 and 5770 require a new PSU. If the OP does decide to change PSU, then there are still better bang for buck options, assuming the OP still wants a cheap solution. Considering the OPs specs and the fact he/she runs at 1024 x 768, a 660 for $210+ is really not the best option.
If OP wants to future proof and is willing to spend extra, then i too would personally be recommending different stuff but to assume were being nearsighted simply because we were trying to meet OPs requirements only shows your own lack of comprehension on the issue.
They're both very good cards. Get the normal if you want to save some money, or the TI if you want to go the extra mile for a bit more juice. Remember that the Ti requires two power connectors instead of one, but that shouldn't be a problem.
Mind you, with a good processor (AMD 965 black edition for instance) and 4 gigs of ram even just the 660 holds the benchmark at over 6000 at maximum settings, so it's just a matter of how much you wanna spend and how futureproof you wanna be.
Ultimately the TI is the best card between the two, but the normal is probably slightly better bang-for-buck.
remember 1.0 taking down all grafics runs perfect on my old 9800gtx lol now i have serie 2 SLI 295gtx at 896bits and when i think back on the pass i was using a 128bits card and game run on 1g memory shared on the sistem and now i have 2g memory core and share 4g video memory dedicated runing a core 2 quad 9550 and on 1.0 i was using a dual core on less then 5.4hrz lol also now im using 8gmemory dd3 and back then i was using only 2g memory dd2
soo realy the game specs was not soo high back then on 1.0
and now my score on maximum on the benchamark only give a farly high sooo i ausume the benchmark dont read my SLI sistem