I recently bought my new video card GTX 550 Ti 1 GB DDR5. Whenever I play GTA IV, Sleeping Dogs and even BattleField 3.. Every games sux on my new video card even though it is high enough to handle those game, but yoyo I can only run GTA San Andreas perfect xD.
I don't know whats the problem, before I had GT 220 1 GB DDR3 and it was running games perfectly but due to its low model, it can't handle infact. Then I bought new video card and still it sucks like my old GFX.
These are benchmarks comparing the GTX 470 to the GTX 550 Ti. It shows that Herr_Koos is indeed correct. The GTX 470 bests the 550 Ti in almost every scenario.
In all honesty, the GTX 550ti is a lower end mid range card. It's only suited to run games at 1600x1050 (at the very best), and you most likely won't be able to run them at max settings either if you want playable frame rates.
Furthermore, the GTX 550ti is leaps and bounds better than your old GT 220, I think you were just expecting to see MORE performance out of the card than it is capable of. Keep the resolutions at max 1600x1050, and keep the graphics options to a moderate setting, and you should be just fine. Also because of the limited amount of video memory, features such as AA will tax this card very heavily, so consider leaving those features out altogether on this board.
^ Very good summary. There is a reason the 550Ti is relatively cheap... I was considering it but then went for the Radeon HD6850 instead, because the 550 is a bit on the lightweight side for my taste. But it's not a bad choice if you're on a budget.
If your at 1080 bump the resolution down and you will find a lot of games are very playable just avoid aa and heavy af. Just a lower end card and it wont be able to run games but so well at higher resolutions.
To answer your question: Card is fine, power supply is fine for your setup.
Like I said, there is nothing wrong with the card. It is just not a performance card. It will be able to play some games, but not at high graphics settings, and certainly not at high resolutions. If you're okay with playing games at lower resolutions (720p, or 1600x1050) at lower graphics settings, then the card should serve you well enough.
Your power supply is not the problem at all with this setup. BUT if you're thinking of upgrading to a better card, you will need to get a better power supply. Most cards require at least a 550W power supply, so bear that in mind if you're planning on upgrading. (though I wouldn't advise it, since your CPU might bottleneck higher end cards.
Also, you need to check what your monitor is capable of putting out. Is 1360 x 768 the highest resolution it can handle?
High spec? He on first gen core series, and not a good one at that. I honestly think the problem is he has lower end/midrange parts and expects to much from them. i3 and 550TI isn't going to max out Metro at 1080. Dial the settings down and be happy.