Hi I upgraded from a Nividia 9800Gt to this and Im very happy with the performance boost, F1 2011 runs very smoothly on full settings even in Monaco which is a very intensive and detailed graphics track. It isn't the quietest card in the world once it gets munching pixels so don't put it into an entertainment setup for your telly but other than that its factory clocked, with a upgraded heat sink and you can probably clock it a little higher with EVGA software personally I haven't bothered but there is no reason not to. One reviewer says you need a 500 watt power unit, not so! its recommendation is a 400 watt, mine is a 450 watt in a shuttle and it has no problem whatsoever. The only NVidia alternative to this is the 560 which is 60-80 pounds more and does need a good 500 watt PSU, I would of considered that but then that would mean a PSU upgrade and it isn't worth it. I also play MW3 and it runs it fabulously and Medal of Honor Tier 1 really good frame rate at high resolution. If you want to SLI it, you can but make sure your board has PCI-e slots next to each other that each has double width space available as these cards each take up 2 bays each. Mine has a double PCI-e slot but single width so I cant SLI this or indeed most cards, plus 2 cards need more power from your PSU and an additional 6 pin power connector. At under under £100 this is a good buy and this card is faster than nearly all the other 550 cards.I Looked at the 2 gig version EVGA do, but that is clocked slower so opted for this as best value.