This Radeon 6670 card is in the low to mid range of graphics cards at the moment, it's not the slowest but it's certainly not the fastest and there are cards out there that for a little more money say £30 can do a lot more. My main comment is that you should not expect this card to increase the speed of an already newish PC! The card would bottleneck anything below a 3ghz i3 upwards, if you're gifted with kit like that then treat yourself to something a little faster and get a bit of future proofing built in.
Alternatively if you're in the market for a cheap and cheerful gaming card, then provided you are willing to play in lower resolutions 720dpi say on low to medium settings, then for most games (provided the rest of your PC is up to spec for the title) it's going to allow you to play quite happily.
I play battlefield 3 on 720dpi with low and medium settings, 3ghz core 2 duo and its silky smooth. Okay, its not the gaming PC from tomorrow but I just want to play!
The card itself is a nice package, multiple connections and support for two outputs (i know it shows VGA, HDMI and DVI but the card only supports 2 outputs) low noise temperature sensitive fan with a nice bit of memory running average frequency - sums up (given the price point) to be good value for money. Watch out for the 2gb versions, they do exist!
Another good thing about this card is that its running at about 65watts, so if your power unit is not a beast of a power unit you can throw this card into your systems without too much worry about peaking your power drain. Good for some bare-bones or manufacturer specific cases where the switching power unit is not an option.
Would I buy it again? For the price that it is...yes, its pitched very carefully at those people who don't want to upgrade but who do want to play games and do so with a moderate amount of enjoyment for the minimum amount of money, go any lower in spec and your going to find it hard. If I did have that bit more cash I would chip it in and buy something in the £80 range!
SOMETHING YOU MIGHT NOT KNOW....the 6670 card in some instances (you would need to do your research as I am sure not all 6670s do this) partners with the new AMD trinity CPU/APU by using AMD CROSSFIRE software, this basically allows the discreet graphics card to compliment the new line of CPU's with integrated GPU cores, meaning if you did buy this and thought later that an upgrade was in order, or visa versa bought an trinity CPU and wanted a little more power, then AMD have made it so that in some cases the 6670 can parter and beef up the total graphics power of a system. Image my surprise when I figured I could do a sub £100 chip upgrade and then benefit from a combined graphics setup with the power of two cards. Neat!