Which one of these should I buy?

Have a read here: http://www.tomshardware.com/reviews/graphics-card-radeon-hd-5870-geforce-gtx-480,2621.html

You're interested in the hierarchy on the last page.

Check the prices on ebuyer.com, ddr5 is better than ddr3 is better than ddr2. I'm running an ATI 5850 1 gig with TS2010. It seems to run quite well has directx 11 support which although isn't required by Trainz today would seem to be of importance for other software, and draws less power than the nVidia cards of the same processing power.

When comparing cards ASUS, MSI, Gainward etc all basically take the nVidia reference design and GPU and put their own name on it so I'd go with which ever is cheapest. There are some slight variations but not much.

Cheerio John
 
I have a 220 and am quite happy with it. (see below) If there is a power supply limitation, the 220 is your best choice. It probably has the most grafics power per watt. Some 220s don't even have a fan.
 
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