You'll probably be ok for SC2 and most RTS games, but not FPS titles. The Radeon 5450 is a simply a replacement for the 4350, it's not a gaming card. In the graphics card arena, it's not simply "higher number is better".
While series 5 Radeon cards are generally better than series 4 which are generally better than series 3... every series has cards from budget models to high-speed gaming models. A card's positioning within the series is more important than what the first digit is. A 2006 Ford Mustang still easily smokes a 2010 Ford Fiesta, despite the Fiesta being newer.
http://www.techspot.com/review/244-ati-r... The Radeon HD 5450 has weaker gaming performance than even a 4-year old 256mb Radeon 2600XT. But since RTS games typically don't require much graphics horsepower and Blizzard has stated they're planning to make SC2 compatible with a wide range of hardware, it's should be enough. Still, you'd be better off finding a cheaper computer with just integrated graphics then adding something like a Radeon 4650 or GT 220 for $50.
Those are the cheapest cards which have decent overall gaming performance, enough to play titles like Half-Life 2, Call of Duty and Oblivion. If you're only playing strategy games and no shooters or demanding MMORPGs, the HD 5450 is probably enough. By the way... if your current computer has at least a dual-core processor then you might just need a graphics card (and possibly power supply) upgrade, not a whole new system.
Anyway, here are some low-cost options: http://www.newegg.com/Product/Product.as... http://www.newegg.com/Product/Product.as... http://www.newegg.com/Product/Product.aspx?Item=N82E16883227221 Or you could buy something like this: http://www.bestbuy.com/site/Asus+-+Essentio+Desktop+with+Intel%26%23174%3B+Pentium%26%23174%3B+Processor/9699016.p?id=1218152460479&skuId=9699016&st=essentio&cp=1&lp=1.
Pretty much anything in the RadeonHD 4000 series and the 5000 series can handle just about any game out there....for now at least.
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