which 690?

Just get another 580. Your motherboard will support it fine, and at the price they are now - it'll give you similar performance to a 690, and will only cost you around £250
 
Or save the unnecessary expenditure and buy something else or keep it for the future. Think of it this way the money you save by not buying this card now could go into maybe even a top next generation card further down the line. As a few others have said the 580 is faaaar from outdated and will max out games for quite a while.
 
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