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Is there any other choice than a 6950 for £199?
Get it, unlock the shaders and overclock it to 6970 speeds.
They are not silent though but they are quieter than the 4xxx series so it should be an improvement from your 4890.
The 560 has got a smaller buffer (which is starting to be a problem in some games at your res), slower memory and it is slower at stock. It is a quieter card than the 6950 though (these are not loud either though!) but that is about the only advantage it has got.
Their Crossfire performance is also amazing and scale better than the 560 series.
Where has this buffer size issue come from. Has there been some new games recently that are pushing cards more?
OP, for that cash the obvious choice is the 6950 and then unlock it.
Another one for 6950, unlock shaders and overclock.
Theres an MSI twin frozr 6950, can it be unlocked?
So whats good about the Twin Frozr, its kind of pointless and not going to sell very well