So you ran a game at 1440p in to the 1080p monitor fine? Suggests that the GPU is handling 1440p doesn't it? In any case, RMAing the GPU is probably a safe bet here.
:edit: to clarify, when I said downscaling before I meant downsampling!
Sorry a bit confused. How can I set a 1080p monitor to run at 1440p downsampling?
I ran my 1440p at 1080p, working fine. Regardless, courier coming to collect tomorrow.