Thanks all, that's all really helpfull
MS Flight simulator is one of the games I'm struggling with, but there are a few others that seem to start to labour at 1440p with high settings on.
Will check out that CPU-Z app to see if my Processor is my weak point.
Will also absolutly test the Temperature as well as am convinced it is running hot most of the time (my office is always about 5-10 degrees warmer than the rest of the house and think the PC must be the culprit!)
Might stick with 16GB for the moment to keep the costs down.
Thanks all, owe you all a pint.