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ok let me stick my ram back in and lets see. Yeah totally weird, 1 stick in atm and not one error, freeze etc

(only just spotted that)Yep looks fine to me. Add another stick of ram in make sure it is set for 1 & 3 or 2 & 4 (not next to each other) and see how that runs.
that TDR regedit is one I've used before. Doesn't work in the majority of cases, and is dodgy according to most people.
http://forums.overclockers.co.uk/showthread.php?t=18393075
in fact it was you gregster who said it was a workaround an underlying problem(only just spotted that)
It is just a plaster but I wouldn't consider it a bad thing. I used it long enough and had no probs from it (I still had crashes though very occasionaly).How is 11-11-11-28 the same as 9-9-9-24 ?
It's ok set higher?
ive manually set timings to 9-9-9-24 to see any diff, also stuck 2 sticks in 1 / 3 at the moment.
So you think it's purely the GPU at fault ?