Well guys R290 delivered and at first thought it wasn't working and the instruction leaflet is not very good as it didn't work at first because it needed a 8pin and 6pin plug connected...also it doesn't say what socket to connect the monitor. Incidentally they assume you already have a 8 pin plug and give you an extra 6pin plug to connect to a couple of molex plugs.
The 7770 temporarily in no1 computer wasn't happy as I was getting some horizontal lines on the monitor, but back in no2 computer it's now happy with no problems.