Hi again.

Firstly thank you to everyone for helping me get off the ground with my rig.

I now have 4 cards:

2 x 570 4gb and 2 x 550 4gb.

Running the 2 x 570s I get around 20(ish) on each card. So I sold a few things and got a 550 4gb - plugged that in on a riser and restarted Claymore..Found 3 x gpus..Great.

The 2 x 570's now run at a reduced 15mhs and the single 550 4gb runs at 8mhs. Which is not as good as the 2 x 570's..

Stranger still is if I add another 550 4gb it will only ever see 3 cards ? I have interchanged the risers and cables and they all check out.

Has anyone got any ideas about the reduced speed and 4 th card ?

Many thanks for any help.

Ken

Forgot to say Windows 10 - 64bit Gigabyte z170 board