Ok so my SunRays are working but things did not seem as fast as I expected.
Then I realised that I was not using a SMP kernel. So Linux was only using 1 processor and 1gb of RAM. A very quick visit into aptitude a great way to install software, best character mode installer I have used) and it downloaded and installed a new SMP K7 kernel. Reboot and hey presto it is all very much faster (with 2 x 64bit processor and 4gb RAM it ought to be!)