Another update.

Had another chance to look at this and as a last resort moved the x1900xtx to the x8 PCIe slot and guess what it works!

When I got the machine I thought it was weird that the GeForce was in the x8 slot but I still managed to use the x16 slot with the x1300pro. So not sure if the x16 slot is potentially damaged.

I’ve now got the x1900xtx in slot 3 (x8 speed) and my network card in slot 2 (x4 speed).

Haven’t had a chance to play around with it yet but from two minute test the issues I was having with tinygl have been removed.

I’ll have more of a play around over the weekend now and see how I get on.