Thanks guys for your valued comments- I use a better nvidea card on my UK machine (GE Force 7900 GS) and it runs faultlessly with no frame rate problems, so really can enjoy the latest mods to their very best.
The card causing problems is on another machine at my house in france, and since I must have the u boat fix when there too, I am going to upgrade it!
The machine has good processor and RAM but this card seems poor, and the above comments confirm what I thought.
The sub seems to jerk across the sea rather than move smoothly when using the ATI card machine.
Personally, I seem to favour n videa and have never has any problem with the black pyramid issue with these cards.
I will try to find out what slot and system the motherboard has, but am not really sure on this issue so may need to ask someone who does know.
Cheers!
