Ok, it would appear that my card has died 
I am currently running the system in sig.
I have looked at the x1950 pro but am unsure as to my systems capability to use the card to its potential or if it would be more cost efficient to purchase a lower spec card and save the money.
I am unable to afford an upgrade to PCI-e atm unless someone is able to find me a spec for about £200.
Which card would you suggest?

I am currently running the system in sig.
I have looked at the x1950 pro but am unsure as to my systems capability to use the card to its potential or if it would be more cost efficient to purchase a lower spec card and save the money.
I am unable to afford an upgrade to PCI-e atm unless someone is able to find me a spec for about £200.
Which card would you suggest?