Weird. That is exactly the same card as mine... I have less and less of an idea
when this thing happens. I will try building with various optimization fals but
it might be also that the card can get stick in a state where hiz not working
anymore but a real turnoff-turnon helped...

I am less and less sure what triggers the bad behaviour. Now it is good atmy
machine too. I will see if i can build with -O2 and fast math and still see it
working....