Rj's is right. Card shouldn't have a delta that big. Maybe try swapping the card from a slot to another and see what it does. Also for the driver issue, I didn't trally saw anything like that over time ( AMD or Nvidia ). Most of the time when driver fail it's due to a OS or to a hardware problem. Maybe test the card in single position and also test both the PCI-e slot.
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Martin_metal_88
Colenzo : See system spec!
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