Yes, nvidia do have problems with their cards and I was informing the OP of this as it is possible the 2nd card could also be faulty.
I still fail to see the problem?
I see what your doing here, I am being trolled!
My Sources? Well I manage a computer and laptop repair shop, I would like to think its the biggest in the country and we do work for companies all over the UK. I have repaired dozens of nvidia desktop cards recently and not had to repair even one ati card. Laptops I have repaired hundreds of laptops with failed nvidia graphics chip with only having to repair a handful of ati chips.
I thought it was pretty well known that nvidia graphics cards were unreliable, although only partially their fault, the real problem is with the ROHS compliancy and the introduction of lead free solder, which is of course prone to failure due to how its made.