gigabyte gpu

GIGABYTE INDIA - My Gigabyte Graphics card (GTX 660) has been lying with the service center for 3 weeks+ now. I called them up in the first week and they told me the card was repaired and I can collect it. I went to the service center (which is around 2 hours away from my place) only to find out...

Hi i have two concerns - 1. Can anyone confirm that how long does Gigabyte take to RMA it's graphics cards? Also, do they require an invoice for it or just the serial number will do? I have a Gigabyte GTX 660 which is showing artifacts in all games so I think it's gone bad now. Still has...