It is written on my graphics card ZOTAC GTX 570 1280MB 320BIT DDR5
Hi Schick, and welcome to the Z-Spot forums!
When registering, you must enter the model number. In your case, I believe it is "ZT-50201-10P", but check your retail box just to make sure. It should follow that exact format- beings with a "ZT" followed by some numbers. If you need some further assistance, please take a picture of the UPC label on the outside of the box and I'll be glad to help! :)