defects

I am buying a Gt 710 2Gb gigabyte (used for 6 months) The seller is surely genuine,and he has agreed to come over to test the GPU on my Pc. I wanted to know that if i can check the Gpu for every possible defect within a time limit of 1 hour... Can you guys suggest a software or something for...

My current system specs are Processor: Intel Core i3 540 @ 3.06 Ghz Moboard: Gigabyte H55M-S2 Hard Disk: Western Digital 500 GB Physical Memory: 2GB DDR3-SDRAM (will b upgrading to 6GB) Power supply: Cooler Master Extreme Power Plus 460W...