I'm so glad I saw your sig. I was about to mention you can't upgrade the GPU ram like that. The 6850 I know is a video card from ATI/AMD and might have been sold by Asus. Then I saw your sig. Whew.
You have an Asus CM6850-01 motherboard. How do you know the original sticks are failing? You could buy a new 2x8GB DDR3 set if you wanted to. I advise not however as that's money spent that won't carry over to a new build. Buy the ram if it's cheap and will get you going again. But if you can't find it cheap then I'd look into buying a new setup that supports DDR4.