The VRAM is dying..... typical of nV cards...
not only does the OP in NO way indicate a memory error - there are no artifacts, bad polygons etc..etc...i have NO idea how you could conclude that a micro-stutter like that has anything to do with faulty vram. (As a side note, i also never heard of any "typical vram dying with NV cards" issues)
Also..i had this issue once...it might be driver related, with some older driver. Also noticed that it MIGHT happen after many hours WoW playing in certain battlegrounds, restarting WoW fixed the problem. MIGHT also be related to SSD....so its unclear what caused the micro stutters.
Now explain to me how a stutter every second or two makes you conclude it is VRAM? The wirst thing which can happen is he is going through the RMA process - they find nothing and he will STILL have the problem.
To exclude Vram etc,. problems i'd say he should run the OCCT3.1 GPU tests as well as furmark...and also a variety of 3dmarks and look for artifacts. But i am pretty sure its not a hardware defect.
Edit: Oversaw that you did get an artifcact..so yes..RMA no question