I fell sympathy for all ppl who get NMI Parity Errors becasue I have cried myself to sleep over this problem for like a month.
But w/ constant help from the wonderful guys/gals at NBF their experience helped greatly in rooting out some problems. I did research of Parity errors for a good solid 2 weeks. From reading 100's of posts and 'tech' guides I have come to find a few things.
Lots of people have different experiences w/ these errors and by reading their cause and effect stories I was able to play w/ many things.
From MY experiences I have come to see that-
It Could very well be a Hardware issue, but my natural human instinct points my attention to those Dell Drivers. I was running Dell stock driver 84.69 and had a whole slew of problems w/ my system while using it. When I came across a thread and there were people 'bashing' stock Dell drivers(note- im not bashing anything here, im trying to give an unbiased response). So i decided to uninstall 84.69 and a buddy of mine told me to use a 'genuine Nvidia driver, as they are the most stable.' He is a big computer dude and is pretty knowledgeable so I gave nvidia.com a look. I downloaded driver 84.63 and installed it(removed dell video stock driver 1st). I am now currently using 84.63 on my 1705 and I havent seen the error in over 4 months now. So it I now have a special place in my heart for driver 84.63
I should also mention. I did have my video card replaced but heres the rundown.
I used my 1705 and the 84.63 driver from Nvidia happily w/ no errors for about 2-3 weeks BEFORE i sent the laptop in to get its card replaced. However, I am convinced that it wasnt my card to blame, but the Dell driver. As I had stated above, I was was parity error free for about 2-3 weeks while using the nvidia driver.
The laptop was sent in later to have the LCD replaced(dead pixels) and they replaced the video card (fools)
So while only God may know what the problem was, Im convinced that it was a bad driver at fault, not necessarily my 7900GS mainly beacsue it ran w/ no problems for almost a month using a different video driver.
Hope this helps, GL man I hate parity erros w/ a passion.
Ps- FEED ME