I've owned NVDA since June of '99. At its peak I was sitting on a 1500% gain (now it's a mere ~220%). The current downtrend is a factor of several reasons noted above.
Analysts are now being more cautious in the comments as a result of the various scandals, so I think the recent downgrades are a bit more cautionary than in the past. NVDA has always met it's numbers and as of yet the company has not revised its own guidance.
ATI has gained back some market share recently.
Less than expected sales of the Xbox is a factor, plus the pending arbitration with Microsoft over the pricing of the Xbox chips.
The SEC investigation is finished, and actually the restated earnings were increased by a million or so dollars over the two year period. The amounts in question were relatively minor, not nearly of the magnitude of some of the other scandals.
It's not that NVDA can't get a P4 bus liscence, it's just that Intel wants too big a fee (to NVDA, anyway
) for it, something on the order of $5 per chipset I believe.
And of course, NVDA withstood most of the big declines of 2000/2001 with little effect, up until the last few months. I guess you could say they were due, that kind of performance can't be maintained forever. As someone above mentioned, this market is dragging the good companies down along with the bad, and that's my opinion as to what's happening with NVDA. I have held through it all, and will continue to hold.