Arcording to those stats, GTX 680 outsells HD7970 9 to 1.
Back at the start of DX11 it was commonly used and considered a reliable source that represented a real average. The steam survey was presented as proof that fermi was a failure and AMDs 5000 series a smash hit. By it, people claimed AMD had 95% of the dx11 market and that nvidia wasnt selling many cards.
While i dont think its 100% accurate, those number do represent real gamers. I think that there was information that could be gather back then, during the 5000series, and today. It does say a lot. The 680 must be selling well and there must be more than 1000s units shipped worldwide. to be so high on the survey already, there has to have been a lot of them sold. Its not been out very long and nearly 9 times more steam players use a gtx680 over the 7970.
Steam is no small sample. Most PC gamers other than MMO dedicate have a steam account. You cannot even buy some of the most popular games now without playing through steam. as a matter of fact in 2010 valve had a whopping 30 million accounts.
http://www.rockpapershotgun.com/2010/10/18/thirty-million-steam-accounts/
with a year-over-year new user growth of 178%. But if we only use that 30million (which is absolutely surpassed by now), you can with simple math come up with a number of gtx680s that are out there.
steam users in 2010 X GTX680s share as of APR = number of gtx680s in the wild
30,000,000 x .0022 = 66,000
This number is not accurate, its severely under estimated. Using 2010 figures you could calculate 66000 gtx 680s that are gaming. there is absolutely no way charlie has any truth to his claims. Its a complete fabrication. The 66000 figure is lower than whats actually out there. Steam has more users now, and there are some ppl who dont use steam. One could argue that the mass of 7970 users dont use steam and therefor not counted. But you cannot posibly say that only 1000 gtx 680s were shipped world wide. Its just flat out proven wrong.
I would estimate that steam has at least doubled its user base in 2 yrs. If not they are close. We are looking at a lot more than 66,000, since the 680 launched just a month and a half ago.