If you want to now how many you can use Google Adsense Maximum Ad Units Per Page then the simple answer is You can allow Maximum of three AdSense for content units as you like from text, image or rich media in one webpage. 3 AdSense for content units Maximum 3 AdSense link units 2 search box in one page Total 8 ad unit in one page we suggest use Google recommended ads because you can earn 30% extra from these ads.
I don't think it's a new rule. I would have read about it. Although in some sites with high traffic, the publishers have special rules which are not the same as standard publishers. So in those special cases, yes none of "our" rules apply.
Its no new rules these site have premium membership of adsense How you can Premium member of adsense ? Your site Have more than 5 millions search queries per month You are must using top level domains like .com , .org etc Your site is getting maximum visitors means huge traffic on daily basis Fresh and unique content on your site is present (main condition) Million visitors in month is must. Thanks
If you have 1 Million visitors per month then you can apply for Premium membership Via Contact Google.
Any site with 8 ad units on one page instantly gets closed in my browser. No way I'm going to wade through all that crap to find content. Personally, I would never put more than 2 units on any page, though I realise we're talking technical upper limits, here.
The reason why you would see sites with up to 4 ad tags is because that site is most likely running through a network partner for Google AdX. Google AdX allows up to 4 ads per page. At PremiumCPM we are a tier 1 Google AdX Partner and see RPM's at $5.00+