Should you replace 300*250 Google Adsense Ad Unit with 300*600 Half Page Ad?

Google Adsense recently introduced 300*600 Large Rectangle(Which is often called as a Half Page Ad).Previously this ad unit was available for only Premium Adsense Publishers but now Google Adsense went ahead and made it open for all.So,now all the Adsense Publishers can use 300*600 ad unit on their blogs and websites.

• How to get Google Adsense Approval Fast?.

Advantages of 300*600 Half Page Ad Unit:

Adsense Ads are always bigger the better.Surveys say that larger ad units perform well than smaller ad units.300*600 Ad unit made available for all because of following reasons;

• To increase CTR(Click Through Rate).Large banner ads can generate more clicks.
• More Clicks = More Earning.
• Generally Larger Banner Ads lead to higher CPM(Cost Per Mile or Thousand Impressions) and CPC(Cost Per Click).

Review of 300*600 Ad Unit:

I always keep on testing the performance of Ad Units at various placement by conducting split testing.Similarly I experimented 300*600 Large Rectangle by replacing it with 300*250 Right Side Ad on my blog.The results were as follows.

After replacing 300*250 rectangle with 300*600 the results were as follows.The below screen shot shows the performance of 300*600 Half Page Ad.

300*600 Ad Unit Performance Report

The Ad Unit has generated income of $7 thorough 32,111 views with a CPC of $0.11.

Similarly you can check out the Ad Performance of 300*250 Ad Unit from below screenshot.

300*250 Ad Unit Performance

This Ad unit has generated over $12.43 through 23,891 views with a CPC of $0.25.

300*250 VS 300*600: 

From the above reports its clear that 300*250 Ad Unit has out performed 300*600 Ad unit.In terms of CPC also Medium Rectangle has performed well compared to Half Page Ad.

Why 300*600 Ad Unit didn't perform well?

There are many reasons which I 

analysed after testing both Ad Units.

• 300*600 Ad units are new and many of the advertisers not yet started using these ad units.
• Shows up only few image ads.Generally image ads cpc will be higher compared with Text Link ads.So, lesser images ads means lesser cpc generated.
• The worst thing is that most of the time these ads remain 50% blank and sometimes even 75% blank without any ads.The text ads shows also are ads with very less cpc.Which doesn't generate much income to you.

Conclusion:

Currently I suggest you to stick with 300*250 Medium Rectangle.After few days more and more advertisers will be turning towards Half Page Ads,then you can start using 300*600 ads which can generate more income in future.Let me know your opinion in your comments below.