2133 vs 1866mhz RAM?

[sbl03]

What's the difference between the 2133mhz RAM and the 1866MHz RAM? I know that the 2133 is 1.6v at 9-11-9-28 while the 1866 is at 9-9-9-24 and 1.5v. Yet, the 2133Mhz RAM is cheaper by $10, which one should I buy? This is for an Asus P8P67 Pro mobo with i5-2500K

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231449
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231432

Thanks!

 

[Crashman]

What's the difference between the 2133mhz RAM and the 1866MHz RAM? I know that the 2133 is 1.6v at 9-11-9-28 while the 1866 is at 9-9-9-24 and 1.5v. Yet, the 2133Mhz RAM is cheaper by $10, which one should I buy? This is for an Asus P8P67 Pro mobo with i5-2500K

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231449
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231432

Thanks!

You could by the cheaper RAM and set it at 1866 9-9-9-24, or at least try