What is the difference between these two RAM?

[cowdood]

They seem the same to me, although they are different in price. Would the cas latency difference cause this?

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231166

and

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231226

i suppose it is because of the timings, etc. Nevermind

 

[Atomic Rooster]

Yup, the first set has faster timings of 5-5-5-15 compared to 6-6-6-18 of the second set.