Info about wich RAM is better to buy

[[ITA]SEREUPIN80]

Hi,

i am going to upgrade my computer system, so i have a doubt on wich RAM to buy..


I like your products so I am going to buy something but, what is better for me ?


I found this product:

F3-2400C10D-8GTX


and this one
F3-2400C10D-8GTD


my motherboard is Gigabyte ga-x79-up4
cpu is i7-4820k


what is the differences between the two products? what are pros and what cons?
It can be a problem to buy 2x4gb of F3-2400C10D-8GTX and 2x4gb of F3-2400C10D-8GTD ? Or I can use them togheter without problem?! voltages and timings looks like the same...


Thank you for your help and advices.