Originally Posted by taunk
is there a way to utilize it i've gigabyte GA-H57 board .
It's kind of silly to ask that question when you have the memory and the motherboard sitting there right in front of you. Plug it all in and see if it works. Just plug matching sticks into the slots that are on the same bus.
For example if you have slots A1 A2 and B1 B2 plug matching sticks into the A slots and the other sticks into the B slots. If you have trouble reverse the sticks in the slots, ie. A ---> B and B ---> A. If it still doesn't work post what happens and we'll see if we can help.
Mixing memory is always a crap shoot, sometimes it works, sometimes you have to set the speeds and timings manually to get it to work, and sometimes it doesn't work no matter what.
I'd also download SiperPi and run some baseline tests at 1K so you'll be able to tell if and what the benefits are if you can get all the sticks running together.