New RAM, can't run at 1600mhz

I just ordered a second kit of Corsair Vengeance Pro 4x2GB RAM, my motherboard is a Gigabyte UD5 990FX Rev 3.0 and I can run at 1333mhz, but if I turn on XMP it will have a bios improperly configured / Can't boot message. Before I installed the RAM I could easily run with XMP @ 1600mhz.

Ps. I also installed a new SSD before the RAM today.

All help is appreciated.

"I just ordered a second kit" whats the other kit .. ram comes in kits because the ram sticks are sync/tested together  if you order 2 kits you can be in a world of hurt :( 

They are the same kits D=

I didn't know it'd be incompatable if they are the same.

i personaly dont realy know the gigabyte UEFI bios out of my head, But can´t you just set the defaul ram speed to 1600mhz in the oc tweaker? Also check the Dram timing table, maybe you have to set them by hand.

Also check your cpu Nbridge frequancy and HT linkspeed. This effects ram speed. Did you do any overclocking yet?