Windows 7: New Mobo only allowing half of my Ram?

Good morning everyone, recently i bought a new mobo and CPU. now that everything is installed its telling me i have 16GB of ram installed, but only 8GB are usable....





here is my new processor, which i dont think applies to this issue

AMD FX-8350 Vishera 4.0GHz (4.2GHz Turbo) Socket AM3+ 125W Eight-Core Desktop Processor


here is the new mobo..

ASUS SABERTOOTH 990FX R2.0 AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard with UEFI BIOS

here's the kicker, the mobo and processor came as a deal with 8 GB of ram.. here's the ram that came with it....

G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory

its the same type of ram i have now.. i'm noticing that on the mobo, unlike my old mobo, the slots are different ----alternating---- colors.. where my old board the colors were paired together.... should i be placing the ram in a certain way?

sorry everyone i just figured it out. it was what i thought, they were on different channels i guess. i took the ram out and put the two new sticks in corresponding colors as well as the old. and now its recognizing all 16GB.

hope this helps others.