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http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Is there a "strap" setting anywhere in your BIOS?
I'm not at all familiar with AMD systems, so forgive me if I intrude here;
however, I would like to know the answer to your question.
I had a very similar problem with our i975X chipset and Corsair 2 x 2GB
DDR2-1066.
Reasoning from prior experience with older Intel chipsets,
the "strap" setting was meant to allow only certain combinations
of FSB and DRAM clocks.
As you may recall, a "synchronous" FSB :
DRAM ratio was not
strictly necessary on older Intel chipsets, e.g. the ones with
a discrete Northbridge / Memory
Controller Hub.
Nevertheless, when the ratio was something OTHER THAN 1 :
1,
certain motherboards would not support certain OTHER ratios
for various reasons e.g. DRAM clock was too high, etc.
But, things changed when memory controllers were
moved into the CPU chip itself.
One hypothesis then suggests that you may need to
increase other clock rates in your BIOS, in order to
maintain a balance with DRAM set to 1600 MHz.
And, that 1600 MHz speed is an option supported by
the XMP standard (see the photo you posted).
A call to AMD might answer your question more promptly also 
See also:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Memory Standard DDR3 2000(O.C.)/1866/1600/1333/1066
http://www.gigabyte.us/products/product-page.aspx?pid=3...
(Note 2) To support a DDR3 1866 MHz (and above) memory, you must install an AMD AM3+ CPU first.
p.s. I hope you don't mind if I just watch and listen now.
I will take a look at your User Manual and report back
if I find anything relevant there:
http://download.gigabyte.us/FileList/Manual/mb_manual_g...
MRFS