Did you try memtest86 yet ? www.memtest.org has a little tool to make a usb key into a bootable memtest usb key. If rams don't give error on memtest then it can be cpu or cpu-nb having problems with 1800 speed.
I don't think having FX cpu unlocks more memory multi, 1600 and above is also O.C. for FX cpus. And it doesn't state memory limit on the Asus site. It actually stats some memory limits for certain cpu on some boards but not yours.
PS: Ah, i found something in the manual, *Due to different CPU margins, not all of AMD CPU can support up to DDR3 1600 and higher frequency DIMMs.
I don't think having FX cpu unlocks more memory multi, 1600 and above is also O.C. for FX cpus. And it doesn't state memory limit on the Asus site. It actually stats some memory limits for certain cpu on some boards but not yours.
PS: Ah, i found something in the manual, *Due to different CPU margins, not all of AMD CPU can support up to DDR3 1600 and higher frequency DIMMs.
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