Hi, I have an 8150 and an asus sabertooth 990fx motherboard along with 16 gig of xms2 corsair ram. I was sent a chart by corsair stating that amd fx processors will not support 1866mhz with more than 2 dims populated I was wondering if this is true? This is the chart  http://support.amd.com/us/kbarticles/Pages/ddr3memoryfrequencyguide.aspx

according to the chart any mobo with more than 2 dim slots can not run at 1866.  I hope someone can help clarify this for me.Thanks

I can see why that is not advertised. Im running all 4 at 1600 with no issues. i finally got it to boot and run at 1866 but had a browser  crash. I may be able to get it to work after messing with the timings but i dont think it will be worth it i would rather keep tighter timings.