Dual Channel and Single Channel Ram not compatable?

williamemoon

Honorable
Dec 29, 2013
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10,510
I bought a kit that contained

BIOSTAR Hi-Fi A85W FM2 AMD A85X (Hudson D4) HDMI SATA 6Gb/s USB 3.0 ATX AMD Motherboard

two sticks of

G.SKILL Sniper 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBSR

and one stick of

G.SKILL Value Series 8GB 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Desktop Memory Model F3-10600CL9S-8GBNT

The system ran for over a year with no problems but after blowing out the dust last week I got a bios memory error (multiple short beeps). All 3 sticks of ram run well alone or in a pair, but when I attempt to run all three I get the error. I tried all twelve different permutations for ram placement with all three sticks and still got the bios error. I went through the board's manual and found instructions on dual channel memory installation, but the two G.Skill ram run in slot A1 and A2, but not in A1 and B1 which is what the manual says to use dual channel.

I would like to have all sticks running if possible but can not figure out how to make this happen.

Thanks in advance for any help.