Will they work together? Here is the ram: KHX1600C9D3/2G and here is the motherboard: Biostar A785G3 It's not listed on the supported memory but I don't think that list is complete. From what I can tell it should work.
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I see no reason why it won't when the KINGSTON's KHX16000D3T1K3/6GX 2G DDR3 2000 are supported. You will most likely have to manually set the timings, voltage and Mhz in the BIOS