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I have an HP 705 g1 sff with an AMD A-10 7800b APU, and it was working in dual channel mode in DIMM slots 1&3 and the ram sticks that I was using are : Ramaxel 4gb 1333mhz Hynix 4gb 1333mhz 2 days ago I bought one extra 4 GB RAM stick that was a Samsung one and was 1600mhz (800mhz if working...