Please help I can't get 1600 in a Biostar TA75M+

[roundpoint]

Biostar TA75M+, AMD Llano 3850, 2 matched pairs of RIPJAWS DDR3-1600 PC3-12800 4096MBx2 CL9-9-9-24 1.5v model #F3-12800CL9D-8GBXL. I can't get 1600 if I put the four sticks in A1 B1 and A2 B2 I only get the memory to runn at 1333 for a total of 16 Gb. But if I install only A1-B1 for a total of 8GB Mother board runns at 1600 with out touching any settings in Bios and runn by SPD. I tried to force true Bios setting at 1600, still only does 1333 and get 1600 with out touching any setting if I only put 2 sticks in A!-B1. By the way Im running Windows 7 64 bit. Please help, any body have any ideas what to do?

[Tradesman]

Which version of Win7 64...if it's Premium, it only supports 16GB

[roundpoint]

Windows Pro 64

Is windows 7 Profesional 64 bits. Im not have a problem with the motherboard recognising the amount of memory the problem is the speed. Each Dimm supports 512 Mg/1Gb/2Gb/4Gb/8Gb DDR3 800/1066/1333/1600/1866.Total of DDR3 Dimm slots x4. What I tried to do is to put a 1600 4Gb stick in each Dimm for a total of 16 Gb of ram, but I can only get 1600 when I install only two sticks in A1-B1for a total of 8Gb, but if I intall the other two for a total of four sticks of 4 Gb my speed drops to 1333, even if a forced true Bios to work at 1600. Help please!!!

[Altered]

You might check The Rebels Haven for info on this. They are diehard Biostar guys. If there is a issue like that related to the board they would probably know or even possibly have a BIOS to fix it.

[GSKILL TECH]

You need to increase the CPU-NB Voltage to stabilize full slots.

Thank you
GSKILL TECH