ASrock Z75 Pro3 - Strange Memory Problem

Slain wrote: Hi have you found a solution for this? I recently having the same Problem with my 4 x DDR3 1600mhz Ballistix Sport RAM where my bios is also detecting the same slots as yours on A2 and B2

Same board as the OP, Z75 Pro3? UEFI/BIOS version you are using? What processor are you using?

Windows version being used, and 32 or 64 bit?

No idea what size each DIMM is, 4GB, 8GB, or? A single kit of four DIMMs, or multiple kits?

The OP had two kits of the same model of memory, same timing and speed specs. The problem is memory manufactures that don't make their own memory chips like Patriot will change the chips used in a model, and mixing kits like that in the same channel or even the same PC may not work correctly. We never continued this thread, to suggest setting all the timings to Auto when using all four DIMMs.

Also if using two kits, put one kit in one channel, slots A1 and A2, the other kit is slots B1 and B2.

The OP had a strange situation, where he could only choose speeds of 1066 and 1333 in the UEFI/BIOS. The board supported higher memory speeds, but we never knew what CPU he was using. Some compatible processors only supported 1066 or 1333 speeds. He also may have had a UEFI corruption.

Partially detected memory is not uncommon with larger memory capacities. The UEFI will detect all the memory, but it is not detected fully by Windows. Increasing the DRAM voltage and other memory related voltages can help with that situation.