Asus P8B75-M LE Does not run RAM @ XMP-1600


CPU: I7-3770K (Ivy Bridge, DDR3 1600 is officially supported)
MB: P8B75-M LE (that's B75): CPU and 1600Mhz DDR3 are supported also.
RAM: KX1600C8D3: Kingston HyperX 1600 with CAS Lat. 8. Has XMP with 1600. I found it in recommended memory list in motherboard manual.
Bios: Latest available (501)
CPU microcode: Latest available (checked with "intel bits")

By default BIOS reads 1333 settings from SPD and runs memory as 1333. That works fine.
When I enable XMP it reads all settings (and they are the same as I read in manual) and sets appropriate freq and clocks.
And board does not start.
"MemoryOK" led is flashing until I reset bios or click "memoryOk" button which resets RAM freq back to 1333.

I tried to:
1) Increase voltage: did not help
2) Set freq to 1400. It works. But I want 1600 !
3) Increase latency. Did not help.

Looks like one stick sometimes starts at 1600 while another never do it and both are unable to start too. But even when I run one stick at 1600 my PC becomes unstable (BSODs / "memory could not be written" and so on).

What am I doing wrong?
Should I contact Asus or Intel or Kingston? Should I change my memory or motherboard?

Thank you.
1 answer Last reply
More about asus p8b75 1600
  1. First, I am not aware of any CAS 8 DDR3-1600 Kingston HyperX kits, but most Kingston HyperX are 1.65v.

    So in addition to the XMP and make sure the DRAM Voltage is set in accordance to the 'XMP-1600' profile. IF the DRAM Voltage XMP voltage is 1.65v then that exceeds both the SB/IB spec which is possibly the problem.

    Q - What exact Kingston HyperX kit? ; please provide a link.

    CPU-z 'SPD' tab, note the voltage for your kit; CPU-z -

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