Memory failing even though underclocked

I've got an C2D E6400 2.13GHz running stable at 3.28GHz. 8 hours of ORTHOS without errors. 35 C idle and 60 C at full load.

But when I try the BLEND (stresses both CPU and RAM) test in ORTHOS it fail after 20 seconds. What can the cause of this be?

Running with stock settings the test passes.

Memory settings when CPU overclocked: running at 820MHz (410x2 with 1:1 FSB) with 5-5-5-15 and 2.1V (according to kingstons homepage they suggest 2.2-2.3V but my mobo wont allow more than 2.1V)

CPU: C2D E6400 2.13GHz @ 3.28 GHz
Motherboard: Asus P5B-E
PSU: Corsair TX650W
RAM: 1x2GB Kingston DDR2 1066MHz running at 820 (410x2 with 1:1 FSB)
GPU: HD 4890

Why is the test failing? Motherboard issue? I've tried all the dimm slots without any other results.
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  1. I suspect that you really do not have DDR2-1066 RAM. I suspect that what you do have is DDR2-800 RAM being pushed to the higher frequency by increasing vRAM and relaxing the timing. The 2.2 - 2.3 volt recommendation is a clue to this.

    Decrease your memory clock so that CPU-z indicates an FSB:RAM ratio of 2:1 (205X2) and see if blend fails.

    Another thing you can try is to relax the timing to 6-6-6-18 and run at 410X2.
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