I dont know if you noticed but the RAM timings are in different order on P5W-DH.
That is why many people have to use "by SPD", the memory won't boot with incorrect timings.
I passed through this myself, finally noticed the timings order and switched RAS precharge & RAS to CAS delay, no more instability, all workin like a charm.
Check on your systems, it is possible that they are switched and if they are - try configuring them manually instead of using "by SPD".
Before figuring this out - I also had "by SPD", and it was UGLY - the motherboard set them to 5-6-6-18 or something...
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