Question: Can ECC PC1066 RAMbus ram be mixed with Non-ECC PC1066 RAMbus RAM as long as they are kept in their respective pairs?

I have googled this question and apparently I'm not the only one with this question. According to http://www.rdram.us/ you can mix the two kinds of RAM together as long as the ECC and ECC are paired and the non-ECC and the non-ECC are paired. But, according to http://www.satech.com/motherboard-memory-asus-motherboard-memory-asus-p4t533-motherboard-memory.html (a retailer of memory), this is not true.

I have also searched this forum for this TOPIC and it came back empty.

I have seen mixed results all over google -- who do you believe? I do not know the ANSWER.

Any memory GURUs out there?

I know what I would like the answer to be -- at least then I could believe that it's not my motherboard causing the problem...

Thanks!Is that the difference in the pairs of RAM you mentioned in your previous post that you thought were identical? Although not a good idea in standard RAM, frequently it will work, but none will function as ECC. RAMBUS had such a short and limited lifespan, and it's own intricacies that I am not sure, if that is what we are talking about. I think this is TOTALLY dependant on the MOBO design, rather than a function of the RAM itself.Thank you for your reply.

While I thought the 4 modules were identical, I should have put on my glasses and took another peek. I couldn't see the difference between the 8 and 6 when it came to KVR1066X16-8/256 vs. the KVR1066X18-8/256.

When these are all installed in their respective pairs in my GA-8IHXP (2.x) mobo, I receive this error once Windows has started:

BSOD
Stop error: 0x0000007E (0x0000005, 0x8054B339, 0xF7C8164C, 0xF7C81348)
then it starts the Dumping Phyiscal Memory to disk...

When I take out one pair of the RAMBUS (whichever is in slot 2,3), the computer will boot FINE. So, my conclusion after all this is that either the ECC and Non-ECC RAM are not happy living together or there is something very wrong with two of my RAM slots on the motherboard.

What do you think? Am I close in reasoning?Yes. I think the ECC and non-ECC mix is the issue, rather than the motherboard.

Is this the answer you WANTED to hear? Haha. Yes, I suppose that IS the answer I wanted to hear -- because I don't wanna have to go and get a new mobo or a new computer yet...

I suppose though one more question answered would ease my troubled mind. Will the GA-IHXP mobo (or any other board) RECOGNIZE memory that is only installed in slot 2,3 and not in 1,2? It would make sense to me that a mobo would look for RAM in the first 2 slots -- 0,1 -- that those would HAVE to be filled with RAM before 2.3 could be used. Am I correct?

Now, if I am correct on the previous question, then the only thing left to do is chase down some more RAM that is either Non-ECC or ECC and make 2 matching sets for me to install -- and try.

Cross your fingers. Did you look here:

http://www.rambus.com/products/rdram/rdram_faq.aspx