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I have a server that came with two sticks of 2GB PC2-6400 ECC ram (Hyundai). We also bought two sticks of Corsair CM2x2048-6400C5C (PC2-6400). So I installed all 4 sticks and the machine started beeping and wouldn't boot. So I took out the factory RAM and tried just the Corsair RAM and it booted fine. Took that out and tried the factory RAM and it booted fine.
So I was super confused and then read about mixing ECC sticks from this post. I then thought I'd consult the technical manual of the system board. The odd thing is that it states it requires unbuffered RAM
to work. There's no real indication to me that the modules can't be mixed.
Could someone try to explain what the problem could be?
Are you sure they are both unbuffered or are they both registered? – xxl3ww – 2010-09-02T13:22:59.543
It's not clear from your post, so please note that ECC and buffered / registered RAM are not the same thing. A stick can be none, one or both of them.
– DMA57361 – 2010-09-02T13:25:29.16799% sure it is unbuffered. Registered memory is keyed differently. – hanleyp – 2010-09-14T16:08:13.187