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I have an ASUS PR-DLS533 MB, capable of up to 12 GB. I had 2 x 512KB sticks originally. RAM reads 1 GB. PC2100, ECC Registered DDR.
I bought 3 more 1 GB sticks (Brand A) and a single 1 GB stick (Brand B)
I installed, in pairs, two of the A sticks. Ram now reads 3 GB.
I installed, in pairs but not matched, stick A and Stick B.
RAM now reads 2.5 GB!
I have swapped the 1's all around, and it is definitely stick B that is the problem. My question is why?
Any thoughts?:?:

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Last Post by jbennet
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Just check the following... you're trying to get 5 GB right, maybe the proble is that you have 4 1GB and 2 512, try the 4 GB alone, and see if that gives you 4 GB. It could be that you are interchanging with 1GB and 512.
Try that, I'm curious if that's it.
If not, I have a problem once where a slot was not working, I have 2 slots and I had 512 in each to make 1GB, but it only read the 512, it turned out it was a slot, but the machine still worked, kinda strange, but it happens.

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server boards are really picky about ram. it is best to keep all the same brand and size chips with in the board. i would never mix and match brands in there either.

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I have an old proliant server . It can get a max ram of 1 GB BUT WITH NO MORE THAN 512MB IN EACH SLOT- Check if yours is like this

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