hhudsonn :
I purchased two kits from tigerdirect.com each kit consists of 3x2gb sticks.
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4282847&CatId=4093
I have installed one set in the blue dimms, and one set in the white dimms.
I have swapped the sets between the colored dimms.
I have taken the memory in and out man of times, each time they go in differently, and always show 8 gb.
I see no settings in the bios about controlling the memory or adjusting it.
Looks like you got a really good deal on the memory, I got the same stuff, but instead purchased the 12GB set in which all six sticks are Matched.
Buying two separate sets does Not guarantee that the memory will be Matched.
Try checking the memory as follows
- Remove three sticks of the memory, leaving memory in the white slots
(Lay the memory out in such a way that you know which stick is which so as not to mix them up)
- Boot the system up
- watch to see what the screen says of the memory and see what the BIOS says
- shut the system down
- pull the memory and insert the other three sticks (same thing again - do not mix the sticks up)
- repeat the above process
Hopefully both sets will run in Tri-Channel Mode
Hard to say, but from your description it sounds like two of the memory sticks may
be defective or there may be a problem with the motherboard.
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This process is a bit clumsy and tedious as you're gonna have to rely on the process of elimination.
At the same time, you'll need to be Careful of Static and not to Damage the motherboard as there is some RISK with this method.
If two of the sticks are bad, the problem here will be locating which ones are defective.
- Now if both sets show as Dual-channel mode, then without mixing the memory up, swap one stick from the sets
- reboot noting any differences.
If you see it display as Tri-Channel, then you will know that you have swapped out one of the defective sticks.
(providing it's the memory and not the motherboard that's defective)
- shutdown
- swap out another stick
- Repeat process
I hope you get the general idea of the procedure I'm outlining.
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You may have to repeat this process for each of the individual memory slots using only the white slots.
This would be alot simpler if the system used Dual-Channel memory, but the problem here
is you need three sticks in the system for it to even work where as with dual-channel, you
would only need two sticks to run the system.
This would be a lot simpler if you had access to a memory testing device instead of using the system to do this.
Well, hopefully you'll be able to isolate the defective memory sticks (If it's the memory)
-
You might be better off having (I hate to say this - Ugh!) the Geek Squad (Double Ugh!) check the memory out.
Or better yet, some other computer shop which may have a memory tester on hand.
As I've stated before, this would be a lot easier if Gateway (Acer) would provide us with the service manual for the motherboard.
Good Luck