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Problem adding RAM memory to PC

I am trying to add RAM memory to a PC with a Gigabyte motherboard GA-7N400 Pro2. The computer has 4 memory slots. It originally had two memory SIMMs 256MB each. I tried adding another two SIMMS of 256MB, but they are not recognized (no error received) and the computer still only recognizes 512MB of total RAM. When I took out the original 500MB and put in the 2 new SIMMS, it recognized them and the system memory was 512MB. How do I make the system recognize 1GB of RAM memory? Here is a link to the motherboard: http://www.gigabyte.com.tw/Support/Motherboard/Manual_Model.aspx?ProductID=1678
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tmbarish
Asked:
tmbarish
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1 Solution
 
dKrishnasamyCommented:
What is the speed of the existing memory and new memory, it suppose to match and some times gives issue. If no sound received means may be problem with mother board also(memory slots in the bank B)
Regards
- Krishna
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tmbarishAuthor Commented:
See attached pictures of all four memory cards

simm1.jpg
simm2.JPG
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nappy_dCommented:
If you put your memory(old or new) into DDR  slots 2&4 is the memory recognized? I am thinking there is something wrong with the slots
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lenamtlCommented:
Hi,

It is happend once to me with a MSI mother board 4 slots  and was not working correctly when 2 memory cards where installed in the same time but both work ok if there are alone..
It was a known issue for this motherboard, so maybe you have similar issue.

Also it is better two have 2 memory stick from the same company and same model.

Check if the new memory will work alone and check if it is well seated.




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tmbarishAuthor Commented:
I put the two Apacer simms in the 2 & 4 slots
the other two simms were in the 1 & 3 slots.
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tmbarishAuthor Commented:
To lenamtl - I took out the original two simms and added the two Apacer simms and it recognized them and showed 512MB.
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nappy_dCommented:
Did you try with memory ONLY in slots 2&4?
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tmbarishAuthor Commented:
Yes, I just tried putting the two Apacers in 2&4 and it recognized them.
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tmbarishAuthor Commented:
But when I put all four simms in, it only shows 512MB
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lenamtlCommented:
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lenamtlCommented:
also found this in

their FAQ:

Based on nVIDIA chipset specification, the motherboard you have only support 3 DIMM slots officially. When a MB comes with GIGABYTE unique memory H/W deisgn, the board you have can provide the extra DIMM slot and make users get better flexibility on H/W installation/expansion. But, because the quality of memory modules in retail market is uneven, thus, when you install 4xDDR400 memory modules on the motherboard, our MB BIOS will decrease memory speed to make sure most system will bootup properly.
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tmbarishAuthor Commented:
Two questions based on the FAQ:
Does that mean that I can a third simm in slot 2 and it will recognize 3X256MB (slots 1,2,3)?
Would a BIOS update allow the use of 4 SIMMS?
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lenamtlCommented:
try to put 3 SIMMS to see the result first
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lenamtlCommented:
What I think is:

The motherboard has 4 memory slots but only six memory banks,
if you want to use four slots  then use single bank rank memory chips.
They should match: size, speed, timing and same manufacturer.
If using dual bank rank  memory only three slots can be used.
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tmbarishAuthor Commented:
I tried putting in 3 simms and it only recognized 256MB.
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lenamtlCommented:
The 2 APacer are compatibles and the 2 others models seems not if they are combine with the 2 Apacer.

I guess the only way to fix this is to buy another Apacer memory which have the exact same specs.

If you put only one memory not Apacer but one from the 2 other models is it working?


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tmbarishAuthor Commented:
I purchased 1 DDR400 simm of 1GB and the computer did not recognize it at all. It didn't beep at startup, but just didn't get to the bios check etc. Just remained a blank screen. I check to see if the memory was seated well and it still didn't work. I put the two original memory sticks back in and they were recognized.
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lenamtlCommented:
Are the new simm are Apacer brand?
How many beep?
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tmbarishAuthor Commented:
No beeps are heard. It just doesn't recognized the memory and the screen never gets to the BIOS screen. Memory type = Crucial DDR PC2700
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lenamtlCommented:
if using alone is it reconized it?
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tmbarishAuthor Commented:
No, the computer does not recognize the 1GB when used alone. It is DDR400 as required by Gigabyte's specs
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lenamtlCommented:
there is a compatibility tool on http://www.crucial.com

this is the models that is compatible:
http://www.crucial.com/store/listparts.aspx?model=GA-7N400%20Pro2

check if the one you bought is in the list
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tmbarishAuthor Commented:
Thank you very much. That tool on the Crucial.com website helped me realize that the memory I received is ECC, but the motherboard doesn't support ECC.
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