I bought an old computer from my mums work with a gig of ram i put another 512mb in and it is only showing up as 1gig i am befuzzled is there a bios setting or jumper setting somewhere because i dont have a manual
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Well, the maximum memory capacity is showing as 4GB with 512MB factory installed. So, what kind of memory are you installing? Are they PC2-6400 DDR2 SDRAM DIMMS? Are they EEC or NON-EEC? The same RAM card has to be installed in the paired slots, but they also have to be at a speed the motherboard can use (PC2-6400 for example).
Remove both sticks of RAM. Insert the "new" RAM where the "old" RAM was, and see if your computer reports "zero" RAM or 1GB of RAM. If the latter, put the "old" RAM into the "second" slot, and see if the detected RAM is the sum of the two sticks.
1st try to exchange the cards in the slot.
2nd try another card
3rd ur RAM slot may not be ok
4th ur RAMs may not be compatible
5th ur new RAM card may not be ok
use same type of RAMs, and same size...
if u have 256, add 256
if u ahve 128 add 128
if u have SDR then dont add DDR
getting compatibility is little difficult...
some times no combinations can work...
note...technology keeps changing...so a old RAM card that was bought years ago may not be compatible with a new RAM card....
even i got all my old RAM cards(256+128) removed and got 2 - 512mb of the same type fixed...even i had issues with my RAMs for 6 months...
Your mobo is quite old and its chipset can only support a maximum of 512MB PER SIDE (technically called a bank) of a memory module. I would guess that your 1gb memory module has 8 chips that are all located on one side of the module, putting all of the 1 GB on one bank. Thus, only 512MB of your 1 gb RAM is detected and usable by your motherboard (the remaining 32 mb is most likely being used by your onboard video). You'll need to find a double sided 1 gb memory module (usually 8 chips on each side).
This is likely a memory timing incompatibility. You can go into the BIOS settings of many motherboards and set the timing specifically for each RAM slot, but without knowing exactly which piece of RAM you have I can't tell you what to set it at. You could use the utility CPU Z, install one stick, run the utility and write down all the memory information, then install the other stick and write it down too. Then go into your BIOS and see if you can set all of your specifications to match the memory.
Of course if you could find someone to swap sticks with that would be easier. Some motherboards are more picky than others about which sticks they work well with, name brand manufacturers are more picky than aftermarket in general.