new memory wont work

  chrisjohn 14:45 12 Sep 2009

have acer aspire 5720z laptop with 2gb memory,insalled 4 gb but it wont see it if i fit 3gb its ok ,dont know why it wont see 4gb,vista 32bt

  DieSse 15:01 12 Sep 2009

Because 32 OSs never see the whole of 4GB.

In a 32-bit Vista system there is only 4GB of available addresses. Quite a surprising part at the top of the address space is used up be various parts of the hardware. Also, I presume your laptop hasan integrated graphics controller, which alse "steals some RAM for it's own use.

Add these two effects together, and you lose up to about 1GB - varies from system to system and hardware configurartion to hardware configuration.

If you used 64-bit Vista, the address space limitation would be removed (if your hardware allowed it - but you would still lose some RAM to the graphics.

  Grey Goo 15:05 12 Sep 2009

something funny here
click here

  chrisjohn 15:05 12 Sep 2009

mant thanks so would the advice be stay 32bit or go 64

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