Is it possible you have a 32-bit rather than 64-bit installation?  The
4G limit would be an unsurprising system (2**32 == 4G)

 -T

On Fri, Mar 18, 2011 at 12:27 PM, Paul Stenquist
<[email protected]> wrote:
> I upgraded the memory on my iMac 27 to 12 gigs. I did it mainly to get more 
> memory for PhotoShop for things like noise reduction, which can be poky, due 
> (I think) to scratch disk involvement. The computer reports 12 meg of memory 
> and says its okay, but PhotoShop still sees only 4 megs -- what I had before. 
> Do I have to reinstall PhotoShop to get it to see the new memory? I've tried 
> restarting both computer and PhotoShop to no avail.
>
> Paul
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