MacPro sees 16g mem but Activity Monitor Only Shows 8 Gig

I have 4 simms of 4GB mem in my 2008 MacPro. I always thought all was ok as "About this Mac" shows 16GB of mem. But when I run Activity Monitor, the System Memory pie chart says I have 8GB. Is there another way to confirm how much mem is being recognized by my MacPro?
I only discovered this when running "icleanmemory" from the app store, and noticing I only ever have approximately 3GB free at any one time. Looks like my Mac is not seeing at least 8Gig of mem EVEN THOUGH "About this Mac" clearly shows 16GB.

And not just a reboot, but boot in Safe Mode.
Sometimes a clean install or reinstall over what you have, because a few people (a fraction of a fraction) had a system problem
Some background tasks dont' uninstall, not easily.
They get added to launch services and have to be removed through launchd
Heat is always an issue with RAM
Not showing up all the time with what it should be.... call it defective, call it marginal, have the vendor exchange and let them use more robust testng
FBDIMMs get subjected to heat, and heat-cool cycle stresses electronics
Keeping them below 72*C is important - I use Smcfancontrol 2.x
Riser releated issues
All 4 on one Riser?
Ideal is one set on each Riser
Swap al the Ram to first one andthen the other (the top Riser has to be populated and can't be left empty
Try with one pair, then the other and insure you get 8GB eachtime.
Narrowing it down to a pair, to Riser, to placement.
A common thread, DIMMs show but half capacity. Defective, gone bad.

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WZZZ wrote:
I have a related question about the pie chart.
I have 12GB installed. Free at 9.72 + Used at 2.28 adds up to 12GB.
But adding up Wired at 957.4MB, Active at 754.1MB, and Inactive at 632.4MB comes to 2.3GB (rounded). Adding that to the pie chart figure of 11.75 gives a total of 14.05GB, which isn't possible. What does the pie chart figure at 11.75GB represent? It can't be the 12GB minus the Wired, Active and Inactive either, since that would be much less than 11.75. And if it's supposed to be the total of installed Memory, why the missing .25GB?
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Activity monitor not showing all memory

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https://discussions.apple.com/message/11022205?tstart=0#11022205
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http://support.apple.com/kb/SP7
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Seems strange and sad to me but I suppose it is true.
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MacPro sees 16g mem but Activity Monitor Only Shows 8 Gig

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