Why does my memory max out at 70% (using iStat) @ 2x1GB RAM 667mhz

Hi,
I'm using iStat as a monitoring service and I have 2x1gb RAM installed and a 2.4 core2duo processor. I run multiple programs at once (Firefox, Dropbox, MS Office, iTunes) and my memory hovers around 71% all the time (it gets sluggish around 70%). It never has gone up or past 74%. I figure it should max out around 100% right? I recently upgraded to 2x2gb or 667 memory. Will I still have the same problem of hitting a threshold? How do I get rid of this ceiling? Thanks!

Hi bmose14,
I'm not entirely sure how iStat Pro monitors RAM (I always use Activity Monitor for that) but I know Snow Leopard changed how RAM is monitored. Previously in Leopard if you had, for example, 2GB of total RAM it would show that as available and then just immediately allocate the RAM that's being addressed by the GPU. But in Snow Leopard, I find that I have 1.75GB of total RAM (as it doesn't calculate the 256MB of VRAM my shared GPU is allocated).
I'm thinking you have the Intel GMA X3100 GPU (144MB of RAM) and as such that's being calculated here, in addition to the RAM being used by the programs and OS. With that being said, I don't think you can ever reach the 100% mark. I know I fired up iStat Pro on my machine (prior to responding) and I'm also hovering around ~80% despite Activity Monitor showing about the same as "green" in the pie chart.

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