16 Gig of RAM but only 3.2 gig showing as available in CS5

Hi,
This is my first post so I hope it is in the right place.
I have just received my new machine. It should be quite a monster. It is a top of the line i7 2600nCPU @ 3.4 GHz running Windows 7 64 bit  with 16 gig of RAM and 3 drives. Drive 1 for windows and programmes; Drive 2 for data and Drive 3 (a crucial SSD) for the photoshop scratch disk. So it can access Open GL it has a Nvidia GeForce 570/PCI/SSE2 graphics card. It is a fresh install. There are no other programmes running.
After the instal the first thing I did was go to edit -> preferences->performance only to find that I only had only 3,255 MB of ram available. I would have thought that is way way low. I was expecting somthing more like 15,000 MB.  Does this sound right and if not what is going on here?
Also, I plan to be working with HDR photography with up to 9 full res shots (captured Raw) with lots of adjustment layers. I have set cache levels to 4 and tile size to 128K. Does this sound about right?
Thanks for your help.

Hi Noel,
Thanks for that. Reinstalled and chose the right options this time. Now I have 14.6 gig of available RAM - much more like it. I have set ram to 90% (13200).. or do you suggest I stay within thier reccomended range of 8066-10560. Bear in mind that I have s fully dedicated high spec 128 gig SSD drrive sitting there as the nominated scratch disk.
Again thanks for your help.

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