Ere are the specs on the Mac I need more power on. Mac Tower Processor 2 x 2.26 GHz Quad-Core Intel Xeon Memory 6 GB 1066 MHz DDR3 ECC Graphics NVIDIA GeForce GT 120 512 MB Serial Number H00354XF20G Software OS X 10.8.5 (12F45) Harddive 640 GB SATA

Question

ere are the specs on the Mac I need more power on.
Mac Tower
Processor  2 x 2.26 GHz Quad-Core Intel Xeon
Memory  6 GB 1066 MHz DDR3 ECC
Graphics  NVIDIA GeForce GT 120 512 MB
Serial Number  H00354XF20G
Software  OS X 10.8.5 (12F45)
Harddive 640 GB
SATA Disk
(2) Harddrives 1 TB
SATA Disk
RAM 6 slots total  -- 6 are filled with 1GB
(3) UAD Quad cards installed
I use this computer stictly for audio recording. 
Pro Tools 10.3.7
Interface Apollo 16
Pro Tools is curretnly not compatible with Maverick.   Also, I believe that Pro Tools 10 only allows 4GB ram to be utilized (not sure ) 
I know Pro Tools 11 allows more, but not sure how much more.  Also not sure if the upgrade to Pro Tools 11 I will have to purchase all new plug ins or if my existing ones will continue to work in it.
The platform changes from 32 bit to 64 with the upgrade to 11
If it is as simple as adding more ram, what mode-part #l would you recomeend.  Can the processor be upgraded also ?
The new tube like Macs are non compatible with UAD Cards.  Those cards a must my sessions

Answer 1

You can use Activity Monitor to check if apps run as 32 or 64 bit - simply look at the "Kind" column (you may need to select it under View -> Columns) and see if the app in question is listed as "Intel" i.e. 32 bit or as "Intel (64 bit)".
While in Activity Monitor you can also check if Pro Tools is close to the 3-4 GB limit of a 32 bit app - if you aren't you will probably not benefit from more RAM.
Your MacPro (it appears to be a Early 2009 model) should have come with a small booklet showing how to install RAM and what kind of RAM that you need. Any RAM that fulfills the requirements should work but your safest choice is probably to buy from a retailer/online store that supports Macs as they will usually know what kind of RAM you need for your mac model.
Upgrading the CPUs should be possible, but I haven't seen Apple document how to do this, so you will probably have to google around a bit to find instructions and CPU part numbers.
Your choice of CPUs will also be limited by the motherboard and CPU socket so you may be limited to faster version of your current CPU chip and some slightly newer versions.
Going from your current CPU to the fastest version included in the 2009 MacPros would be going from 2.26 GHz to 2.93 GHz. This would only give a modest 30% speed boost. Using newer and highly clocked CPUs might boost this somewhat more maybe to 50% ?