My machine only use 4-7%... not sure what an older system like yours would use or whether there is something else going on.

Here's my datamap files and G19 layout for those that want to see how its put together..

I added temp bars to CPU cores, GPUs and water and edited some icons and imagemap files. I now get orange indicators for when pumps, fans or flowrate are at maximum, and triangle warning when low or exclamation alert when below minimum. Temp alerts are the opposite going from low to exclamation alert.

I run my datamap files and XML from the C: root directory.
The eos-19 Layout from the layout folder using my eos-aquasuite layout.

PS. you need to create the sensor xml export files in Aquasuite using the same file names as my datamap file names without the .datamap;
For example gpu-rad1-fan5-speed.datamap.txt you put gpu-rad1-fan5-speed as the filename in Aquasuite XML export for the fan sensor. The other XML export files you need to name the same way.
To use my layout you'll also need Aida64 and MSI afterburner, otherwise you'll need to remap those sensors to whatever tools your using.

At idle - normal temps

At load after a few minutes.

At load after 20mins


Mapfiles and XML tool along with LCDHost eos-19 layout stored on Skydrive. (im using eos-Aquasuite layout)
http://sdrv.ms/11bxQRr