Where can I find that information? Does info below help?
Model Name: Power Mac G5 Quad
Model Identifier: PowerMac11,2
Processor Name: PowerPC G5 (1.1)
Processor Speed: 2.5 GHz
Number Of CPUs: 4
L2 Cache (per CPU): 1 MB
Memory: 4 GB
Bus Speed: 1.25 GHz
Boot ROM Version: 5.2.7f1
Serial Number (system): G8******R70
<Edited by Host>
Here's where ou can get reliable Mac RAM for your G5.
So, as you can see, there is still hardware out there to significantly speed up your G5.
The 16 GBs of RAM will improve things considerably.
The faster VRAM video cards means better video resolution and on screen rendering.