Is there much difference btwn dual 1.8ghz and dual 2.0ghz

Hi,
I have seen a dual 1.8ghz (M9454LL/A) second hand with this spec:
Machine Type: Power Mac G5
Machine Model: PowerMac 7,3
CPU Type: PowerPC G5 (2.2)
Number of CPUs: 2
CPU Speed 1.8GHz
L2 cache (per CPU): 512KB
Memory: 1.25 GB
Bus speed: 900MHz
Graphics Card: GeForce FX 5200
ATA Bus (DVD): Pioneer DVD-RW DVR-117D
Serial-ATA (hard-drive): Maxtor 80GB
for a good price around £800 which would leave me with money to buy a monitor.
This model already has airport built in and additional ram added.
I am a music producer (running digidesign protools LE) and need a studio computer to see me through the next couple of years. I have been looking at getting a dual 2.0ghz machine but these are invariably more expensive and I would have to pay to add the features this model already has, as well as purchasing a flatscreen.
Basically I want to know how much of a performance difference i will see between a dual 1.8ghz machine and a dual 2.0ghz machine.
cheers guys

Ok that dual 1.8 is not much difference from a dual 2
Your dual 1.8 has a 900 Mhz front-side bus per processor
The dual 2 has 400 more Mhz total in CPU speed (not much really) and a 1000 Mhz frontside bus per processor.
So the difference is minimal.
You could upgrade that video card to a AGP ATI X800 and 3D game all the latest ones with no problem. (I would before they are all gone)
If you get yourself another internal hard drive, something large like a 250-300GB SATA and keep your user files in there instead of on the 80GB Maxtor, your performance "feel" would be pretty good as well. (no Western Digital, they upgraded their SATA specs)
And you got a Superdrive, so you can burn dvds.
If time doesn't equal money, and your not constantly pushing your CPU's day and night, this machine is a good buy IMO. You should get a good 3-4 years out of it, especially if you know when to stop upgrading the OS/apps.
Yes I say you got yourself a good buy there.

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