Upgrading Power Mac G4, dual 450 Mhz, to use Logic Express 8

I am actually confessing to being a windows studying pc engineer, but am also interested in macs.
My sister has just purchased the G4, 450 Mhz, (dual) i am confused on a few things and am trying to help her!
Basically can anyone help?
The problem is, does dual mean, that there's two processors (i am going to open it later when shes home from work and actually look!) and also, the 450 mhz, is dual, so is that 450 x 2 or just 450? I have looked about this site, and have noticed there is not much room to up the processor speed, but the goal is to get her processor speed up to a minimum of 1.25 Ghz.
Also, she wants to create her own music on a small budget, so cannot afford Logic Pro 7, it is installed on her machine but she has no key? (the guy she bought it from didnt say it needed one!)
So she now purchased Logic Express 8, but when trying to use it, the message is saying to the effect of not large enough processor speed. She has installed it on top of Logic 7, so both are now on there, will that matter?
Is the processor slot the same for the larger Mhz upgrades? if so, which are the best processors to use?
We have all the ram, she bought 1.5 GB, and large hdds, it is just this problem now, and she was in tears last night, due to the fact, every time she asks someone, she gets one step closer, gets hopeful, to find another hitch!
I am really sure i can get it workable for her, but need some apple expertise guys, sorry i know you dont appreciate windows users much, and i would own a mac, just when i can afford one!
All help much appreciated.
semmi

Hi-
Welcome to Discussions!
Sounds like you are dealing with a Gigabit Ethernet model of G4, equipped with dual 450mhz processors. It was a monster in it's day, and still has good use left in it. Problem is, 450mhz, even dual, isn't much by current software requirements.
http://www.everymac.com/systems/apple/powermacg4/stats/powermac_g4_450dp.html
As for Logic- version 7 would be usable on the machine as is. There is no problem with installing version 8 on the same system. It would be nice for her to be able to get the proper "key" to be able to use v.7. It would definitely be worth pursuing the issue with the seller.
And, as you know, to use v.8, you need more processor. Processors are a relatively easy upgrade. There are many options available, as well. One of the best buys (performance for the money) are 7455 based single processor upgrades from OWC or Fastmac:
http://eshop.macsales.com/item/Other%20World%20Computing/MEG42M1500/
http://store.fastmac.com/advancedsearchresult.php?keywords=agp
The following are all compatible with the dual 450 G4:
http://eshop.macsales.com/MyOWC/Upgrades.cfm?model=158&type=Processor&TI=4655&sh oupgrds=Show+Upgrades
You can check an installation video from the following:
http://eshop.macsales.com/tech_center/installation.cfm

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