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its not as flexible as the quake3 engine as in, in terms of system requirements
I'm not sure what you mean by that statement? Kind of stating the obvious seeing how it is a much more advanced engine

With a lot of tweaking the Doom 3 engine will run on a low end system, just depend's what you want out of a game.
Considering an example top end computer running an SLi setup of x2 512mb card's, dual processor, 10k raptor's and decent memory would eat into Doom 3 without a clitch, compare that to a low end system that Doom 3 would be capable of running on :
John Carmack wrote:
1000Mhz Athlon/Pentium CPU.
256MB of RAM
GeForce 1 / Radeon 7xxx level of graphics card
And the Doom 3 engine is very scalable indeed, given what modern computer standard's are capable of today.
Compare the minimum requirement's for the ET engine
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System Requirements: PIII 600, 128MB RAM, 32MB Video Card
It almost seems archaic
So I think your trying to say that the demand's placed on a base rig for Doom 3 are far greater? And you can run the Q3 / ET engine on a much lower standard of hardware?
This is true, but the Doom 3 engine has a far more advanced feature set vs Q3 or ET so would require a lot more 'oomph' This does not however make the Doom 3 engine any less scalable, it is all relative when you take into account how much more advanced the Doom 3 engine is.