I'm in a similar situation, looking for a machine to Photoshop 4x5's and also the 6x17's out of my Gaoersi. I've just spent the weekend building a Mac Pro "clone" made possible by this device that fools PC hardware into thinking it's a Mac:
www.efi-x.com
I bought the motherboard and and EFIX chip from
www.expresshd.com
For $1,600 I built a machine optimized for Photoshop as per this article:
www.macperformanceguide.com
Intel Quad-core Xeon running at 3.4 GHZ
8 GB RAM (can go to 16 GB for $400 more)
6 hard drives:
1- 640GB for storing applications only (Adobe CS4, Aperture)
4- 500GB in a RAID 0 array for speed
1- 1 TB for Time Machine backup
a 3-bay hard drive hot-swap array
Blu-Ray burner - make backups or copies up to 50 GB!
Card reader
nVidia 9800GT graphics card for dual monitors
A comparable Mac Pro (adding after-market Blu-Ray burner and additional 3 hard drives to make the comparison fair) = $3789
If I had to do it again I could do it all in 4-6 hours instead of three days, but
1) I had no teenaged son to show me how,
2) I have never built a computer before,
3) I had to learn a few new swear words to expedite the process. : )
I haven't run benchmarks yet but will do do this week.
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