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one little paper flaw or jam and you've wasted a ton of ink and media since you can't "stop" one of the two jobs...they're combined.
I'd say add all the memory you can to the printers...this helps speed workflow more than almost anything, since it's just a buffer for the printer. You lose time when your server has to "look up" another part of the job and send it...it's not the sending that's the time killer, it's the seeking the info and buffering it, and the more jobs you have that server doing, the harder it has to work if it's having to send smaller "pieces" to the printers.
Are you printing a lot of single copies of a ton of different items, or lots of copies of lots, or a ton of a few?
I doubt you'll need multiple network ports for any of it...if I recall correctly, we figured the Nova 850 in octachrome mode with 60" media (300x300 dpi) was taking about 1 meg. per pass, so even a 10meg. ethernet card wasn't in the least taxed to keep the printer happy.
I ran all my stuff - 1 Photoshop workstation, 1 RIP station, 3 wide format inkjets (Nova 850, HP1050c and an older Nova III 36"), web server, ftp server, File server, 40" 9600dpi Vidar scanner workstation, high speed Ricoh scanner/copier, and 3 OCE 9800 series 36" b&w digital scanner/copiers all off a 16 port 100 mbit switch and never had any traffic congestion. The file server was a dual Pentium 450 with 2 gigs and 4 wd 120gig EIDE drives in Raid 0+1. This file server was tied via a T1 to our "sister" company in another city and we kept around 80 gigs of scanned documents and engineering blueprints on servers in both offices. Anything scanned at either location was mirrored to the other once every 4 hours.
I'd put all the "power" in the RIP stations...that's the most CPU intensive. Ideally, I'd build individual RIP stations instead of multi CPU stations...2 CPUs or any dual core isn't going to perform as well as a entire computer dedicated to the job. If you do go dual core, quads, etc., I think I'd do AMD instead of Intel...the memory bandwidth of the AMD CPU kills Intel on something like this that's so memory intensive.
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