I was wondering if there was any information about what is the recommended server requirements from basic install to large orginizations.

For example, this would be for a large company.

Multi core/Multi CPU x64 with 2 GHz
4 GB RAM
OS part 100Gb + Data part 100Gb
Bootable DVD ROM
1 NIC

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Tim Maler

The minimum VM I've seen DNN run on (and I mean run, not necessarily perform well) was 512mb.  This includes Sql Express.

Memory is more of a limiting factor than anything else.  Of course you'll need a decent processor but memory is most likely to be the bottleneck.

For small production sites I think about 700 mb memory is the step off point.  The more you add the better your site will be.