Cluster and Xserve g5

Hello,
Can somebody tell me what's the difference between cluster nodes and the Xserve g5's. I was looking at the Apple store at the dual 2.3ghz processors and the difference that I see is that the xserve g5 has a combo drive and an unlimited client server for $3999 the cluster nodes are $2999.
I need the machines for a render farm.
Any advise is appreciated.
Thank you,
Helmut

The other limitations are no optical drive in the cluster node, and a 10-client license which applies to file sharing via AFP and SMB.
If you're not using it as a file server and can live with one drive bay and no optical drive, then you can save $1000. A render farm is, as Camelot mentioned, a perfect fit for the cluster node.

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