From Brian Harry's (Technical Fellow, Microsoft) blog , here's the system recommendations for TFS 2008 as compared to TFS 2005 (found here).
Quote from his site, comparing TFS 2008 to TFS 2005
Quite a few things have changed since TFS 2005.
- Hardware has progressed and prices have changed.
- We've made an amazing number of performance improvements to TFS.
- We've reassessed the average amount of load that a user puts on the system.
- We've reevaluated the data size that teams of various sizes generate.
The net result though is that our recommendations, while more conservative, afford more users on similarly sized hardware.
Here's the link to his full post outlining his test results, assumptions, etc: Click here
~Robert Shelton

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