bamboo will run happily on any modern webserver, in terms of what resources it uses itself its actually got a small footprint
The real challenge is the builds you are running and only you can know the type of hardware that these need to run on:
"For Bamboo, the minimum hardware requirements depend on the size and complexity of your plans. Considerations include:
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Bamboo 5.9 will no longer be supported after June 12, 2017. What does this mean? As part of our End of Life policy, Atlassian supports major versions for two years after the first major iteratio...
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