64-bit, 8-core and 32 GB or RAM is a pretty typical starting configuration for a Tableau Server (Minimum Hardware Requirements and Recommendations for Tableau Server) and typically the more RAM, the better. If you can at least get 64 GB, that would likely be a lot better. Beyond hardware configurations, a lot of consideration should be given to the process configuration to better utilize that hardware. Check out this article on Performance Tuning: Performance Tuning Examples. On installation, Tableau Server will automatically configure the process configuration but if you have a heavy user load or heavy extract load, the processes could be configured further.
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Everybody's needs are different and thus recommendations are very difficult to give without a lot of details.
Best recommendation is to get as much as you can.
- Get as many cores as you can.
- Get as much RAM as you can.
- Get as much hard drive space and speed as you can.
- Get the fastest network that you can.
Costs will stop you from going too far. After that you will make adjustments to your environment over time as you see how it's used.