Depends. Single core or dual core? If dual, uncheck it.
To test stability, use the custom test, and in the window that pops up, set Min FFTs to 8k and max to 4096k, then uncheck "Run FFTs in place" and for memory, set it to around 200MB less than actual RAM, e.g. if you have 1024MB of RAM, set it to ~800MB. If you have a dual core CPU, split it between the two instances of SP2004. This keeps it from using the page file, and tests both RAM and CPU. Run for 24 hours or more.