While crunching, run System Monitor --- Resources tab. It will show the memory usage. And it will also show the swap file usage. If swap file has significant percentage, then more memory would help.
Note: I usually reboot before this test because the swap file usage is reset at that time.
If only a small amount of swap is used, it just means that everything will take a little longer.
In Ubuntu 12.04 LTS desktop you need 2.3 GB. 2.6 GB if Chrome has 32 tabs open.
In 2004 I ran a headless linux that booted from 3 1/2 floppy and ran in memory SETI. All that was connected was a power supply, floppy, Ethernet cable. The monitor was just to start it up and then unplugged (VGA and HDMI is hot swap-able, {I didn't have the guts to try my digital monitor and see if that works also and I still broke it in a move.} and the keyboard was pulled after start-up commands. Something back then I faintly recall we used someones computer on the internet that stored a queue of work units so we could always get some if SETI was down.
Hope that helps. It was a striped down Linux and we didn't have much memory back in 2002-3 boards that were o/c.
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