Limits of making maps?

[Hadrian_II]

Hadrian_II said:
So a 10000 x 10000 map would use: 100 million pixels * 32 (or 16) bit color information. = 3,2 or 1,6 GB RAM space. and i suspect this caused your computer to start swapping, while the 3000*3000 map just needs 288MB RAM what i think fits in your ram.

you need to divide my numbers / 8 that the numbers become megabyte, now my numbers are in mbit. (what would make the numbers a bit less huge)