"What is the storage/memory capacity for the CF-18 Toughbook?
This depends on the specific model number:
CF-18B/C (Mk1) -- On-board 256MB. Expandable to 768MB
CF-18D/E (Mk2) -- On-board 256. Expandable to 1,280MB
CF-18F/G/H (Mk3)-- On-board 256MB or 512MB. Expandable to 1,280MB or 1,536MB
CF-18K/L (Mk4) -- On-board 512MB. Expandable to 1,536MB
CF-18N/P (Mk5) -- On-board 512MB. Expandable to 1,536MB"
Toughbook Support
1GB extra appears the limit so the 2GB modules can't be used. The type of RAM (DDR or DDR2) is a little ambiguous as earlier models appeared to use DDR & the later DDR2. I'm guessing yours are DDR going from the 1GHz CPU and 40GB drive.
Assuming DDR, extra RAM will be relatively expensive but running XP in 512MB on a slow processor won't be very nice. 1GB should be sufficient, particularly as they won't be overtaxed
Hopefully the 512MB RAM already installed is all on-board so the RAM slot is free to take another 512MB.
Model type:
Locating Toughbook Model Information
Collection of info:
Panasonic Toughbook CF-18 Thread/FAQ