Manuals and User Guides for Dell GX260 - Optiplex Pentium 4 2.0GHz 512MB 40GB CD. We have 6 Dell GX260 - Optiplex Pentium 4 2.0GHz 512MB 40GB CD manuals available for free PDF download: System User's Manual, Service Manual, Setup And Quick Reference Manual, User Manual, Disassembly, Features List