You can upgrade to 2GB. (1024MB.512 MegaByte + 512MB = 1024MegaByte1024MB = 1GigaByte )It is DDR Sdram.(Double Data Rate Synchronous Dynamic Random Access Memory)It is also SO-DIMM, as used for laptops.(Single Outline Dual Inline Memory Module)
http://en.wikipedia.org/wiki/SO-DIMMThere are 200 gold plated contact pins. 100 on each side,
http://en.wikipedia.org/wiki/File:1GB_DDR2_SO-DIMM.pngNote the Locating Notch on the bottom, and how it is off to one side.Note the Side Notch on each side.There is a Locating Lug in the bottom of the ram memory slot, for the laptop.The ram memory module must be turned to the Locating Notch lines up with the Locating Lug.There are spring clips on each side of a ram memory module.The tops of the spring clips are eased to the outside.This allows a bump, or protrusion on the spring clip, to come out of the Side Notch.When the ram memory module is ensured to be seated correctly, in the ram memory slot, the spring clip 'bump' will be in the Side Notch.A laptop ram memory module is removed AT AN ANGLE!NOT too much more than the angle it is in, when installed in the ram memory slot.After the two spring clips are eased out, the ram memory module will pop up a little bit.Slide it out AT THAT ANGLE.If you it up to a straight up position, you will damage the gold plated contact pins of the ram memory module, and the contact pins in the ram memory slot.Damage the contact pins in the ram memory slot, and you are looking at motherboard replacement.Everywhere on the ram memory module is the BODY, except for the gold plated contact pins.Handle the ram memory module by the Body.The Body is coated with a see-through protective plastic.Refrain from touching the gold plated contact pins.[ DDR Sdram IS DDR1. Double Data Rate Sdram.DDR2 Sdram is Double Data Rate 2 Sdram.DDR3 Sdram is Double Data Rate 3 Sdram,1)
http://en.wikipedia.org/wiki/DDR_SDRAM2)
http://en.wikipedia.org/wiki/DDR2_SDRAM3)
http://en.wikipedia.org/wiki/DDR3_SDRAM It is the Technology used, not referring to the size ]DIMM for desktops, Dual Inline Memory ModuleSO-DIMM for laptops. Single Outline Dual Inline Memory Module.You need SO-DIMM, with 200 pins, and it's Frequency Rate, ('Speed'), is rated at 333Megahertz. (333MHz)That is PC2700.
http://h20000.www2.hp.com/bizsupport/TechSupport/Home.jsp?lang=en&cc=us&prodTypeId=321957&prodSeriesId=449877&lang=en&cc=usUnder the bold black subheading -Resources for HP Compaq nx6110 Notebook PC,click on - ManualsUnder the bold black subheading -Quick jump to manuals by category:,click on - Service and maintenance information - in blue.Under the subheading - Service and maintenance information -,click on -HP Compaq nx6110, nc6110, nx6120, and nc6120 Notebook PCs -Maintenance and Service Guide(1 Oct 2005 )This is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.After you click on the file name above, it may take up to 30 seconds, before the first page comes up.In the Bookmarks menu to the left, click on the + sign to the left of -Removal and Replacement Procedures.Scroll it down, click on -6.7 External Memory ModuleThere is also an Internal Memory Module -6.17 Internal Memory Module.You can put UP TO 1GB in the Internal memory module slot, and UP TO 1GB in the External memory module slot.For additional questions please post in a Comment.Regards,joecoolvette