Motherboard

No

Nonstandard form factors prevent internal upgrades.

CPU

Yes

Installing a faster CPU of the same type and model is usually possible; however, there can be limitations due to voltage, thermal, and/or BIOS support issues, and clock speed increases will normally be small.

Memory

Yes

Normally, only one or two SIMM/DIMM sockets are available. You may need to remove lower-capacity existing modules to upgrade.

Video adapter/chipset

No

Video is integrated into a nonupgradeable motherboard.

Video display

No^[1]

Nonstandard form factors and connections prevent internal upgrades.

Keyboard/pointing device

No^[2]

Nonstandard form factors and connections prevent internal upgrades.

Hard disk

Yes

Older systems might not have BIOS support for drives larger than 8.4GB. Many systems are limited to 9.5mm- or 12.5mm-thick drives. Drive trays or caddies are often required for installation.

Removable-media drives (floppy, CD/DVD, CD-RW/DVD+-RW)

Yes

Install these internally via modular bays or use externall USB or IEEE 1394 (FireWire/i.LINK) drives.

USB, IEEE 1394 (FireWire/i.LINK), serial (RS-232), parallel (IEEE 1284), SCSI, and so on

Yes

Install these via PC Card/CardBus or ExpressCard adapters.

10/100/1000Mbps Ethernet LAN

Yes

Install this via a PC Card or CardBus adapters.

Wireless 802.11a/b/g (Wi-Fi), Bluetooth

Yes

Install these via PC Card, CardBus, Mini PCI (internal) cards, or mobile daughter cards (MDCs). Internal cards may require preinstalled antennas.