Age of Conan's new Khitai zones have brought my four-year-old gaming rig to its knees and, rather than run around looking at circa-1998 environment textures (and six minute load times), I recently took the upgrade plunge.
Luckily, most MMORPGs don't have the stringent hardware requirements that a lot of single-player games feature, and you can generally get away with relying on outdated hardware in our particular subset of gaming. For example, aside from a video card upgrade (driven by the silly desire to play Crysis a couple years ago), I've been playing dozens of MMOs on a PC that hasn't been state-of-the-art since early 2006.
What about you, Massively readers? How often do you upgrade your gaming PCs, and has an MMORPG ever driven you to do so?