I agree with riba concerning both - internal and external - temperatures, but there's no safe way to run (current available) upgrades without a fan. <http://www.cubeowner.com/forums/index.php?s=168f2bed97a64f923f55072292f682e0&showtopic=5714> I may be pushing my luck a bit, but here are my Cube specifications (please note my fan speed): Mac OS 10.4.8 & Mac OS 9.2.2 | PowerLogix PowerForce 7447A DP 1.7GHz + CPUD v2.3b5 | 1.5GB RAM | Seagate Barracuda V 120GB [8MB cache] | NVIDIA GeForce2 MX 32MB + Spirica Extended Heatsink | Spirica VRM Heatsink | Panasonic DL SuperDrive | Zalman 7V Fan | Apple 17 ADC LCD | Apple iSight | Apple Pro Keyboard [black] | Apple BlueTooth Mouse [original] | Harman/Kardon SoundSticks II | Griffin iMic LM >>>riba at ml1.net 02/01/07 8:35 am >>> External temperature matters as well. If the ambient temperature is lower it will absorb heat from the cube easier. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://listserver.themacintoshguy.com/pipermail/cube/attachments/20070201/e587e813/attachment.html