Greetings: YES... I've been running the Sonnet Encore/ST Dual 500 MHz for probably 3 years now- NO problems whatsoever. Also, nVidia GeForce2 MX 32MB (no fan); 1.5GB SDRAM; Seagate 120GB Barracuda HD; Panaflo base fan; and Tiger 10.4.8 OS. I can tell you that my Cube feels as fast as my sister's G4 MDD 1.25D... I can't tell any difference in using them, but without measuring performance of course. Good Luck, JWD On Nov 22, 2006, at 10:01 PM, Gary wrote: > I am running Tiger on a 450MHz Cube, with 1.25 MEG RAM, a 32 MEG > RAM ATI video Card and an upgraded Hard Drive. > It has run solid as a rock. > > Now the question. Has anyone installed an Apple dual 500 MHz CPU? > into a Cube? If so, can you tell us about it? Success or troubles > etc.