But, but, it's over there and I'm over here. I can't reach it!

I have a G4 1.5ghz and FAAH takes anywhere from 14-23 hours per work unit. HCC takes around 5-6 hours. Good luck with your decision.

The longer a task runs due to the lesser speed of a device, the more interesting it becomes to familiarize oneself with the checkpointing when the time is there to switch the machine off [full shutdown] or boot. 15 minutes between checkpoints on my quad 2.4 Ghz could be hours on such a G4. 700Mmhz. All about Minimizing Progress Loss you find in the FAQs, item 1-L http://www.worldcommunitygrid.org/forums/wcg/viewthread?thread=21501 on the index.

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I kinda disagree with skgiven on the cost issue. If you already have a device and can afford to put it to use, then it is worth using. If you are an individual that is obsessed with cost/watt/wu, then obviously spending several hundred dollars on top notch hardware will give you more bang for your buck over the long run. I prefer to use what I have and make due with upgrades as I can afford to. I wouldn't for example save the $20 each month it would cost to run the old system and put it into an account until I can purchase the parts for a new energy efficient system.

Edit: And I have systems from quads all the way down to a 266MHz currently crunching on WCG and other projects. They may not put out a lot of points, but like others will say, every little bit counts.

Edit2: And, as long as the system can run the WU's, they are worth as much as any other system for new badges. Sometimes they are worth more like in the case of BETA units. Because they will run longer.