Not if you have externally powered devices.
Thanks
I'll bear that in mind next time. I bought powered because I'd been reading that the pi is much stabler with them.....It can't hurt. But the question was whether or not it was necessary in order to run a Jalapeno on a Raspberry Pi, and then answer is that it's not.
I knew I saw the powered hub thing mentioned before. Taken from: http://minepeon.com/index.php/Main_Page#Images
Quote
Use a POWERED USB hub
The Raspberry Pis USB ports are limited to 140mA, thats barely enough for a keyboard and a mouse, it WILL NOT run your miner!
The Raspberry Pis USB ports are limited to 140mA, thats barely enough for a keyboard and a mouse, it WILL NOT run your miner!