Block Erupter USB from Sapphire
The ASICMiner Block Erupter USB 300MH/s Sapphire is well available right now but is it worthwhile? Compared to any GPUs it definitely is, often available for a price of ~12$ it is offering 330MH/s with only at an electricity usage of 2,5 Watts. In the basics it is looking like it could be a worthy investment or just an easy and affordable way to get a good hashrate if you want to do some mining.
Creating your USB ASIC mining rig
With a 9-Port USB Hub you can reach a hashrate of nearly 3GH/s at a power usage of about 25Watts, if you compare this to a AMD 7950 doing about 500MH/s at 130Watts it is way more efficient. So if your electricity prices are low or even free it is well worth creating a little setup. But since the Block Erupter does run a bit hot an external fan would be good, if you don’t have any you can use an USB fan like this one. This will limit the available slots on the Hub to 8 instead of 9.
What can you expect from this rig?
Great profits won’t be made anymore with this rig but to start doing some mining on SHA-256 based currencies like Bitcoin, Terracoin, PPCoin or Freicoin it is an affordable solution. GPUs are inferior in these days compared to any of the FPGAs or ASICs and pretty much all ASIC suppliers out there with powerful hardware have long delivery queues due to the huge amount of pre-orders. For some it is not even sure whether they will deliver at all.