Hi guys I have decided to join the forum for the reason that I want to assess emerging mining hardwares. Sometime ago where bitcoins were hard to mine using GPU's. Now that several companies started to develop ASIC-based miners, its time to get them scrutinized. Hope we can learn

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First is hardware (GPU) available to mine bitcoin. Its a DIY mining rigs with current specs that we can find in a computer store. Currently, the highest possible hash rate we can achieve is around 10 Ghash/s.
The components are Asrock X79 extreme 11 series with 7 pcie expansion slot + RADEON 7990 (7). Total cost is around $5000 to $6000. ROI :16 years (may vary due to hardware upgrades and bitcoin value) Status : Readily available.
Next would be the ASIC USB block erupter. Each has 330 Mhash/s rate Cost around $25 to $40. ROI : 232 days Status : Readily available.