So do you think that it might be better to build a GPU rig and mine other cryptocurrencies instead of buying a dedicated hardware for bitcoin mining ?
Yep. Plus, you can mine several different algorithms and switch coins more freely to get the most money out of a rig instead of being bound to one algorithm with thousands of miners on it. Check out the alt coin mining section if you're interested in this, the trick is to find a good LGA1150 or AM1-2 motherboard with lots of PCI lanes, and a cheap but reliable processor and RX-470 or 480 cards for best efficiency. As with ASICs, don't cheap out on a psu!
Start reading this thread:
https://bitcointalk.org/index.php?topic=1584973.0It has a lot of good info in it. I posted a message in that thread with a
bill of materials for an under $1,100 4-GPU mining rig build that could yield 600-800 sol/s depending on how aggressive you are with the BIOS mods and clocking, and which mining software you use (right now Windows 10 w/ Claymore miner seems to be best). Granted you may not be able to get that pricing (USA prices and some special rebates), but you can use that as a baseline.
Cheers,
- zed