Quote from: jedimstr on January 06, 2014, 12:11:12 AM

Quote from: sykal on January 06, 2014, 12:07:04 AM

Quote from: EdBoon on January 05, 2014, 11:53:29 PM

Quote from: sykal on January 05, 2014, 06:04:57 PM

that's some sick hash right there.
That would be about 26 mining rigs with 4 R9-270x cards in each. (about 25k worth of hardware)

Do you have a secret to building cheap rigs? I'm not being sarcastic, just really wondering how it is possible to build a 4x270x for under a grand. by my calculations:

4x270x Rig
ram   $25.00
processor   $42.00
mobo   $60.00
psu   $210.00
hd/memory stick   $20.00
# of gpus   4
gpus total cost   $800.00
hardware (rig/case)   $30.00
adapters   $30.00


Total   $1,217.00
$/KH   $0.68

Always interested in info regarding cutting down costs on rig building.

Considering 3x290x rig in comparison:
3x290x Rig
ram   $25.00
processor   $42.00
mobo   $60.00
psu   $210.00
hd/memory stick   $20.00
# of gpus   3
gpus total cost   $1,887.00
hardware (rig/case)   $30.00
adapters   $30.00


Total   $2,304.00
total KH   $2700
$/KH   $0.85

so actually seems to be cheaper builds on the 270s, obviously costs would go down with more cards, if u compare 7 cards u get:
7x270x = $0.61/KH
7x280x = $0.66/KH
7x7950 = $0.76/KH
7x290x = $0.80/KH

I find this interesting, I had just assumed that 280x was best due to everyone saying it was next best to 7950s. Obviously this doesn't consider power consumption, but i believe the 270x are pretty light on power anyway. But obviously you would need a lot more cards to make up the same hashing so maybe power consumption is a big factor.

270 is one of the best for the $. They use little power, and they run very cool.

For the cost, you can substitute a $4 milk crate instead of a case, a PSU like the seasonic 860 goes for $185, and you can even find 270's for $180.

270 is potentially best when not factoring in power consumption at similar hashrates for the total rig. In that case, when power use/cost is a consideration, 7950 is still king and 280x comes a close second. So if you've got free power, but don't have the capital to go whole hog with a set of 290's, go for the 270.... but if you're paying for the sparky sparky stuff, then you're better off finding used 7950 or new 280x.

How is the 7950 and 280x king when the 270 uses less power?