750Ti still seem like a really good choice imo.
I guess the prices will go down a bit also now when new cards show up ?
Me myself are buying used 750Ti:s for like 80 bucks.
All my 750Ti:s produce around 7.1-7.3Mhs @Quark superstable.
True. But when you consider the fact that you can only fit so many cards in one box, looking at performance per card starts to be a bit more important. One box with 6x 960 should be about the same (probably better) hash/watt as two boxes with 6x 750ti each, but with significantly lower upfront cost.I guess the prices will go down a bit also now when new cards show up ?
Me myself are buying used 750Ti:s for like 80 bucks.
All my 750Ti:s produce around 7.1-7.3Mhs @Quark superstable.
-- SNIP --
The "case" wasn't really the point of my comment though. CPUs, motherboards and all of the rest of the stuff is mostly irrelevant when it comes to hashrate. So, IMO, spending money and power on them is wasteful. I just snagged a http://www.asrock.com/mb/Intel/Q1900M. Performance is the same on that puny 10W quad-core with a 960 and 750Ti installed as it is in my workstation with 84W i7-4770, 32G RAM, etc. Now if I can get a hold of some PCIe port multipliers and scale that out to 12 GPUs without performance degradation, I think I'll be onto something...
i cant remember exactly where the post is - but i know it was in the sgminer-dev thread that the guy proved that it can be done ... have a read through as im not in a position to get the exact post - apologies ...
port multipliers are great IF the system is capable of handling ... i have tested a few - and run into dead ends with the drivers ( stock and without modification ) for amd - but have no idea about nvidia ...
after the amount of work involved trying to set it all up - and i dont mean a few hours - it was more beneficial for me to spend the time ( and money ) on growing the farm in other ways ... even at the loss of a little bit more power for more systems - and i mean a 'little bit' more power ...
from what ive seen also - if the miner has the cpu active on thefarm - it has such a little effect on the hashrate - but a HUGE effect on the power consumption ... cpus chew too much power for the little gain that you get from them ...
when you consider that two of our gigabyte 750ti oc lp cards chew through about 100Watts of power and output about 5700KH - while the cpu alone chews through 95Watts of power on its own and increases the hash rate by approx 10KH ... id rather put another two gpus in ...
for the moment though - density is the limiting factor BUT is not an issue for thefarm ... the rebuild continues ...
btw ... the further you delve into a 'custom' system that requires mods and changes - the further issues you will have when it comes time for maintenance and breakfixing ... its why we stay with stock and standard for a 7 minute replacement ( including OS using images ) than a hairpulling hour or more fixing a break ... all this at the small cost of some extra electricity that is used for more systems ...
so agreed that this method WILL use more power per machine - but there is VERY little downtime using a stock system ... which means the machine gets up mining much more quickly ...
thats a compromise we are willing to accept ...
#crysx
This fork of ccminer support 32 gpu's in one rig. I have only tested it successufully with 7 cards. Motherboards that have 7 pci-e slots are more expensive than the btc- boards with 6 slots. I can get two 6 slot boards for one 7 slot board.
You should pick up a cheap bitcoin board like this:
http://www.asrock.com/mb/Intel/H61%20Pro%20BTC/
http://www.asrock.com/mb/Intel/H81%20Pro%20BTC/
And then buy a cheap celeron cpu. 4gig of ram is enough.
With the H61, and H81 you dont need powered riser cables, since you plug extra power directly into the boards.
For a 6x ti rig, cheap risers like this one is enough:
http://www.dx.com/p/pci-e-1x-to-16x-riser-card-extension-cable-15-5cm-length-100061#.Ve02T_ntlBc