Quote from: bathrobehero on November 21, 2015, 09:12:53 AM

Quote from: chrysophylax on November 21, 2015, 06:38:21 AM

Quote from: bathrobehero on November 21, 2015, 06:33:53 AM

Quote from: chrysophylax on November 21, 2015, 05:47:44 AM

Quote from: bathrobehero on November 21, 2015, 05:29:47 AM

Quote from: CoffeeCat on November 21, 2015, 12:05:15 AM

So perhaps this is a bit off topic, but you guys seem like a knowledge group. Are the 750 ti's the most power efficient of the of the Maxwell cards? Thanks.

It greatly depends on where you live; for me the 970s are the best choice by far even if I only go for 4 x 970 per rig, but of course I also add 2 x 750 Ti.
While a 6 card 750 Ti rig looks great on paper, you can't really disregard the price of the whole PC itself (mb+cpu+memory+hdd+psu) which all adds up, disrupting the efficiency/ROI of a 6x750Ti rig. But of course YMMV.

ill be building a 6 x gigabyte 980ti g1 miner very shortly ( when the funds allow ) and will have the results in comparison to the 6 x gigabyte 750ti oc lp miner ...

this should give an indication ( hashrate also ) of how efficient these two machines are ... admittedly - ccminer-spmod - it will be a huge hashrate difference - but power efficiency will be the question with this - not hashrate ...

i am actually hardpressed to believe that the 6 x gigabyte 750ti oc lp miner would not be more efficient than the 6 x gigabyte 980ti g1 system ... even if all the computer power consumption is taken into effect ...

obviously this is not using the 970 as you specified - but i dont think thefarm will be upgraded to the 970 card - so i couldnt test that anyway ...

#crysx

As I said it depends on how much you can get your hands on certain cards. To me for example a 980 Ti rig (or even just a 980 non-Ti rig) would be suicidal. And then again putting 6 of those cards into one rig would require a very pricey PSU unless you don't care about RMA time or resell value, or don't mind using two PSUs which I personally refuse to do.

In my personal case 960s are sligthly more efficient than 970s and 750 Ti's but I decided to only use 2 types of cards in order to simplify things so I'm only buying 970s and 750 Ti's until Pascal comes along which allows me to know the efficiency of the cards depending on the algo without having to calculate it. More cards would just complicate things.

understood ...

the psu count IS a pain in the backside - especially due to the fact that not is it more power - but a lot more space required to run them ...

thefarm itself being upgraded to the 980ti g1 is highly unlikely ... ONE miner for testing and high level hashing - possibly ...

i too am waiting on the pascal chips / architecture to hit the market - but even then - the cost would be iitially a great deal until they settle in the market and drop to a price for general use ...

so you think the 960 cards are better value? ... ill look into this and see what we can get them for here in australia ...

tanx bathrobehero ...

btw - i have not ever really looked heavily into the resale value of any of the cards - as you can never really get back anywhere near what was originally paid for them ... i usually average it out at less than half of the original cost for resale - IF i ever resell them ...

#crysx

Resell value is important to me since I realised how much the 780 Ti's dropped when Maxwell arrived and how much of a stigma is associated with GPUs used for mining (mostly because of careless AMD miners) which I always disclose.
I built up a reputable seller status on a couple of sites and I always take good care of my cards (low temp target, no +voltage, no max fan speeds, regular maintenance, etc) so if things rapidly change I can get rid of all my cards fairly easily.

Quote from: dominuspro on November 21, 2015, 07:58:54 AM

Using 2 PSUs with USB powered risers + http://www.aliexpress.com/item/Add2PSU-Multiple-Power-Supply-Adapter/1743678544.html?spm=2114.01020208.3.2.oKvSMv&ws_ab_test=searchweb201556_2_79_78_77_80,searchweb201644_5,searchweb201560_9 is very simple and secure in my eyes.

I've been using this setup for something like half year.

I just don't feel comfortable using two PSUs with one rig even if it's reportedly mostly safe. In fact I tend to spend way too much on high quality PSUs but they tend to keep their value pretty well so it's not that much of a loss long term (especially if you get a beast with 10 years of warranty).
I'm planning to look into some server grade PSUs since even high capacity ones are dirt cheap comperatively (just take a look at ebay for example). A friend of mine with an oscilloscope already offered to check them out for their power delivery quality but I'm at the limit of what I can currently draw so it'll have to wait. Though, I'm curious if anyone ever used server grade high capacity PSUs for mining.

i tend to agree with you on the resale value of good quality maintained stock ... i am the same with taking care of the cards - especially with maintenance ... anyone that knows me knows how i am with the servicing and maintenance of the equipment i have ... though people here wouldnt for obvious reasons

... between the high end servers and thefarm - i am equipped to run a mid size corporate ... im not even joking in the slightest ... so i do understand and appreciate where you are coming from ...

i just dont care too much for resale when it comes to these things ... as they lose value regardless of how they are maintained - its just a matter of how much they will lose in value when they are being resold - if they are resold ...

in anycase - i hope that pans for you in the long term ... its a good way to keep upgrading and staying ontop of the current technologies ...

as for the psu setup ... ALL of farmamd required dual psu systems ... ALL of systems have been running non-stop for at least two years ... only now did i require to pull farmamd down for warranty repairs - only to find most of the cards are not warranted any longer ...

so the setup itself didnt kill the cards - infact quite the opposite - farmamd has been running really well for most of this time ... it was always the external issue - like power outages and heat and actual failures in the fan systems gigabyte have ...

i should be back online with the amd cards as soon as i get them back ... in a few weeks ...

#crysx