Topic: My 1 gpu now 11gpus 5rigs for Ethereum. 45 days of mining. Photos thoughts. - page 19. (Read 50633 times)

 4 fairly comfortably, 3 with TONS of headroom.
 That's similar power consumption to my R9 290s, and I'm running 2 rigs with 2 of them and an A10-7860K VERY comfortably on the X-850 - 660 watts at the wall or some such so only pushing about 600 watts actual consumption.

 Rest of the system is eating close to 100 watts - if you build a 4-way system for efficiency should work out to more like 1050ish of the 1250 rating.





 See above, VERY safe with a good quality power supply.

Is it 'safe' to keep the kill-a-watt meter plugged in 24/7 or should I be removing it from the circuit when I'm done fiddling with voltages and speeds?

 I don't worry about silent. I worry about AIRFLOW.

 Delta EHE and SHE models are my FRIENDS!

 But yes, I always plan on the 3+4 pin connector setup option on them.


My most recent "monster" came in this case - Newegg "Avatar Scryptminer" unit that I seem to have gotten the last one of (they have a different version with a higher-end CPU but only 2 GPUs still available, same price IIRC).
I did swap one of my R9 290s into it in place of one of the R9 280x it came with, and might swap one of the other 280x for a 290 out of one of my other systems for better cooling.
For scale - it's 25-26 inches long AND high - biggest case I've ever worked with.

http://www.enermaxusa.com/eca1092ag.php

 I figure it will, LONG term, become a serious file server, and short-to-medium term my "system to clone" machine.
 I don't think I've ever seen a non-propriatary motherboard (including ALL of the EATX multi-CPU boards I've worked with) it won't fit EASILY.
 The one down side it the bloody massive SIDE air intake - front intake is fair but won't fit 38mm fans as far as I can tell and the drive cage blocks a lot of the airflow from the front. Lots of top and bottom intake area though, even if I used dual PS (it's specifically designed to fit 2 standard ATX power supplies) - and with riser(2), it will fit *5* dual-slot cards IN THE CASE by design (or if you could find the RIGHT motherboard possibly without the risers). The Biostar below + 1x 1-16 riser would work for 5 cards that way - no cutting needed.

 Down side - top-mounted "front panal" but this thing is soo big it almost HAS to be floor-mount, which mitigates that issue somewhat, and I DO like the "drive dock on top".



 The case you listed only has 7 expansion slots - you CAN'T build a 4-card rig in it as the dual-width cards won't FIT.

 I used this on a previous build - it works but I'm not real happy with it overall.

http://www.newegg.com/Product/Product.aspx?Item=N82E16811133271&cm_re=versa_case-_-11-133-271-_-Product

Can't mount 38mm fans in the front without cutting some of the plastic off on the inside of the front panal, and I'm finding the top-mounted "front panal" stuff to be a pain to work with. Your milage might vary.


 Was thinking about that one for a 4-blower-type-GPU build at one point. Biostar don't have a HUGE great rep but I've had good luck on longevity out of their motherboards, just not the highest feature or performance.

That is pretty amazing.  With cards that close I would be worried about doing that but you're proving that it works and it seems those little hdmi caps are doing their job lol.

from where i live there are only two wires, one live at 240V and one neutral.

84-87 f

these rx 480 cards are amazing  temps are 72c 68 c 68 c 65 c pulling 94mh at 540 watts
using a plat cosrsair ax760



i mix cards i have a rx 480 and a r9 390  running as I type they do 56mh and use 480 watts  the 390 is a power hog get 32h the 480 gets 24mh

default is a r9 390 + rx 480

rig 1 is 4 rx 480's 3 are sapphires one is a diamond.

rig 7 is two r9 390s'

  I am mining with qtminer just eth coin   I spend 2500 watts for about 310mh  you are spending more watts about 2800  for dual mining.  I am maxed for heat it was 92f today  and I can't run more power then the 2400-2500 watts.  So we are near the same hash what do you eran with the second coin?
i figure it cost you 400 - 600 more watts  which is 12 kwatts a day and maybe 360 -375 kwatts a month.
at my insane summer prices of 18 cents I need 67.50 $ in extra power   about 2.25$ a day does the second coin earn $5 a day?

I already has two full set of all the components, so I don't have to take it into account. One guy pointed in my thread that I shouldn't mix cards from different series. I guess that I'll have to fill my R9 380 platform with R7 370 and then put RX 480 in the new one.

i think you did not calculate the mobo memory hdd prices.

since finding a kill-a-watt for 240V is rare and an existing one which can operate at 110v-240v is expensive

i found a solution for me:

tools needed:
1) clamp amp meter with voltmeter or clamp amp meter and a voltmeter
2) extension outlet (live and neutral wires are separated)

i already have a clamp meter with a volt meter that looks like this.



ill measure amps and volts

ohms law say amps x volts = watts

 Comparing to ANY R7-series card is a non-starter, those aren't even LOW END cards by mining standards and are fairly inefficient when you factor in total system power consumption.

A good PSU (ie. EVGA-Gold, Platinum) will let you exceed the limit for spikes etc. but I don't think design of PSU is for you to constantly over the limit. Infact, a good practise is to consume 80% of the PSU so that there is safe buffer. This will surely keep the PSU running safe and within limits. This would also mean that your other components like mobo, GPUs, CPU etc are kept optimally powered... so your overall investment is protected and perhaps your chances of recycling or selling them off in the future is very good.

Mining is 24x7 affair (unless your need to cut back during summer etc), 850w PSU is good enough for 2 x GPU rig, running 24x7, as long as you have proper cooling like fans etc. The 390s runs very hot.

i guess phil you really hate risers, with those setup, they are only good for bringing problems

but with those temp you have there, it must be also cold there

390 is 270w in dual mining?

how many 390s can run full speed in a seasonic x-1250?

The power consumption has been lowered to 60% or less of stock. That helps. Would not want to over clock in that arrangement.

i don't have a kill-a-watt device.. i have a 850w PSU with a 390x and a 390 ..24/7

EDIT: anybody know where can i buy a kill-a-watt device for 240V?

those cards are way to close to each other for my liking

All make sense!

Question - I have 2x R9 390 on one 850W PSU

Is it safe to use it 24x7 with default GPU settings?

The 390 is power hogger, I once metered it at 270w per GPU full speed (31-32MHs) and at 6 cards, almost 2000w (when dual mining), when I had to do a 2 x PSU setup (1300w x 2).

Although it was nice to get a monster rig at 185-190MHs but you sacrifice a PSU (which you could have used for 2nd rig) and drawing too much power from a 20A power point (dangerous). Keeping this setting this way will be too dangerous and will surely kill your PSU sooner or later.

With several good tips from Philip and other senior members, I settled for 5 x PSU design, with max underclocking and slight overclocking using Afterburner. I may sacrifice some MHs, but it keeps the rig investment safe and also prolong life of PSU and avoid shorting your whole house! Also, you can certainly get more MHs from 2 rigs with 1 PSU each (ie. 5 x 390 = 151MHs with 1600w PSU, times 2 = 302 MHs total for 2 identical rigs).