5x7950 Gigabyte WF3 Rig using 1475 Watts!!!

rograz

hero member

Activity: 575

Merit: 500

Quote from: Amph on June 23, 2013, 11:21:56 AM

Quote from: HellDiverUK on June 14, 2013, 03:53:38 AM

Mining Litecoins (or any other scrypt) uses WAY more power than SHA256. My machine uses 200W more at the wall when doing LTC compared to BTC. So, some people may be comparing apples to oranges here.

no what make the real difference is the voltage, the downclock of the memory, and the psu efficiency

Actually just switching my rigs back to BTC from scrypt without changing anything is a 50-150W/rig drop depending on the type/number of cards.

suprabitz

full member

Activity: 148

Merit: 100

same here 925w on celeron w 4 WF3 7950... that 5th one is probably killing the efficiency it drops like a rock after it goes past 90% or so

Amph

legendary

Activity: 3248

Merit: 1070

Quote from: HellDiverUK on June 14, 2013, 03:53:38 AM

Mining Litecoins (or any other scrypt) uses WAY more power than SHA256. My machine uses 200W more at the wall when doing LTC compared to BTC. So, some people may be comparing apples to oranges here.

no what make the real difference is the voltage, the downclock of the memory, and the psu efficiency

FullLife

hero member

Activity: 503

Merit: 500

Quote from: Mr.V on June 21, 2013, 06:28:56 PM

Quote from: FullLife on June 16, 2013, 05:56:40 PM

I'm pulling about 930W from the wall according to the Kill-A-Watt EZ with this setup:

Z77A-GD55, Celeron G1610 Ivy Bridge, (5) Sapphire 7950s under-volted to 0.968 and running stock clocks (925/1250) hashing @ 570Kh/s.

Are you running windows 8?

Windows 7 for now. I'm switching to Windows 8 though because apparently that's the only version of windows that will accept (6) 79xx series cards on one motherboard.

Mr.V

full member

Activity: 182

Merit: 100

Quote from: FullLife on June 16, 2013, 05:56:40 PM

I'm pulling about 930W from the wall according to the Kill-A-Watt EZ with this setup:

Z77A-GD55, Celeron G1610 Ivy Bridge, (5) Sapphire 7950s under-volted to 0.968 and running stock clocks (925/1250) hashing @ 570Kh/s.

Are you running windows 8?

Charles999

full member

Activity: 224

Merit: 100

Quote from: thedonvon on June 13, 2013, 02:50:41 PM

I am running 5 7950s, Gigabyte WF3 with the f43 undervolted bios and the rig is using 1475 watts at the wall. I just purchased a kill-a-watt meter and am in disbelief. I have flashed the f43 bios to the cards, so the voltage of the cards is now 1.09 volts. That is like 300W per card!!!!! This seems way to high. I have read these cards are supposed to be using less than 200W per card. Any suggestions?

Hard to find a household outlet to run this power level.

LordTheron

full member

Activity: 197

Merit: 100

I have 5 x 7950 in 2 rigs, 2 card rig draws at the wall 714w, 3 card rig draws at the wall around 1080w. So both my rigs draw about 1.8kw and thats fully overclocked. When I did the tests with single card, not overclocked it draw 200w but full overclock increase power draw to over 300w.

ssateneth

legendary

Activity: 1344

Merit: 1004

Quote from: FullLife on June 16, 2013, 06:00:18 PM

Quote from: MinerLT on June 16, 2013, 03:12:39 PM

10x HD7950 @ 3Kw day n night.

That seems really high, you must OC the hell out of them.

Same. I'm surprised you're making any profit at all unless you don't pay electricity.

FullLife

hero member

Activity: 503

Merit: 500

Quote from: MinerLT on June 16, 2013, 03:12:39 PM

10x HD7950 @ 3Kw day n night.

That seems really high, you must OC the hell out of them.

FullLife

hero member

Activity: 503

Merit: 500

I'm pulling about 930W from the wall according to the Kill-A-Watt EZ with this setup:

Z77A-GD55, Celeron G1610 Ivy Bridge, (5) Sapphire 7950s under-volted to 0.968 and running stock clocks (925/1250) hashing @ 570Kh/s.

zackclark70

legendary

Activity: 868

Merit: 1000

ADT developer

Quote from: Slipage on June 15, 2013, 07:58:30 PM

Thinking of throwing a 5th gigabyte card in but might be cutting it fine .

I have a watt monitor plugged into the wall.

Also with my psu comes with a USB dongle and app to read power usage.

Both are reading different wattages. Which reading should I go with when seeing if my psu is big enough to support the wattage on the new card.

My psu is Corsair AX-1200i 1200W i 80+ Platinum Certified ATX PSU

you should be fine i pull under 950w from the wall with 4 cards in the same psu

MinerLT

full member

Activity: 194

Merit: 100

10x HD7950 @ 3Kw day n night.

ssateneth

legendary

Activity: 1344

Merit: 1004

Quote from: BlazinBeaches on June 14, 2013, 01:50:05 PM

Quote from: ssateneth on June 14, 2013, 03:08:57 AM

gigabyte triple fan cards are voltage locked, period. no amount of bios flashes or editing will change that. unless you have the multimeter or kill-a-watt pictures to prove me wrong, this is what you will need to deal with when messing with voltage locked gpus and overclocking with scrypt.

I run 6 x 7970 on each computer, powered by only a 1300w psu. They are all pure reference and I can change the volts to whatever I want. They hum along like any other day, no problems

What PSU? 6x 7970s on 1300 watts? What voltage do you run? That's really good

My 6x7970s with mobo,cpu,ram,etc pull 1650 from the wall. But I also have a bunch of fans hooked up, so it's probably more like 1550. That's at 1.1 vddc. There are 2 PSUs though, one is a 1200 Gold the other is a just a 520 watt 80+. I'm guessing the little psu isn't helping.

**ahh I also have a 3770k on there though, forgot about that. will be dropping in a g1610 this weekend. Got a few of 'em sitting in my closet, just waiting for me to build dedicated racks Cheesy

here you go bro if you guys want to jump on some while they are only $42.99
http://www.amazon.com/Intel-Celeron-2-60GHz-Processor-BX80637G1610/dp/B00B4BJYVU

I haven't measured them recently since they run on ~250 volt and kill-a-watt runs on ~125v. They are likely at or slightly 100% capacity. Clock speeds vary from 1070-1140 (150 mem) and 1.05v. All cards are reference on a Z77A-g45 + G530 or 890FXA-GD70 + 145.

zvs

legendary

Activity: 1680

Merit: 1000

https://web.archive.org/web/*/nogleg.com

i have a system that runs 3x7790 cards at 300mhash, it takes 220 watts

Slipage

member

Activity: 78

Merit: 10

Thinking of throwing a 5th gigabyte card in but might be cutting it fine .

I have a watt monitor plugged into the wall.

Also with my psu comes with a USB dongle and app to read power usage.

Both are reading different wattages. Which reading should I go with when seeing if my psu is big enough to support the wattage on the new card.

My psu is Corsair AX-1200i 1200W i 80+ Platinum Certified ATX PSU

rograz

hero member

Activity: 575

Merit: 500

Quote from: ssateneth on June 14, 2013, 03:08:57 AM

gigabyte triple fan cards are voltage locked, period. no amount of bios flashes or editing will change that. unless you have the multimeter or kill-a-watt pictures to prove me wrong

They wont even accept lower voltage when you underclock them? I've got a few voltage locked cards that works in a strange way. Trixx lets me set voltage to pretty much whatever I want but the actual voltage will only change in the following steps when certain conditions are met.

stock 950Mhz/1.25V

<850MHz setting voltage to anything lower than 1.150V will set it it to 1.150 (or it was 1.125 cant really remember), if you raise clocks above 850 it defaults back to 1.25V

<700Mhz the same as 850 but this time with 0,95V

The way I figured they were working is that they let you set the voltage stages predefined in the "boost" profile in the bios as long as the frequency requirement was met. They are all xfx cards but I tried some other 7950 boost bios' and nothing changed, I just figured most locked cards behaved in a similar way but if the gigabyte ones really are locked like you say I'll make sure to stay clear of them.

And yes, I have confirmed the power consumption actually goes down.

BlazinBeaches

member

Activity: 98

Merit: 10

Quote from: ssateneth on June 14, 2013, 03:08:57 AM

gigabyte triple fan cards are voltage locked, period. no amount of bios flashes or editing will change that. unless you have the multimeter or kill-a-watt pictures to prove me wrong, this is what you will need to deal with when messing with voltage locked gpus and overclocking with scrypt.

I run 6 x 7970 on each computer, powered by only a 1300w psu. They are all pure reference and I can change the volts to whatever I want. They hum along like any other day, no problems

What PSU? 6x 7970s on 1300 watts? What voltage do you run? That's really good

My 6x7970s with mobo,cpu,ram,etc pull 1650 from the wall. But I also have a bunch of fans hooked up, so it's probably more like 1550. That's at 1.1 vddc. There are 2 PSUs though, one is a 1200 Gold the other is a just a 520 watt 80+. I'm guessing the little psu isn't helping.

**ahh I also have a 3770k on there though, forgot about that. will be dropping in a g1610 this weekend. Got a few of 'em sitting in my closet, just waiting for me to build dedicated racks Cheesy

here you go bro if you guys want to jump on some while they are only $42.99
http://www.amazon.com/Intel-Celeron-2-60GHz-Processor-BX80637G1610/dp/B00B4BJYVU

Bakaboy

newbie

Activity: 53

Merit: 0

Quote from: ssateneth on June 14, 2013, 03:08:57 AM

gigabyte triple fan cards are voltage locked, period. no amount of bios flashes or editing will change that.

Not exactly. For Gigabyte 7950 WF3s (AFAIK):

1. The original rev 1.0 boards are not voltage locked.
2. The official bios from gigabyte F43 (1.09V/900Mhz), FY1 (1.25V?/1000Mhz), FX1(1.25V?/1000Mhz) have locked voltages for the Rev 2.0 boards. However, if you use robnitro's hacked FY1 bios, this will allow you to change the voltage using cgminer or Trixx. Wink

I tested this bios and the voltage control works well, however I still run at 1.09 as going below makes the cards unstable @1100Mhz.
3. The FT0 bios was also hacked by robnitro and according to users, the voltage control works as well.

Regardless of the voltage unlock capabilities however, the undervoltage/overclocking capability of each specific GPU is closely tied to the ASIC quality. If you have a card with a very low ASIC quality, chances are you'll have to bump the voltage or even underclock it; depending on what you are aiming for, YMMV.

ma_rine_sa

newbie

Activity: 25

Merit: 0

7950 do have good hash to watt ratio... but you got to lower your hash rate.

best i could do is 5 * 580khash for just over 1000watts

soon as i go over 600 khash it can EASILY go over 250watts each card.

your power consumption is about right but if you really want to save on power you have to shave off the hash rates.

if only btc diff was lower because i was doing 5 * 550 mhash for 840 watts!!!

sucks to pay 27c/kw

zackclark70

legendary

Activity: 868

Merit: 1000

ADT developer

Quote from: HellDiverUK on June 14, 2013, 03:53:38 AM

Mining Litecoins (or any other scrypt) uses WAY more power than SHA256. My machine uses 200W more at the wall when doing LTC compared to BTC. So, some people may be comparing apples to oranges here.

i have 4 7950s scrypt 2,500kh+ 913w frowm the wall including monator

Topic: 5x7950 Gigabyte WF3 Rig using 1475 Watts!!! (Read 6861 times)