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Author Topic: Any advise how to lower Watt usage witout losing hasing capacity  (Read 1206 times)
arandy (OP)
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January 11, 2014, 04:20:50 PM
 #1

I'm running a miner with 4x 7950 cards. Right now it's using about 1230Watts/h and hashing 2,36 Mh/s
Running on the settings you see here below.

If anyone has a similar setup that runs less Watts then please advise me Smiley

"hotplug" : "5",
"kernel-path" : "/usr/local/bin",
"log" : "5",
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"shares" : "0",
"gpu-threads" : "1",
"gpu-dyninterval" : "7",
"gpu-engine" : "1000,1000,1000,1000",
"gpu-fan" : "60-85,60-85,60-85,60-85",
"gpu-platform" : "0",
"gpu-memclock" : "1400,1400,1400,1400",
"gpu-memdiff" : "0",
"gpu-powertune" : "15,15,15,15",
"gpu-vddc" : "1.087",
"intensity" : "19,19,19,19",
"temp-target" : "78",
"temp-overheat" : "83",
"temp-cutoff" : "86",
"temp-hysteresis" : "3",
"vectors" : "1",
"worksize" : "256",
"lookup-gap" : "2",
"shaders" : "0",
"thread-concurrency" : "21712",
"no-pool-disable" : true

Veld   Waarde
Grafische Processor Eigenschappen   
Video kaart   AMD Radeon HD 7950 (Tahiti)
BIOS versie   015.031.000.000.000000
BIOS datum   24-1-2013
GPU Codenaam   Tahiti Pro
Onderdeelnummer   113-C3864000-100
PCI-apparaat   1002-679A / 1787-3000  (Rev 00)
Transistoren   4313 miljoen
Procestechnologie   28 nm
Verpakkingsoppervlak   365 mm2
Bus Type   PCI Express 3.0 x16 @ 2.0 x8
Geheugengrootte   3 GB
GPU Klok   1000 Mhz  (origineel: 930 MHz, overclock: 8%)
RAMDAC kloksnelheid   400 Mhz
Pixel Pipelines   32
Texture Mapping eenheden   112
Gecombineerde shaders   1792  (v5.1)
DirectX hardware ondersteuning   DirectX v11.1
PowerControl   15%
   
Geheugenbus-Eigenschappen   
Bus Type   GDDR5
Bus Breedte   384 bit
Werkelijke kloksnelheid   1400 Mhz (QDR)  (origineel: 1250 MHz, overclock: 12%)
Effectieve kloksnelheid   5600 Mhz
Bandbreedte   262.5 GB/s
   
Architecture   
Architecture   AMD GCN
Compute Units (CU)   28
SIMD Per Compute Unit   4
SIMD Width   16
SIMD Instruction Width   1
L1 Instruction Cache   32 KB per CU-Quad
L1 Vector Data Cache   16 KB per CU
L1 Scalar Data Cache   16 KB per CU-Quad
L2 Cache   768 KB
Local Data Share   64 KB
Global Data Share   64 KB
   
Theoretical Peak Performance   
Pixel vulsnelheid   32000 MPixel/s @ 1000 Mhz
Texel vulsnelheid   112000 MTexel/s @ 1000 Mhz
Single-Precision FLOPS   3584.0 GFLOPS @ 1000 Mhz
Double-Precision FLOPS   896.0 GFLOPS @ 1000 Mhz
24-bit Integer IOPS   3584.0 GIOPS @ 1000 Mhz
32-bit Integer IOPS   716.8 GIOPS @ 1000 Mhz
   
Percentage   
GPU   100%
Dedicated Memory   1406 MB
Dynamic Memory   58 MB
   
ATI PowerPlay (BIOS)   
State #1   GPU: 930 Mhz, Geheugen: 1250 Mhz  (Boot)
State #2   GPU: 930 Mhz, Geheugen: 1250 Mhz
State #3   GPU: 880 Mhz, Geheugen: 1250 Mhz  (UVD)
State #4   GPU: 300 Mhz, Geheugen: 150 Mhz
   
Frabrikant Grafische processor   
Firmanaam   Advanced Micro Devices, Inc.
Productinformatie   http://www.amd.com/us/products/desktop/graphics
Driver download   http://sites.amd.com/us/game/downloads
Driver Update   http://www.aida64.com/driver-updates
crazyates
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January 11, 2014, 05:07:57 PM
 #2

I'm running a miner with 4x 7950 cards. Right now it's using about 1230Watts/h and hashing 2,36 Mh/s
Running on the settings you see here below.

"gpu-vddc" : "1.087",
Undervolting is your friend. However, CGMiner can't actually set the voltage on those 7950 cards. You have to use a third party program like MSI AB, or tweak and flash the BIOS.

Use VBE7 to manually tweak the voltage, and then reflash your modified settings. HERE is a nice guide to follow.

I've got a 3.5Mh/s, 5x 280x rig that was pulling ~1450W, and I dropped the voltage to 1.019, and now it's pulling ~1250W. That's a 200W saving, which works out to 40W per card! Also does wonders for keeping the temps cooler as well.

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arandy (OP)
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January 11, 2014, 07:19:19 PM
 #3

Tnx I wil try this and post the difference when done.
arandy (OP)
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January 12, 2014, 03:05:20 PM
 #4

Just finished up flashing my cards tp 1081Mv the rig went from 1230W to 1040W.
Right now i will tune the cards up again to and then try and lower some more probably.

Great way to spend the sunday afternoon  Wink
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January 12, 2014, 05:44:29 PM
 #5

Just finished up flashing my cards tp 1081Mv the rig went from 1230W to 1040W.
Right now i will tune the cards up again to and then try and lower some more probably.

Great way to spend the sunday afternoon  Wink
Great! Let us know how low you're able to get! Remember to let them mine for a solid ~20 minutes or so on each setting to guarantee stability.

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