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Can I run a single Gigabyte WF3 7950 on a single 12v rail?

post #1 of 25
Thread Starter 
Title says it all. I only ask because my PSU is a Coolermaster Silent Pro M 850W and it only has 3 power connectors for GPU's that came with it. But the connectors have one 8 pin and one 6 pin on each cable. I am getting a Sapphire 7950 OC edition cheap from a friend of mine that I plan to crossfire with my Gigabyte WF3 and like I said I only have the 3 cable connectors. I have an splitter from my old PSU that splits a 6 pin into 2x 6 pin that I can put on 1 card and then use the other 2 for the other card. Will this work out alright or do I have to use separate cables?
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Blue Monster
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post #2 of 25
FX6100 isnt good for a HD 7950 Cfx better get a 8120 or 8320, anyway using cables like adapters do the work
Edited by PontiacGTX - 12/1/12 at 12:01pm
  
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post #3 of 25
The 8pin connectors should split up in 6+2pin, so just use two out of the three cables to power the gpu's.
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post #4 of 25
Thread Starter 
Quote:
Originally Posted by Kasp1js View Post

The 8pin connectors should split up in 6+2pin, so just use two out of the three cables to power the gpu's.

Unfortunately that is not the case. All 3 cables have one solid 8 pin connector and a 6+2 like I said. But I have a splitter that takes one 6 pin and turns it into 2 6 pin connectors. I just want to know if this will harm my PSU or anything of the sort.
Blue Monster
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AMD FX 8350 @ 5.0Ghz on 1.5V Asus Sabertooth Rev 2.0 Gigabyte 7950 WF3 1250/1600 OC on 1.3V AIR 8 GB GSkill Ripjaw X 
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Blue Monster
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2 x Seagate Barracuda 1TB  1x Kingston Hyper X 120GB SSD Asus Combo 7x120mm CM and 1x200mm CM 
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post #5 of 25
That's weird, but there should be no problems using the splitter.
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post #6 of 25
Quote:
Originally Posted by twitch_alucard View Post

Unfortunately that is not the case. All 3 cables have one solid 8 pin connector and a 6+2 like I said. But I have a splitter that takes one 6 pin and turns it into 2 6 pin connectors. I just want to know if this will harm my PSU or anything of the sort.

im going to say that will not be enough power for the gpu, if i understand you want to take 1 cable with a 6 pin, and use it with some sort of ghetto adaptar, to make it 2 6 pins meaning its still only giving the power of 1 6 pin.
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post #7 of 25
Thread Starter 
Quote:
Originally Posted by ShortySmalls View Post

im going to say that will not be enough power for the gpu, if i understand you want to take 1 cable with a 6 pin, and use it with some sort of ghetto adaptar, to make it 2 6 pins meaning its still only giving the power of 1 6 pin.

The cable Im splitting runs off a 12V rail and has 1x 8 pin solid and 1 x 6+2 pin. I would take the 6+2 pin and split it into 2x 6 pins with a non ghetto adapter. My coolermaster silent pro M 850W only came with 3 cables and they are all 6+2pin / 8pin per cable
Blue Monster
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Blue Monster
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AMD FX 8350 @ 5.0Ghz on 1.5V Asus Sabertooth Rev 2.0 Gigabyte 7950 WF3 1250/1600 OC on 1.3V AIR 8 GB GSkill Ripjaw X 
Hard DriveHard DriveOptical DriveCooling
2 x Seagate Barracuda 1TB  1x Kingston Hyper X 120GB SSD Asus Combo 7x120mm CM and 1x200mm CM 
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post #8 of 25

With the power capacity of your PSU, there should be plenty of power to do this.

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It's a computer!
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i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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post #9 of 25
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

With the power capacity of your PSU, there should be plenty of power to do this.

But will it be ok to do this off the cable in the way that I want. This seems to be the only way concidering both 7950's have 2x 6 pin.
Blue Monster
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CPUMotherboardGraphicsRAM
AMD FX 8350 @ 5.0Ghz on 1.5V Asus Sabertooth Rev 2.0 Gigabyte 7950 WF3 1250/1600 OC on 1.3V AIR 8 GB GSkill Ripjaw X 
Hard DriveHard DriveOptical DriveCooling
2 x Seagate Barracuda 1TB  1x Kingston Hyper X 120GB SSD Asus Combo 7x120mm CM and 1x200mm CM 
CoolingOSMonitorPower
Raystorm RS240 Windows 7 Ultimate 64 Bit Asus 21.5" 1080P full HD 850W Coolermaster M Silent Pro 
Case
Coolermaster HAF 912 
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Blue Monster
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CPUMotherboardGraphicsRAM
AMD FX 8350 @ 5.0Ghz on 1.5V Asus Sabertooth Rev 2.0 Gigabyte 7950 WF3 1250/1600 OC on 1.3V AIR 8 GB GSkill Ripjaw X 
Hard DriveHard DriveOptical DriveCooling
2 x Seagate Barracuda 1TB  1x Kingston Hyper X 120GB SSD Asus Combo 7x120mm CM and 1x200mm CM 
CoolingOSMonitorPower
Raystorm RS240 Windows 7 Ultimate 64 Bit Asus 21.5" 1080P full HD 850W Coolermaster M Silent Pro 
Case
Coolermaster HAF 912 
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Reply
post #10 of 25
Quote:
Originally Posted by twitch_alucard View Post


But will it be ok to do this off the cable in the way that I want. This seems to be the only way concidering both 7950's have 2x 6 pin.

 

I'm not enough of a PSU expert to really know, but I have to assume that with as much headroom as you will have even with two 7950s in Crossfire, this should be fine.

 

However, this thread would be better off in the Power Supplies forum.  Can you report your original post and make a brief request to have it moved?  I could do that, but it's nicer when the report comes from the Thread Starter.  :)

It's a computer!
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Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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