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sli gtx 470 on corsair tx650w power supply

post #1 of 5
Thread Starter 
I wish to sli some gtx 470 cards using my existing power supply, the tx650w from corsair. The only problem is that it has only 2 pci-e cords from the supply. I was wondering if i could use a splitter to supply the power to the second card as well.
post #2 of 5
Actually, the cards usually come with adapters that use two 4-pin Molex connectors to create one PCI-E connector.
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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 
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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) 
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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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post #3 of 5
Thread Starter 
awesome thanks for the help
post #4 of 5
It's not powerful enough to handle two 470s. That's 430w estimated TDP just for the GPUs. I'd upgrade to the TX750 at least.
     
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post #5 of 5
Quote:
Originally Posted by Imglidinhere View Post
It's not powerful enough to handle two 470s. That's 430w estimated TDP just for the GPUs. I'd upgrade to the TX750 at least.
The TX650 has a +12V wattage capacity of 636W, and the maximum amount of power that a single GTX 470 can pull at stock is approximately 215W. However, 2nd GTX 470 in SLI cannot pull 215W due to scaling - even in the most graphically stressful/demanding conditions. At the most, the two cards together under the highest loads would pull ~350W, maybe 375W - and I am being generous.

So let's go with a combined total of an absolute maximum of 375W between both cards. If this is the maximum possible power draw (and I still believe I'm being generous), then this leaves 261W on the +12V which means that this is what's left for everything that is using the +12V as its power source (most of the system, including the CPU). So this even leaves enough power left over for folding on both the CPU and the two GTX 470s simultaneously.

Let's be even more generous (unrealistic, actually) and say that the maximum power draw is 400W between both cards. This scenario would leave 236W on the TX650's +12V which is still enough power left over.

The Hardware Canucks performed a power consumption test by measuring the power draw at the wall during a very intense 30-minute graphics test. The result was that their entire computer system caused the power supply to draw 541W from the wall outlet. So now if we say that their power supply was 80% efficient during this power draw, then we can say that the entire computer system was pulling 432.8W during this load. While idling for 30 minutes, their system peaked at 220W. Here is their test system:

http://www.hardwarecanucks.com/forum...-review-2.html

Here's the load test:

http://www.hardwarecanucks.com/forum...review-17.html

Here's an image:




Again, this is for the entire system's power draw measured at the wall, and not just the graphics cards. In other words, these figures are what the power supply was pulling from the wall outlet. However, this doesn't mean that 541 is subtracted from the TX650's 650W rating, but instead this is figured out by multiplying these figures by the efficiency as a percentage (e.g. 541 x 0.80 for 80% efficient). So again, 541W at the wall could mean 432.8W if the PSU were 80% efficient during the load. However, even if it were 85% efficient, then that's still only 459.85W.

So I am very confident that the TX650 would have no problem powering an average system that has two GTX 470s in it.

Now, I suppose someone might ask me why I have the HX650 powering my little system with a single GTX 470 in it. The answer is that I originally wanted the HX450, but the cost of international shipping would have made it cost more than what the HX650 was going for at the time.
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... 
  hide details  
Reply
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... 
  hide details  
Reply
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