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650 Watt PSU for Crossfire 6870's

post #1 of 11
Thread Starter 
Hello,

I am just trying to clear up some confusion. Several people have mentioned I will not be able to crossfire my 6870 with my current PSU. I understand my PSU only has 2-6pin PCI-e connectors, but buying this would solve that issue (so connections shouldn't be a problem).

My question, therefore, is whether it has sufficient power. It has 3 +12v rails (22, 22, 25 amps). According to Antec's own site, I would need a 550 watt PSU to power what I have (OC'd i5 @ 4.8 Ghz and 1.312v + 1 DVDRW Drive + 1 Blu-Ray Burner + high performance PC motherboard + 2 sticks DDR3 RAM + 2x6870's + 1 7200 RPM HDD + 1 SSD drive + 4 120 mm fans and 1 140 mm fan). That leaves me with 100 extra watts...

Also, a person who reviewed my power supply on newegg mentioned he is SLI'ing GTX 560Ti's

Thoughts?
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I Shoot to Maim
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post #2 of 11
I've asked this question many times here on OCN and other forums since I too want to do CF on my 650watt psu. 650 is more than enough.
post #3 of 11
enough
post #4 of 11
Thread Starter 
I appreciate the quick responses. I found another person who SLI'd 9800GTX+'s (use less power, but not massively less).
I Shoot to Maim
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I Shoot to Maim
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post #5 of 11
Should be enough and remember those psu calculators somewhat exaggerate the power.
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post #6 of 11
Yeah, you will be fine.


You'll just have to use the molex adapters to get the required 6 pin PCI-E cards. Granted you could always buy a better PSU, but that costs money and not everyone can just buy whatever whenever.
post #7 of 11
You'll have power to spare.
    
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post #8 of 11
YOu will be fine. Remember the power consumption of todays cards are less than the days of old. You could crossfire two 4870's on that psu.
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post #9 of 11
Quote:
Originally Posted by seabiscuit68;13190383 
Hello,

I am just trying to clear up some confusion. Several people have mentioned I will not be able to crossfire my 6870 with my current PSU. I understand my PSU only has 2-6pin PCI-e connectors, but buying this would solve that issue (so connections shouldn't be a problem).

My question, therefore, is whether it has sufficient power. It has 3 +12v rails (22, 22, 25 amps). According to Antec's own site, I would need a 550 watt PSU to power what I have (OC'd i5 @ 4.8 Ghz and 1.312v + 1 DVDRW Drive + 1 Blu-Ray Burner + high performance PC motherboard + 2 sticks DDR3 RAM + 2x6870's + 1 7200 RPM HDD + 1 SSD drive + 4 120 mm fans and 1 140 mm fan). That leaves me with 100 extra watts...

Also, a person who reviewed my power supply on newegg mentioned he is SLI'ing GTX 560Ti's

Thoughts?

Just a note, although your question has mostly been solved, you can't just sum the 12v rails for your 12v output (22 + 22 + 25 = 69A, the average 850W PSUs output). Anyway, under full load 6870s use like 400Watts, so you'll be more than fine.
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Bleeding Edge
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post #10 of 11
Thread Starter 
Again, thanks for the replies. I was hoping to not have to upgrade the PSU until I build the next rig with....whatever comes next. You all seem to agree that I won't need to.
I Shoot to Maim
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480GB Sandisk Extreme Pro 2TB WD Black 7200RPM Blu-Ray Reader/Burner NZXT Kraken x61 Watercooler 
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Window 10 Dell S2716DGR + Qnix 1440p @ 96Hz + Asus 27" 1080p Logitech G910 Orion Spark Mechanical EVGA GQ 850 watt 
CaseMouseMouse PadAudio
Corsair Carbide 500R Anker 8200DPI SteelSeries QcK Gaming  Logitech Z623 
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I Shoot to Maim
(16 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 6700k @ 4.5Ghz Gigabyte GA-Z170X Gaming 7 EVGA GTX 1080 SC ACX 3.0 Crucial 2x8GB DDR4 3200MHz 
Hard DriveHard DriveOptical DriveCooling
480GB Sandisk Extreme Pro 2TB WD Black 7200RPM Blu-Ray Reader/Burner NZXT Kraken x61 Watercooler 
OSMonitorKeyboardPower
Window 10 Dell S2716DGR + Qnix 1440p @ 96Hz + Asus 27" 1080p Logitech G910 Orion Spark Mechanical EVGA GQ 850 watt 
CaseMouseMouse PadAudio
Corsair Carbide 500R Anker 8200DPI SteelSeries QcK Gaming  Logitech Z623 
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