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Sapphire HD 6970 Crossfire question - Page 3

post #21 of 25
I'm another one here who has experience in this setting (check sig rig) and 750w will be fine unless the Antec unit sucks. I'm running a corsair 750w PSU on 2x6950 unlocked and overclocked (950/1375) with a 2600k @ 4.3ghz, also powering sound card, 4 hdd, 1 ssd, 6 fans including 3x220mm and 3x120mmx38mm Panaflo mediums (very high power consumption fans) and a water pump. Also, I've measured power usage at the outlet during 3dmark11 runs and have seen the power usage staying under 550w at the outlet. Furmark/Kombuster will likely be higher than that, but they're not really great benchmarking tools, mostly tools to see how much power you can consume (they also don't reflect gaming stability for overclocks).

It can be done, easily, if your power supply is of modest quality.
post #22 of 25
Quote:
Originally Posted by Ken1649;15432134 
I think he is overclocking CPU & GPUs with extreme cooling LN2.

He invented/designed/built waterblock so I don't think he could be wrong though wink.gif

http://www.overclock.net/15430496-post6.html

Still, he was only pulling 600w from the psu it self (80% of 760w=608w) it's either something wrong with that specific PSU or something else.
post #23 of 25
Quote:
Originally Posted by Eggy88;15433727 
Still, he was only pulling 600w from the psu it self (80% of 760w=608w) it's either something wrong with that specific PSU or something else.

I meant this
> rolleyes.gif

Maybe I should rephrase lol
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ケンジ
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CPUCPUMotherboardGraphics
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GraphicsRAMRAMHard Drive
2x 6990 + 580 16GB 2133 MHz 24GB 2000 MHz 120GB x 2 RAID0 
Hard DriveHard DriveCoolingCooling
120GB x 4 RAID0 Raptor 300GB x 2 RAID0 CPU-370 CPU-370 
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post #24 of 25
Quote:
Originally Posted by Dr.GumbyM.D.;15432397 
I'm another one here who has experience in this setting (check sig rig) and 750w will be fine unless the Antec unit sucks. I'm running a corsair 750w PSU on 2x6950 unlocked and overclocked (950/1375) with a 2600k @ 4.3ghz, also powering sound card, 4 hdd, 1 ssd, 6 fans including 3x220mm and 3x120mmx38mm Panaflo mediums (very high power consumption fans) and a water pump. Also, I've measured power usage at the outlet during 3dmark11 runs and have seen the power usage staying under 550w at the outlet. Furmark/Kombuster will likely be higher than that, but they're not really great benchmarking tools, mostly tools to see how much power you can consume (they also don't reflect gaming stability for overclocks).

It can be done, easily, if your power supply is of modest quality.

Unlocked 6950s are 250w max cards, that's 500w, plus 150w or more for the cpu and another 100 to run your cooling. 6970s are 300w max cards... if you do the math he'll be pushing it close and on top of that, the TP750 is hardly what I'd call robust.
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post #25 of 25
How come no one mentioned the i7-860 @ stock bottlenecking the 6970's?
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[256GB Samsung 840 Pro] [2x 3TB Green WD30EZRX JBOD] [Corsair H100i] [Windows 7 Pro 64-bit] 
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[23.6" Asus VE247H] [Razer BlackWidow] [Corsair HX850] [Corsair Carbide 500R White] 
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Hard DriveHard DriveCoolingOS
[256GB Samsung 840 Pro] [2x 3TB Green WD30EZRX JBOD] [Corsair H100i] [Windows 7 Pro 64-bit] 
MonitorKeyboardPowerCase
[23.6" Asus VE247H] [Razer BlackWidow] [Corsair HX850] [Corsair Carbide 500R White] 
MouseMouse PadAudioAudio
[Logitech G400] [SteelSeries QcK+] [SteelSeries Siberia V2 Headset] [Zalman ZM-MIC 1 Microphone] 
AudioAudioOtherOther
[Logitech X-540 5.1 Speaker] [Logitech S220 2.1 Speaker] [Bitfenix Recon Fan Controller] [TRENDnet TEW-684UB] 
CPUGraphicsRAMHard Drive
[AMD A6-3400M 2.35GHz @ 1.0875V] [AMD HD 6650M] [2x4GB Corsair Vengence 1333MHz 9-8-8-8 @ 1.5V] [500GB Seagate 5400rpm] 
Optical DriveOSMonitorMouse
[DVD Slimdrive] [Windows 8 Pro 64-bit] [15.6" LED backlight LCD] [Logitech M305] 
Audio
[Nokia Mini-Speakers MD-8] 
CPUMotherboardGraphicsRAM
[Athlon II X2 215 3.4GHz @ 1.4V] [Gigabyte GA-78LMT-S2P (rev3.1)] [XFX 8600GT XXX 256MB GDDR3] [2x2GB G.skill Ripjaws-X 1333 7-7-7-20 @ 1.5V] 
Hard DriveOptical DriveCoolingOS
[500GB WD Blue] [LG 24X DVD-Writer] [Hyper TX3] [Windows 7 64-bit] 
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