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Two 7950's on my 620w Seasonic?

post #1 of 14
Thread Starter 
So I just ordered my second 7950, a Sapphire Dual-x to crossfire with my MSI TFIII 7950 and it just dawned on me that I only have a 620w Seasonic PSU at the moment:cryingsmi I am also running an i5 3570k @ 4.2Ghz @ 1.248v, 3 Kingston HyperX SSD's, six fans, and one dvd-r drive. Also, the PSU only has two 6 pin connectors so I connected two 6 pin adapters with two molex connectors on each one just to make sure I had enough cables and I do. Will I be able to pull this off until I order my x850 Seasonic or am I going to have to wait?? If I don't overclock the cards would it be possible? I dont want to wait..... haha. Me sO StoOpId!

Here is the power supply I have now:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151095

and here is the power supply I am going to HOPEFULLY order tomorrow:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151102
post #2 of 14
Thread Starter 
According to the eXtreme Power Supply Calculator with all of my exact specs including my overclocked CPU it says the total reccomended wattage is 502w with AGEIA PhysX PPU enabled. Does this mean I'm safe until I get a new power supply in next week?
post #3 of 14
Thread Starter 
and with 100% CPU Utilization and 100% peak system load my total reccomended wattage is 564w. Minimum wattage is 514w. I'm probably getting the card tomorrow so I just want to know if it would be safe to plug it in with no overclock on both cards
Edited by RavageTheEarth - 2/25/13 at 6:57pm
post #4 of 14
Absolutely ! The Platinum 660 would also be a great choice if you have your heart set on more headroom. thumb.gif
Double Vision
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Double Vision
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Crucial M4 SSD Samsung Sony 24X Tfc Monsta 420 and Tfc Xchanger 360 
CoolingCoolingCoolingCooling
Rp 452 res with 2 x D5 varios and DD Cp pro for... Arqtic dual TEC chiller with 2-400watt Qmax tec... Ek supreme Cpu block with modified plate and 2 ... 9 x CM 120 mm R4 fans-1 x 140 Bitfenix Pro fan ... 
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post #5 of 14
Thread Starter 
Yea I think I might just go with the x850 so I have lotsss of headroom because who knows what I am going to do in the future. When I built this rig a month ago I was DEFINETLY not going to crossfire, but......well, I'm sure you know how it is. So since I have an extra 56w of headroom right now would it be safe to slide the power limit over to 20%? Because I have boost cards and I don't want the clocks to fluctuate.
post #6 of 14
Message Original Sin
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post #7 of 14
Thread Starter 
Quote:
Originally Posted by itzhoovEr View Post

Message Original Sin

I'm sorry, what?
post #8 of 14
It should work fine. What I would do it revert your CPU to stock, put the second card in, then slowly overclock/test to make sure it's not hitting the power ceiling.
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post #9 of 14
Don't overvolt the 7950s at all
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Hard DriveHard DriveHard DriveHard Drive
256gb M4 SSD boot 4TB Seagate - Raid 0 4TB Seagate - Raid 0 2TB Western Digital Green for storage 
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Xarmor mechanical cherry mx-brown Hale90 1000w 80+gold EVGA DG-87 Logitech G502 
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256gb samsung SSD Asus Blu-ray Drive Model BC-12B1ST/BLK/B/AS Corsair H50 push/pull Windows 7 Professional 
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post #10 of 14
Quote:
Originally Posted by RavageTheEarth View Post

I'm sorry, what?

http://www.overclock.net/u/243631/original-sin our PSU Editor.
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Western Digital Caviar Black 640GB Cooler Master Hyper 212+ Windows 7 64-bit LG W2353V-PF Black 23" 2ms(GTG) 
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i5 2500k Gigabyte Z68XP-UD3P SAPPHIRE Radeon HD 6950 2GB (OC Edition) Corsair Vengenace 8GB (2x4GB) DDR3 1600 
Hard DriveCoolingOSMonitor
Western Digital Caviar Black 640GB Cooler Master Hyper 212+ Windows 7 64-bit LG W2353V-PF Black 23" 2ms(GTG) 
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Cooler Master QuickFire Pro (MX Brown) Rosewill HIVE-550W Cooler Master 690 Logitech MX518 
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