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How much power will I need?

post #1 of 5
Thread Starter 
Okay I'm going to build a new pc. I have the components pretty much picked out and want to know how beefy a power supply I will need. I'm thinking 850W will do it and I don't want to buy like a 1000W if I only need 850, ya know?

Case: NZXT Phantom
Processor: AMD X6 1100T
Mobo: MSI 890FXA-GD70
GPU: 2 x MSI R6950 Twin Frozr III Radeon HD 6950 2GB in Crossfire config
Memory: G.Skill Flare series 4GB (2x2GB) DDR3 1800

Then a Plextor CD/DVD drive and lets say 1 10,000 RPM 500GB to 1TB hard drive.

So will 850W be enough? I'm looking at the OCZ ZX Series 80+ Gold 850W PSU since its got good reviews and is on sale for 140.00. I only want to spend like $100 to $150 on the PSU (at least at 850W) so if there's a better one I should be looking at please let me know.

Also is the memory compatible with my CPU and Mobo? It says its the ultimate solution for AMD Phenom II X6's, but that may be marketing BS.

Thanks dudes.
post #2 of 5
850W is over kill for your setup - you could probably get away with a good 650w - 700w. I would go with a Corsair / Antec / Silverstone / Seasonic. Take a look at something such as the Corsair Gaming Series 700 Watt, it would work perfectly for your config. Your memory should be fine for your system.
The Laptop
(6 items)
 
  
CPUGraphicsRAMHard Drive
Intel i7 2860QM AMD Radeon HD 6770M Corsair Vengence 1600MHz Samsung 840 Pro 256GB 
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The Laptop
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CPUGraphicsRAMHard Drive
Intel i7 2860QM AMD Radeon HD 6770M Corsair Vengence 1600MHz Samsung 840 Pro 256GB 
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Mac OS X 10.8 1680 x 1050 anti-glare high resolution  
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post #3 of 5
850w is enough for your setup

as to which 850w, if you're only willing to pay $150 tops, then the ocz one is probably the best choice. this is also a proven performer, but it's not modular, so if you don't mind the mess, go for it.
post #4 of 5
850w is more than enough but theres a site where you can calculate how many watts your pc needs. Link :http://extreme.outervision.com/psucalculatorlite.jsp
Humming Box
(13 items)
 
  
CPUMotherboardGraphicsRAM
I5 760 EVGA P55 Classified 200 MSI Twinfrozer GTX 980 12gb DDR3 GskillRipjaws 
Hard DriveOptical DriveOSMonitor
Samsung 840 120gb +500x3 HDD 1 LG Super Multi windows 7 64 Ultimate LG W2361V 
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Humming Box
(13 items)
 
  
CPUMotherboardGraphicsRAM
I5 760 EVGA P55 Classified 200 MSI Twinfrozer GTX 980 12gb DDR3 GskillRipjaws 
Hard DriveOptical DriveOSMonitor
Samsung 840 120gb +500x3 HDD 1 LG Super Multi windows 7 64 Ultimate LG W2361V 
PowerCaseMouse
Corsair RC 850W Cooler Master ATCS 840 with window X7 
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post #5 of 5
Yea a quality 650watt psu will easily power that. Heck I have a 5970 running on a x650 psu similar components, water cooled, and that uses more power then 2 6950's .
Edited by Wabbits - 6/2/11 at 4:50am
Dawww
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Dawww
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Hard DriveHard DriveOptical DriveCooling
Crucial M4 Crucial C300 Plextor Dvd writer NH-D14 
OSMonitorKeyboardPower
Win 7 Pro Dell U2711 Daskeyboard Model S Professional Silent KINGWIN Lazer Platinum 550w 
CaseMouse
Corsair 650D G500 
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