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From AMD site the required powersupply for 7950 is 500W.

http://www.amd.com/us/products/desktop/graphics/7000/7950/Pages/radeon-7950.aspx#2

whereas when using custom configurator in ibuypower.com

http://www.ibuypower.com/Store/Intel_Z68_Core_i3_i5_i7_Configurator

it is saying the 7950 requires 750W powersupply.

I currently have AMD HD 6850 on 700W powersupply. I am planning to buy 7950, so I was wondering if 700W is sufficient? or do I need 750W?

I have Intel® Core™ i5-2500 Processor (4x 3.30GHz/6MB L3 Cache) with 4GB RAM ( which I purchased from ibuypower.com some time ago )

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Your power requirement isn't determined by just the video card, but the video card + all other components. If you have a 7950 + 10 hard drives you'll need a larger PSU than a 7950 + 1 SSD. But probably a 700W PSU is sufficient for a single CPU, single GPU setup. –  Ben Voigt Apr 25 '12 at 3:36
    
@BenVoigt I have single 500 GB HARD DRIVE -- 16M Cache, 7200 RPM, 6.0Gb/s. So, I think 700W PSU is sufficient. Thank you for your response. –  user122530 Apr 25 '12 at 3:43

2 Answers 2

According to this power calculator, the difference between the two graphics cards is about 30 W, so I'd guess you'll be fine. I did a rough calculation based on what you supplied and it recommended 312 W.

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With basic components attached (power for mobo, 4 sticks of ram, 1 HDD, 1 optical drive and this new vid card) you are fine at 700w. Even with a few case fans and USB devices you are good.

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