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PSU for crossfire 7950

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Power supply Master

For a system using two Radeon HD 7950 graphics cards in 2-way CrossFireX mode AMD specifies a minimum of an 700 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 45 Amps or greater and have at least four 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most important factor.

Overclocking of the CPU and/or GPU(s) will require an additional increase to the combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock you are trying to achieve.

The Corsair Enthusiast Series TX650 V2 (CP-9020038-NA), with its combined +12 Volt continuous current rating of 54 Amps and with two (6+2)-pin PCI Express supplementary power connectors, is electrically sufficient to power your system configuration with two Radeon HD 7950 in 2-way CrossFire mode. *** It is deficient by two PCI Express supplementary power connectors. ***

The Corsair Builder Series CX750 (CP-9020015-WW), with its combined +12 Volt continuous current rating of 62 Amps and with four (6+2)-pin PCI Express supplementary power connectors, is way more than sufficient to power your system configuration with two Radeon HD 7950 in 2-way CrossFire mode.
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Power supply Master

driedupfish said:
So maybe I should get the CX750 then, but I've heard the CX series is not as good as the TX series. Is that true?

The CX Series are geared toward the basic budget builds. Uses cheaper Japanese and Chinese made capacitors rated at 80°C. Has a 3 Year Warranty.

The TX Series is geared toward the enthusiast mainstream builds. Uses Japanese capacitors rated at 105°C. Has a 5 Year Warranty.

Yes, the TX Series is suppose to be of a higher quality than the CX.

ko888 said:
The CX Series are geared toward the basic budget builds. Uses cheaper Japanese and Chinese made capacitors rated at 80°C. Has a 3 Year Warranty.

The TX Series is geared toward the enthusiast mainstream builds. Uses Japanese capacitors rated at 105°C. Has a 5 Year Warranty.

Yes, the TX Series is suppose to be of a higher quality than the CX.


If that's the case, should I just get the TX650?
Here is my build:
PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($169.99 @ Microcenter)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ Amazon)
Motherboard: Gigabyte GA-Z77X-UD3H ATX LGA1155 Motherboard ($144.99 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($38.99 @ NCIX US)
Storage: Samsung Spinpoint F3 1TB 3.5" 7200RPM Internal Hard Drive ($88.98 @ Newegg)
Storage: Crucial M4 128GB 2.5" Solid State Disk ($99.99 @ B&H)
Video Card: Sapphire Radeon HD 7950 3GB Video Card ($279.99 @ Newegg)
Case: Cooler Master HAF 912 ATX Mid Tower Case ($49.99 @ NCIX US)
Power Supply: Corsair Builder 750W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($74.99 @ Newegg)
Optical Drive: Samsung SN-208BB DVD/CD Writer ($25.02 @ SuperBiiz)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($99.99 @ Newegg)
Total: $1087.90
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-12-31 21:29 EST-0500)

650w should be enough right? However, eventually I may want to crossfire 7950

Both the cx750 and TX650 is about the same price. Or would you recommend a better PSU at this price range.
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