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Power Supplies- need info on how much watts to get

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August 19, 2009 9:30:11 AM

Hi guys im about to build a computer to replace my old computer and was wondering how much watts would i need to power up my system. i know that im gonna go with the Corsair TX series PSU, here are my spec on the system

-Intel core 2 duo extreme x6800 2.93gz (MIGHT OC)
-Gigabyte ep445-ud3p
-4gb or 8gb ddr2 1066
-Radeon HD 4870 (MIGHT run crossfire with another 4870)
-1x seagate 7200.12 1tb
-1x WD black 1tb
-1x 22x dvd burner
-1x blu ray drive
-1x samsung 22" monitor

i was looking at the Corsair 650tx or 750tx PSU will that be enough or should i get more watts?
a b ) Power supply
August 19, 2009 9:33:43 AM

You need the 750W Corsair psu for Crossfire. It has 4 x 8 pin.
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August 19, 2009 9:35:58 AM

so 750s will be enough to power the whole system right? should i get the 850w to some some breathing room?

thanks hefox for the reply
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a b ) Power supply
August 19, 2009 9:44:00 AM

750 W is enough but if you don't have any problem spending some money then go for 850W.
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a b ) Power supply
August 19, 2009 9:52:44 AM

750TX willl be more than enough.
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August 19, 2009 11:54:04 AM

650 is even enough, But the price difference often lies between 20 euroes (here in europe) Wich makes a lot of ppl go for the 750 rather then the 650.

But then again for 10 more you'd be having a 850 .. Like i did
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a b ) Power supply
August 19, 2009 11:59:07 AM

ill b ben said:
650 is even enough, But the price difference often lies between 20 euroes (here in europe) Wich makes a lot of ppl go for the 750 rather then the 650.

But then again for 10 more you'd be having a 850 .. Like i did

650 has only 2 x 8pin.
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a c 248 ) Power supply
August 19, 2009 12:55:37 PM

The general rule of thumb is a high quality 500 - 550 watt power supply can easily power any single video card made and depending on the video card sometimes two video cards operating in dual mode. A high quality 750 watt power supply can easily power two video cards operating in dual mode.

Your list shows two 4870 cards operating in Crossfire mode. Two 4870 video cards operating in Crossfire mode use a combined total of about 295 watts and 25 amps at full load. The two video cards use a lot more power than the rest of your components combined. The source of the information is an article about video power consumption published last January right here at Tom's hardware.

The Corsair 550 watt power supply is an excellent power supply that can easily power your components. It has a single large 12 volt rail rated at 41 amps. You'll be in the range for peak efficiency.
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a c 144 ) Power supply
August 19, 2009 4:01:06 PM

But you will need PCI-e adapters if you are going to run two 4870's. A Corsair 550 has enough power. A Corsair 650 has plenty of power. But the first PSU that has four "6+2" PCI-e power cables is the TX750.
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a c 248 ) Power supply
August 19, 2009 4:16:59 PM

A lot of the video cards include adapter cables. If not, they are readily available for a few dollars from online vendors.
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