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Corsair 450W Enough Power for My System?

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February 10, 2010 6:32:13 PM

Hey everybody,
I am building a new system with an i5 750, Sapphire HD 5850 and all the other lower power peripherals. According to this site < http://extreme.outervision.com/PSUEngine > I should have a minimum PSU wattage of 312W. That seems a little low, but Sapphire recommends a 500W PSU at least. I want to get a quality power supply with only one 12v rail, and Corsair fits the bill. Will this Corsair CMPSU-450 < http://www.newegg.com/Product/Product.aspx?Item=N82E168... > be enough to fully power my system? Overclocking would be very fun, but is not completely necessary.

Thanks!
February 10, 2010 6:44:04 PM

I would get at least a 550W...
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February 10, 2010 7:02:19 PM

Stick to 750W, so you don't need to trash ur old one when you build a new system.
February 10, 2010 7:06:36 PM

750W is way overkill. And if you get a quality unit, it will carry over to the next build regardless.

If you're worried about the cost, check out OCZ, Antec Earthwatts, FSP, Silverstone or SeaSonic. All of these are good quality units, and some will be significantly less than Corsair.
February 10, 2010 7:34:14 PM

you can get an 850W PSu for 100$ of newegg now. So 750 watt isnt that big a overkill price wise.
February 10, 2010 7:39:07 PM

Price is certainly not everything. You can't get a QUALITY 850W PSU for $100. A quality PSU is the key to a stable system. A high wattage rating means nothing when your POS PSU blows up and takes your system with it.

Anyway, back to the OP's question. The Corsair 450W PSU would power the system, but you shouldn't be cutting it that close. I agree that a quality 550W PSU would be an excellent choice for this build. Here's a very nice one that's 80+ Bronze certified and a very high quality PSU.

Antec TruePower New TP-550 550W 80 PLUS BRONZE Certified Active PFC Power Supply $89.99 - $20 MIR

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February 10, 2010 7:48:31 PM
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llarson2012 said:
Hey everybody,
I am building a new system with an i5 750, Sapphire HD 5850 and all the other lower power peripherals. According to this site < http://extreme.outervision.com/PSUEngine > I should have a minimum PSU wattage of 312W. That seems a little low, but Sapphire recommends a 500W PSU at least. I want to get a quality power supply with only one 12v rail, and Corsair fits the bill. Will this Corsair CMPSU-450 < http://www.newegg.com/Product/Product.aspx?Item=N82E168... > be enough to fully power my system? Overclocking would be very fun, but is not completely necessary.

Thanks!


Hi llarson2012,

The Corsair 450w can run your system just fine.

As I assume MadAdmiral (Edit: and shortstuff)were alluding to--you would get better energy efficiency and have more room for for a future crossfire upgrade/extreme overclocking with the with the Corsair 550w power supply, but that's all the difference would be.

Sapphire recommended the 500w because they assume you will buy a crap-quality PSU to run your system. That Corsair you have is a beast-- and can handle as much amperage as most 550w or 600w PSUs. A higher quality PSU is always a better choice than a crap quality 850w one.

If you need proof check out Corsair's power supply calculator--which is quite conservative and suggests the 450vx: http://www.corsair.com/default.aspx
February 10, 2010 7:53:02 PM

@deadlockedworld: Yes I was. It also has some more room for overclocking and expanding.

@builder: That first one is a good deal, but NOT a 850W for under $100. That second one is of questionable quality.
February 10, 2010 9:04:45 PM

thank you everybody. i think that ill play it safe and spend a little extra for the 550w to make sure i have stability and can overclock.
February 10, 2010 9:05:01 PM

Best answer selected by llarson2012.
February 11, 2010 5:52:16 PM

llarson2012 said:
Hey everybody,
I am building a new system with an i5 750, Sapphire HD 5850 and all the other lower power peripherals. According to this site < http://extreme.outervision.com/PSUEngine > I should have a minimum PSU wattage of 312W. That seems a little low, but Sapphire recommends a 500W PSU at least. I want to get a quality power supply with only one 12v rail, and Corsair fits the bill. Will this Corsair CMPSU-450 < http://www.newegg.com/Product/Product.aspx?Item=N82E168... > be enough to fully power my system? Overclocking would be very fun, but is not completely necessary.

Thanks!

Since you're asking for opinions, here's mine. If you need to ask if the power PSU is big enough, it isn't. The PSU is the last thing you should consider marginalizing. You should buy the biggest quality PSU you can afford and never have to worry about over taxing it. Running any power supply at or near it's limits is stupid and unnecessary. They aren't that expensive and are the cheapest insurance policy you will ever buy for your computer. Unfortunately, if you're like most builders you'll completely ignore me.
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