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Several PSU questions

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November 26, 2012 4:50:34 AM

Hi,

I just purchased a gtx 660, and was thinking of overclocking my stock i5-750 to go along with it. While reading about OCing, I discovered I have a horrible 700 watt Xtremegear psu (apparently it's more like a cheap 500 watt). Now, I have run my pc 24/7 for about 4 years now and haven't had a problem. However, with my new gpu, i dont want to risk this cheap psu blowing and killing it and/or my cpu.

On the advice of another forum member I ordered a http://www.newegg.com/Product/Product.aspx?Item=N82E168... and would have gotten better, but I'm broke at the moment.. I have a few questions. I noticed the reviews on this corsair psu are very hit or miss, should i stick with my cheap old faithful psu, or switch it out now? If the corsair has problems, is there less chance of it causing damage because it's higher quality? Will this 430 watt psu be enough for my new gtx non ti 660? Could i OC my i5-750 to 3.6 with the corsair? How much wattage headroom should there be? My setup is 2 sticks of ddr3, i5-750, 2 case fans, a cheap aftermarket cpu cooler, 4-5 usb devices, and a 1 tb 720 hdd.

I appreciate any device. I rarely upgrade my hardware, and am now broke, so I'm nervous about the whole thing.

More about : psu questions

a b ) Power supply
November 26, 2012 7:55:25 AM

I would rather stay with your old xtremegear PSU until you can buy something better. It should deliver more power than your new Corsair.

OCed i5-750 draws a lot of power, I would estimate about 220-240W, add GPU load to that, about 100-110W and the rest of the components, and you are close to 400W. This means running the Corsair at almost full load. It's not recommended. Your old PSU should have enough reserves to power your config, but I'd recommend replacing it as soon as you saved some money. Return your new Corsair and then buy something decent with about 600W of power and it will last for years.

Generally speaking when PSU outputs more power than it's specified to, it should simply turn off without causing any damage to the PC. This protection can work many times, but it may once happen that when PSU is overloaded one of it's components fails causing some current spikes which damage your PC. This is more likely to happen with cheap product like your Xtremegear, rather then in higher quality PSU, which the Corsair is.
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a c 122 ) Power supply
November 26, 2012 8:47:49 AM

Here is Guru3Ds power supply recommendation:

GeForce GTX 660 - On your average system the card requires you to have a 450~500 Watt power supply unit.
GeForce GTX 660 SLI - On your average system the cards require you to have a 700 Watt power supply unit as minimum.

If you are going to overclock GPU or processor, then we do recommend you purchase something with some more stamina.Source: http://www.guru3d.com/articles_pages/asus_geforce_gtx_6... Whatever member here gave you the advice is a noob and should be shot!!
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a c 122 ) Power supply
November 26, 2012 9:02:04 AM

Anyways as far as brand goes no that is not how you pick a power supply imo anyway.As much as the power (Watts) requirement matters, the current requirement, measured in Amps is as important if not even more important. This is especially true if you have an or several dedicated video card(s). As a general rule of thumb, you are aiming for the highest number on the 12V line.If you don't want to learn about it then use these links as guides: http://www.johnnylucky.org/power-supplies/psu-lemon-lis...
http://www.eggxpert.com/forums/permalink/323050/323050/...
http://www.tomshardware.com/forum/322966-28-list-recomm...
http://www.tomshardware.com/forum/324368-28-computer-po...
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November 26, 2012 9:03:32 AM

Thanks for the info! Based on both of your replies I will return the PSU I ordered, and hopefully replace it with a better one in a month or so. I thought 430 watts seemed a little low... I wasn't aware my previous PSU was so horrible, and given its age, I want to replace it asap, especially with my new GPU. Hopefully it lasts 1-2 more months.
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a c 122 ) Power supply
November 26, 2012 9:06:04 AM

Your welcome!Sorry you received advice from a noob!
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November 26, 2012 9:19:13 AM

Best answer selected by quothe.
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