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How much Wattage

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October 9, 2012 8:17:25 AM

ok so first of all heres my build

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3450 3.1GHz Quad-Core Processor ($192.97 @ CompUSA)
Motherboard: ASRock H77 Pro4-M Micro ATX LGA1155 Motherboard ($97.55 @ Newegg)
Memory: Patriot Intel Extreme Master, Limited Ed 8GB (2 x 4GB) DDR3-1600 Memory ($40.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($85.88 @ NCIX US)
Video Card: Sapphire Radeon HD 7950 3GB Video Card ($289.99 @ Newegg)
Case: Rosewill Challenger-U3 ATX Mid Tower Case ($59.99 @ Newegg)
Optical Drive: Lite-On IHBS112-04 Blu-Ray/DVD/CD Writer ($72.98 @ Newegg)
Total: $840.35
(Prices include shipping, taxes, and discounts when available.)

obviously you can see see that there is no power supply.

here is the supply power i got originally:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

now the problem i have is that the power supply wasnt enough. So it seems that i have been falsely told that 550w was enough to power my computer. so i added as much of everything as i could and it seems that i need a 750w-800w PSU. So i was wondering if i should get 750w or 800w, or does it not really matter which??

heres 2 PSU's i found

http://pcpartpicker.com/part/corsair-power-supply-cmpsu...

http://pcpartpicker.com/part/corsair-power-supply-cx750


and i dont want anything more expensive than $110

More about : wattage

October 9, 2012 8:28:42 AM

550W should be enough barely. 750 - 850W is too much, unless you plan to Xfire in the near future.

However I would still recommend a CX750, as you do not want your PSU running at 100% all the time, and it also gives you room to upgrade to Xfire/ a new GPU later on.

I think the Cx750 would suit your needs.

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October 9, 2012 8:32:06 AM

ok so 750 wont make it over heat or anything like that?
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Anonymous
a b ) Power supply
October 9, 2012 8:34:35 AM

when you say "so i added as much of everything as i could and it seems that i need a 750w-800w PSU. " leads me to believe you used an online calculator. those do not take in the quality of any particular PSU (meaning how much power is on the 12 volt rail, PCI power connection, ect) but just gives a general recommendation.

it is better to look at a power consumption benchmark from a review:


a good 650 watt PSU will cover that (507/.8=633 watt to keep it under 80% load when overclocked)

edit: and keep in mind that that system in the benchmark was a sandy-E set up which will use ~45 more watts.

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October 9, 2012 8:37:07 AM

How do you figure out the XFX PSU is not enough? It's more than enough your system will pull less than 400W so a 550W is actualy ideal it sits in the most efficient middle 3rd bracket for a PSU to be used at.

If you want more though pick a wattage out of the air (as your system needs less than 400) and choose a PSU that is the wattage you want from a quality maker - xfx, corsair, seasonic, ocz, antec
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October 9, 2012 8:46:08 AM

Anonymous said:
edit: and keep in mind that that system in the benchmark was a sandy-E set up which will use ~45 more watts.


I'd bet alot more than that his Ivy will pull 77W thats SB-E clocked to 4.6GHz I bet is pulling near to 200
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a b ) Power supply
October 9, 2012 8:50:21 AM

I agree the XFX is great for your system.
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October 9, 2012 8:52:08 AM

Well like the reason i dont think its enough is cause when i built it i kept testing the computer as i put parts in to make sure every part was working fine. but one i put in the final part (graphics card). It wouldnt stay on. Thats why im not sure
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October 9, 2012 9:00:44 AM

I'd be inclined to say the issue is with your Graphics Card as even at full load that PSU should suffice.
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October 9, 2012 9:03:44 AM

well honestly im not entirely sure cause like it was working perfectly fine but when we changed rooms and plugged it in it wouldnt come on. so could it possibly be that something wasnt quite plugged in all the way, because of the travel?
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Anonymous
a b ) Power supply
October 9, 2012 3:35:54 PM

mikeandike128 said:
well honestly im not entirely sure cause like it was working perfectly fine but when we changed rooms and plugged it in it wouldnt come on. so could it possibly be that something wasnt quite plugged in all the way, because of the travel?

ah.

the chart i posted shows that even in a sandy-E set up (again uses more power) that the load of an overclocked 7950 would be 92% of what that XFX can handle. not desirable but doable.

if it went flonky after moving, then it might be wise to not assume its the PSU and start a through trouble shooting process.

did you make sure the wall outlet you plugged into works? we are talking about a dorm room?
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October 9, 2012 9:34:04 PM

no it was like from one side of the room to the other, which was like 5 feet. but it traveled from one side of the house to the other just before and it plugged in and worked fine. but today im gonna re put in the PSU and just check everything
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