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How much Power do I need

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June 17, 2009 2:16:53 PM

I am not sure how large of a power supply to buy for the following build:

Intel Core i7 920 Nehalem 2.66GHz Processor
ASUS P6T Deluxe V2 Intel X58 MoBo
EVGA GeForce 9500 GT 1GB Video Card
G.SKILL 6GB (3 x 2GB) 240-Pin DDR3 SDRAM 1333 (PC3 10666)
2x Western Digital VelociRaptor 300GB 10000 RPM Internal Hard Drive
LG Internal Blu-ray/HD DVD-ROM & 16X DVD±R DVD Burner
Thermalright Ultra 120 eXtreme - 1366 RT CPU Heatsink+Fan
3 Case Fans
And all the other little stuff...

I plan on overclocking it, and have read that to overclock the i7 to around 4GHz uses approx 400W, but I have no idea how much extra power I need, because I don't want to run a power supply over 90%/95% and have it burn out on me either.

More about : power

a b ) Power supply
June 17, 2009 4:47:00 PM

I would go for a corsair or pc power and cooling 750w. Newegg had some models for under $100 after rebate.
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a b ) Power supply
June 17, 2009 10:13:19 PM

stevestock said:
EVGA GeForce 9500 GT 1GB Video Card


If you're using the system for gaming that is a very poor choice.

For that system the Corsair VX550 or HX520 is plenty.
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June 18, 2009 4:07:58 AM

stevestock said:
I am not sure how large of a power supply to buy for the following build:

Intel Core i7 920 Nehalem 2.66GHz Processor
ASUS P6T Deluxe V2 Intel X58 MoBo
EVGA GeForce 9500 GT 1GB Video Card
G.SKILL 6GB (3 x 2GB) 240-Pin DDR3 SDRAM 1333 (PC3 10666)
2x Western Digital VelociRaptor 300GB 10000 RPM Internal Hard Drive
LG Internal Blu-ray/HD DVD-ROM & 16X DVD±R DVD Burner
Thermalright Ultra 120 eXtreme - 1366 RT CPU Heatsink+Fan
3 Case Fans
And all the other little stuff...

I plan on overclocking it, and have read that to overclock the i7 to around 4GHz uses approx 400W, but I have no idea how much extra power I need, because I don't want to run a power supply over 90%/95% and have it burn out on me either.

Pardon me, but what is the main purpose of this build?
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June 18, 2009 4:23:45 AM

A 550W would work fine. I'd go with Corsair. Of course, if it is a gaming build, that GPU is a very poor choice, as stated above.
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June 18, 2009 2:31:01 PM

theAnimal said:
If you're using the system for gaming that is a very poor choice.

For that system the Corsair VX550 or HX520 is plenty.



I plan on using this build mainly for gaming, video editing, and collegework. What GPU would you suggest for such a build? I don't need anything crazy, I mainly play TF2, COD, and Left4Dead. Just looking for reliability decent performance as cheap as possible; don;t need to play anything on high settings.

Maybe the GeForce GTX 260 w/216cores?
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June 18, 2009 5:48:54 PM

I recommend the GTX 260 216 cores, great card. Also 650w should be plenty, even with a gtx 260 and a i7, but don't expect to get two gtx 260's on a 650w power supply, for sli you are looking at a 750w.
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July 19, 2009 6:01:38 AM

Power supplies are a great question especially with the i7. I originally had a Q6600 88ooGTX Extreme and 4GIGS DDR2 on a 680iLT mobo. My 600 watt cheapo brand (I forget) was making a loud noise. I got a Corsair TH650X. I then order an i7 920, 6 gigs of DDR3 tri channel 1333MHZ, Asus P6T Deluxe. I salvaged my 8800GTX since it was a great card and I was not ready to upgrade GPU's. My 8800GTX goes out one month into being used with the i7. I baught a GTS 250 OC and Crysis keeps crashing now. I cannot keep Crysis running past 5 or 10 minutes. BFG the maker of that POS card said that my 12 volt system should not be at 11.4 which they said could cause a problem. I do not think the 650 watt power suplly is enough for my specs. Does anyone know of a more recent power supply estimator or a method of calculating the needed voltages?
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a b ) Power supply
July 20, 2009 12:35:10 AM

ryanhell078 said:
Power supplies are a great question especially with the i7. I originally had a Q6600 88ooGTX Extreme and 4GIGS DDR2 on a 680iLT mobo. My 600 watt cheapo brand (I forget) was making a loud noise. I got a Corsair TH650X. I then order an i7 920, 6 gigs of DDR3 tri channel 1333MHZ, Asus P6T Deluxe. I salvaged my 8800GTX since it was a great card and I was not ready to upgrade GPU's. My 8800GTX goes out one month into being used with the i7. I baught a GTS 250 OC and Crysis keeps crashing now. I cannot keep Crysis running past 5 or 10 minutes. BFG the maker of that POS card said that my 12 volt system should not be at 11.4 which they said could cause a problem. I do not think the 650 watt power suplly is enough for my specs. Does anyone know of a more recent power supply estimator or a method of calculating the needed voltages?


Should've started a new thread for this. :) 

The TX650 is more than enough for your system. How did you measure the 11.4V? If you didn't use a DMM then you should.
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July 20, 2009 1:43:04 AM

theAnimal said:
Should've started a new thread for this. :) 

The TX650 is more than enough for your system. How did you measure the 11.4V? If you didn't use a DMM then you should.


I am using a few different pieces of software to obtain voltages. The first is System Information for Windows (SIW), and the next is PC WIzard (upon suggestion by BFG Tech). PC Wizard shows 11.4 on the 12 volt pretty regularly. SIW reports the 12 volt as 12.10 . I would like to see something that is a little more real time and I already questioned the accuracy of either test. I am unsure what a good software is to determine if these voltages are the cause of my Crysis crashes.

Also: I am tempted to move this to a new thread if you think I should. Thanks for your help!
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a b ) Power supply
July 20, 2009 2:29:32 PM

Software readings cannot be trusted. Use a DMM.
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July 20, 2009 7:08:08 PM

theAnimal said:
Software readings cannot be trusted. Use a DMM.


Thanks. I have to pick my meter up from a friends acrost town.
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