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How many watts will I need for this spec?

Last response: in Components
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May 12, 2012 6:33:47 PM

Hi everyone, I think I have a faulty PSU because my computer keeps crashing during stress like Crysis 2. I have a Seasonic PSU:

http://ncix.com/products/?sku=52173&vpn=S12II%20520&man...

Could someone please tell me how many watts I will need in order to be stable?

Thanks a lot


Oops I forgot about the specs, here they are:

Mobo: ASUS M4A87TD
GPU: Radeon HD 7950
CPU: AMD Phenom II X4 965 Black Edition
RAM: 8GB

More about : watts spec

May 12, 2012 6:39:54 PM

Well it would help if you listed your whole system specs but since your running crysis 2 I assume your cpu and graphics is pretty decent. I would recommend at least 700w but please note this is a complete estimate based on the information you provided.
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May 12, 2012 6:42:57 PM

Oops I forgot about the specs, here they are:

Mobo: ASUS M4A87TD
GPU: Radeon HD 7950
CPU: AMD Phenom II X4 965 Black Edition
RAM: 8GB
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a b ) Power supply
May 12, 2012 6:50:04 PM

What are the symptoms and is your system overclocked? How's the temperature? Are there any viruses in your system?


A Seasonic S12II 520 is more than powerful enough for one 7950 and a P4 965BE. It is from a great manufacturer and is of a very high quality build so i doubt it's the culprit but you never know.
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Best solution

May 12, 2012 6:51:38 PM

Ok, I think your cpu will use about 100W (unless you overclock) so 150
Radeon 7950 - I would say 200-300
Ram - lower than 100
Mobo - not sure... maybe 100 or more.

After doing the math the numbers are close to 600 so 700 would be enough
Note that it could not be the psu and some other issue.
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May 12, 2012 6:54:26 PM

fgin23 said:
Ok, I think your cpu will use about 100W (unless you overclock) so 150
Radeon 7950 - I would say 200-300
Ram - lower than 100
Mobo - not sure... maybe 100 or more.

After doing the math the numbers are close to 600 so 700 would be enough
Note that it could not be the psu and some other issue.


Okay thanks, I'm pretty sure that my PSU was the culprit. Can a shortage of 80 watts cause the comp to crash? that's what I think is the problem
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May 12, 2012 7:05:40 PM

leech33s said:
Okay thanks, I'm pretty sure that my PSU was the culprit. Can a shortage of 80 watts cause the comp to crash? that's what I think is the problem


A shortage of any amount of watts is not good.
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a c 1184 ) Power supply
May 12, 2012 7:06:22 PM

For a system using a single reference clocked Radeon HD 7950 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 30 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.

Overclocking of the CPU and/or GPU(s) (i.e. factory or manual) will require an additional increase to the combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock you are trying to achieve.

The Seasonic S12II Bronze Series 520W (S12II-520Bronze), with its combined +12 Volt continuous current rating of 40 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single Radeon HD 7950.

Unless you're doing some extreme overclocking the PSU should be more than sufficient.
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May 12, 2012 7:08:16 PM

ko888 said:
For a system using a single reference clocked Radeon HD 7950 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 30 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.

Overclocking of the CPU and/or GPU(s) (i.e. factory or manual) will require an additional increase to the combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock you are trying to achieve.

The Seasonic S12II Bronze Series 520W (S12II-520Bronze), with its combined +12 Volt continuous current rating of 40 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single Radeon HD 7950.

Unless you're doing some extreme overclocking the PSU should be more than sufficient.


According to this post the PSU is not the source of your problem
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a c 1184 ) Power supply
May 12, 2012 7:12:47 PM

Describe the crash.

Do you get a blue screen of death or any error messages that may indicate the cause?

Have you checked the Windows Event logs for Error events?
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May 12, 2012 7:13:45 PM

fgin23 said:
According to this post the PSU is not the source of your problem


Then what's the problem? Ugh... please reply fast I have to go to computer shop in ten minutes because of this power supply. What should I do? My CPU AND PSU weren't overheating right before the time of crash.

Sorry I didn't mean to sound grumpy I just typed in a hurry.

And oh to ko888, there's no prior warning, screen just goes poof and comp shuts off.
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a b ) Power supply
May 12, 2012 7:15:36 PM

WE NEED INFORMATION. Answer the above queries! Any overclock? Error screens? BSOD's? Viruses?
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May 12, 2012 7:17:05 PM

lilotimz said:
WE NEED INFORMATION. Answer the above queries! Any overclock? Error screens? BSOD's? Viruses?


No overclock (but I intend to do it when I achieve stability)
No error screens, comp just goes poof and pitch black and shuts off
No BSOD
No viruses
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a c 1184 ) Power supply
May 12, 2012 7:20:22 PM

leech33s said:
Then what's the problem? Ugh... please reply fast I have to go to computer shop in ten minutes because of this power supply. What should I do? My CPU AND PSU weren't overheating right before the time of crash.

Sorry I didn't mean to sound grumpy I just typed in a hurry.

And oh to ko888, there's no prior warning, screen just goes poof and comp shuts off.

I'm not saying that the PSU isn't defective but if its working properly you shouldn't be experiencing a loss of power event. The OCP trip point may have been set too low from the factory.

Does the problem also occur when you run Furmark GPU stress testing?
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May 12, 2012 7:20:29 PM

If I were you I would just go for a higher watt psu and see if the problem continues.
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a c 243 ) Power supply
May 12, 2012 7:33:26 PM

fgin23 said:
If I were you I would just go for a higher watt psu and see if the problem continues.

That's pointless
His X4-965BE draws 25 watts or so less than the I7-965XE in this review of the 7950

http://www.guru3d.com/article/powercolor-radeon-hd-7950...

Lack of power isn't the problem unless the psu is faulty, not because it can't provide much more than enough
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May 12, 2012 9:16:52 PM

ko888 said:
For a system using a single reference clocked Radeon HD 7950 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 30 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.

Overclocking of the CPU and/or GPU(s) (i.e. factory or manual) will require an additional increase to the combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock you are trying to achieve.

The Seasonic S12II Bronze Series 520W (S12II-520Bronze), with its combined +12 Volt continuous current rating of 40 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single Radeon HD 7950.

Unless you're doing some extreme overclocking the PSU should be more than sufficient.



rubbish you can use watts instead


watts =volts*amps

so at 12v and 40amps = 480watts


if your psu has different rails work them out using that method above
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a c 243 ) Power supply
May 12, 2012 10:33:19 PM

shanky887614 said:
rubbish you can use watts instead


watts =volts*amps

so at 12v and 40amps = 480watts


if your psu has different rails work them out using that method above


So this is 514 watts ?
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May 13, 2012 12:14:04 AM

ko888 said:
For a system using a single reference clocked Radeon HD 7950 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 30 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.

Overclocking of the CPU and/or GPU(s) (i.e. factory or manual) will require an additional increase to the combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock you are trying to achieve.

The Seasonic S12II Bronze Series 520W (S12II-520Bronze), with its combined +12 Volt continuous current rating of 40 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with a single Radeon HD 7950.

Unless you're doing some extreme overclocking the PSU should be more than sufficient.



hahaha i think i have seen you post this or something similar about 20 times.
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a c 80 ) Power supply
May 13, 2012 12:47:02 AM

fgin23 said:
Ok, I think your cpu will use about 100W (unless you overclock) so 150
Radeon 7950 - I would say 200-300
Ram - lower than 100
Mobo - not sure... maybe 100 or more.

After doing the math the numbers are close to 600 so 700 would be enough
Note that it could not be the psu and some other issue.


More like,

CPU is rated at 140 watts, but will not take THAT much
Video card will have trouble hitting 200(this would be without pushing powertune up). Closer to 150 is most games
Ram 100? What? would be lucky if a stick of memory took 5 watts(and most should NOT).
Motherboards can vary lots, but 100 may be too much as well.

Point in case, no shortage of power.

As listed above, if you have a power issue, it is a defective power supply, not an actual lack of power.

I ran a 955BE @ 3.7/5870 with a 550 watt power supply from OCZ. Your power supply is better.

To add to this my 2600K @ 4.4 with a 5870 2 hard drives and 2 ssds and a 5870 never pulls over 300 from the wall :) 

This was my 955BE system just for reference. I may have pulled more with some tweaks(prime can load the cpu to the point that the video card can not work as hard), but you get the point.

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May 13, 2012 2:40:14 AM

leech33s said:
Hi everyone, I think I have a faulty PSU because my computer keeps crashing during stress like Crysis 2. I have a Seasonic PSU:

http://ncix.com/products/?sku=52173&vpn=S12II%20520&man...

Could someone please tell me how many watts I will need in order to be stable?

Thanks a lot


Oops I forgot about the specs, here they are:

Mobo: ASUS M4A87TD
GPU: Radeon HD 7950
CPU: AMD Phenom II X4 965 Black Edition
RAM: 8GB

in reality it only need about 400 or less so i'd recommend a 500 w so u'll have a little less surplus. Look at some benchmarks with 7970, they only reach i don;t know maybe 300 or less with intel cpu and mobo and ram with it. the 100W is for cooling system and overclocking
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May 17, 2012 9:28:44 AM

Best answer selected by leech33s.
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May 17, 2012 9:29:00 AM

Thank you everyone, the culprit was the lack of watts in the PSU!
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a c 243 ) Power supply
May 17, 2012 10:55:44 AM

leech33s said:
Thank you everyone, the culprit was the lack of watts in the PSU!

Was only a lack of watts if the psu was faulty
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a c 80 ) Power supply
May 17, 2012 6:50:05 PM

delluser1 said:
Was only a lack of watts if the psu was faulty

+999999
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