How many watts will I need for this spec?

leech33s

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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&manufacture=Seasonic%20Electronics

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
 
Solution
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.

fgin23

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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.
 

lilotimz

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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.
 

fgin23

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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.
 
Solution

leech33s

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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
 

fgin23

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A shortage of any amount of watts is not good.
 
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.
 

fgin23

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

leech33s

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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.
 

leech33s

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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
 

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?
 

shanky887614

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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 ?
43a.jpg
 

mercer95

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hahaha i think i have seen you post this or something similar about 20 times.
 


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.

prime955at37.png
 

mykebrian

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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