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Is my PSU big enough? - Page 2

post #11 of 16
dont use the COoler master eXtreme,Real,etc series PSU except the silent series
READ THIS
post #12 of 16
the cheapest and a reliable PSU is for 50$
Rosewill Green Series 530W 50$
a 450w is the minimum requirement for a 6850 have a look in my sign wink.gif
post #13 of 16
edit:
nvm, dont want to start a war.
post #14 of 16
These threads easily turn into "wars" when there is a simple, objective means to determine the the total PSU power and the 12v rail power required to run a specific PC under full load. It's important to understand that you primarily need the correct current (amps.), on the 12v rail as it powers most of the PC. Total PSU power alone is not sufficient.

Not all PSU calculators are as accurate as the link below. If you properly input data on your PC hardware into the link below you will get a correct result for the power required. You can determine how much if any safety margin you desire. For reliability purposes you would not want your PSU to be running above 90% capacity under heavy load like gaming, which is typically close to the full load power consumption.

http://extreme.outervision.com/psucalculatorlite.jsp

You can determine how much power your Vid card draws full load by checking reputable review sites. Whatever the total wattage is, just divide by 12 to determine the 12v amps. required on the 12v rail to power the Vid card under full load. For a typical PC you might need 15 amps. to run all the hardware plus whatever the Vid card requires.

As an example from the chart at the link below. The HD 5850 draws 151.2 watts under Max load, divided by 12 = ~12.6 amps. under Max load. Round that to 13 amps. and add ~15 amps. for the rest of your PC and that means you need a minimum of 28 amps. on the 12v rail if you have just one HD 5850 Vid card. No guessing is required and you know if your PSU will work or if a potential PSU you are considering to purchase will meet your current and future needs.

http://www.geeks3d.com/20100226/the-real-power-consumption-of-73-graphics-cards/

When you start OC'ing the CPU, the power consumption can increase rapidly, especially with 6 or 8 core CPUs and voltage increases. In that case you will need to bump up the available 12v rail amps. considerably. The PSU calculator link above allows you to input what CPU voltage and frequency you plan to use to get a proper calculation of total system watts when OC'ing.

Once you know what you need for 12v rail power in a PSU, then you can check www.jonnyguru.com or www.hardwaresecrets.com for actual PSU reviews on the specific model PSU that you are interested in. Don't buy on brand name alone unless it's Seasonic or PC Power and Cooling. Many brands use different manufacturers and some models may be OK while other models in the same series are clunkers. Be informed before your spend your money. thumb.gif
Edited by AMD4ME - 3/1/12 at 7:14am
post #15 of 16
Thread Starter 
Read the hardware secrets review on the Cooler Master. I'm surprised its so bad considering the Cooler Master name. Doesn't seem to be like it should be legal to advertise a 500W rating if your unit can't maintain specification throughout the entire range. On the other hand it looks like I should be fine for now with my Antec as long as I leave everything at stock. I appreciate the information. In the future I won't purchase any power supplies unless I can find a legitimate review on it.

Edit: Is the cooler master really that bad though? What are the long term effects of excessive noise and ripple? Component degradation?
Edited by Roonie - 3/1/12 at 10:15am
    
CPUMotherboardGraphicsRAM
FX-4100 Gigabyte GA-78LMT-SP2 HIS Radeon HD6850 Corsair XMS3 8GB (2x4GB) 
Hard DriveCoolingOSPower
Old WD drive CoolerMaster Hyper 212+ Windows 7 Ultimate Edition x64 Antec TruePower Trio 430W 
CaseMouse
Cheap Old Apevia Piece of Junk The Original Microsoft Optical Mouse 
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Reply
    
CPUMotherboardGraphicsRAM
FX-4100 Gigabyte GA-78LMT-SP2 HIS Radeon HD6850 Corsair XMS3 8GB (2x4GB) 
Hard DriveCoolingOSPower
Old WD drive CoolerMaster Hyper 212+ Windows 7 Ultimate Edition x64 Antec TruePower Trio 430W 
CaseMouse
Cheap Old Apevia Piece of Junk The Original Microsoft Optical Mouse 
  hide details  
Reply
post #16 of 16
Quote:
Originally Posted by Roonie View Post

Read the hardware secrets review on the Cooler Master. I'm surprised its so bad considering the Cooler Master name. Doesn't seem to be like it should be legal to advertise a 500W rating if your unit can't maintain specification throughout the entire range. On the other hand it looks like I should be fine for now with my Antec as long as I leave everything at stock. I appreciate the information. In the future I won't purchase any power supplies unless I can find a legitimate review on it.
Edit: Is the cooler master really that bad though? What are the long term effects of excessive noise and ripple? Component degradation?

Noise and ripple can cause CPU and RAM errors. Yes some popular brands sell very poor quality PSUs and other components... redface.gif
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