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Recommended Power Supply Wattage Anyone? (Rig Builder)

post #1 of 14
Thread Starter 
Hi,
I would like to know whats the Recommended PSU Wattage for my Build.

List

1. ASRock 990FX Extreme3 AM3+ AMD 990FX
2. AMD FX-8350 Vishera
3. G.SKILL Ripjaws X Series 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
4. Western Digital WD Green WD20EARX 2TB
5. OCZ Synapse Cache SYN-25SAT3-64G 2.5" 64GB
6. CORSAIR Hydro Series H60 (CW-9060007-WW)
7. 6 Quality XIGMATEK 120mm CLF-F1255 120mm Purple LED Fans
8. MSI R7850 Twin Frozr OC AMD Radeon HD 7850 2GB GDDR5
9. Pioneer Blu Ray Combo BDC-207DBK
10. NZXT Aperture M Internal 5.25-Inch Mesh Card Reader with 2x USB 3.0

All in a Cougar Solutions ATX Mid Tower. thumb.gif


post #2 of 14
Hi there,

I don't believe you are allowed to ask questions in this section of the forums );

But to answer your question anyway, 500W should be about enough to power you entire system. In the future, you could use http://support.asus.com/powersupply.aspx to get a rough estimate! biggrin.gif
post #3 of 14
Answer the question before I can suggest you the correct PSU:
Do you plan to go for crossfire setup in future?
post #4 of 14
Ideally, you want to run at 50% capacity, if you can afford it. this includes if you later want to upgrade so a buffer is nice of some wattage, although you can be fine operating at 80% capacity, keep in mind that leaves little room for upgrades, and will reduce the lifespan but probably not by too much of a noticeable amount to you.

do not forget to factor in the approx mean and max wattage of the components you are getting. then adding a 25% buffer minimum if you even want to think about upgrading. 50% would be better, and even better would be double the needed wattage.

example of that math:

500 watt draw w/ 25% buffer would be 625Watts (650 watt PSU)
500 watt draw w/ 50% buffer would be 750Watts
500 watt draw w/ 100% buffer (2 times needed power) is 1,000 Watt power supply. a PSU is an investment for the computer. which can be used later on with upgrades or a new build. unlike other components that when upgrading, are switched out usually. So get the best one you can afford for your system.

there will be people here that will tell you at 500 watt draw a 500 or 550 watt PSU is sufficient, and while it may work (for a while) keep in mind with electronics its the same as if you were running your engine at high/max rpm for long, while it will run for some time. it will increase the amount of wear until failure. the less you tax components the longer and more efficiently the run (generally)

here is a GENERAL Guide to power draws, keep in mind higher end components (namely GPU, and in some cases CPU these will be higher):



Use this for generalization, but make sure to add a buffer for actual values. or look at the components power ratings on spec sheets etc.
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post #5 of 14
^^ Those general rules do not work anymore..
Outdated info, I should say.
post #6 of 14
Thread Starter 
No CrossFire but I will Overclock The AMD 8350.
post #7 of 14
Quote:
Originally Posted by AnthonyBrown93 View Post

No CrossFire but I will Overclock The AMD 8350.
ok!
a 8350 OC to 4.8Ghz @ 1.5 volts:


that had a GTX 680 for full system specs see HERE which was taken from the wall with a PSU that is rated 87% @ that load so 364*.87= 317 watt

now lets add a 7850 (btw, the maximum is stressing with furmark)


so you're looking at 436 watts while OCing the CPU and running prime 95 AND furmark at the same time! - gaming will be much less.

BUT what gets neglected is what the system idles at - PSUs take a huge nose dive in efficiency when under 20% of its rated load, around 4% - 9% depending on if its 80+, bronze, silver, gold ect.; the higher the "rating" the lower the efficiency loss.

so lets look at some IDLE numbers, eh?


lets use the same PSU efficiency formula though it will be less but it will error on the side of caution 160*.87 = ~139 watts. i am not going to include the 7850 idle usage since the system already has GTX 680 which consumes about the same.


since its nice to keep the max load under 80% - 436/.80= 545 watts
and to keep the idle above 20% - 139/.2 = 695 watts

SO you're good with any PSU that will continuously supply 550 watts but not more than 700 650 watts.

i changed my mind in suggesting the upper end of the wattage - wink.gif
Edited by looniam - 5/27/13 at 1:25pm
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post #8 of 14
650W is more than enough thumb.gif
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post #9 of 14
Thread Starter 
Thanks for the Educational Information and so Basically 650 Watt PSU is :rolleyes:ded.
post #10 of 14
Quote:
Originally Posted by AnthonyBrown93 View Post

No CrossFire but I will Overclock The AMD 8350.
A very good 550/600Watt PSU will suffice in your case.
Make sure it have at least 80+ Silver certification.
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