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Help choosing a Power Supply

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May 25, 2012 3:31:30 PM

I have most of the components for my first build except the Power Supply, Case, and Memory.
I came across what looks like a decent deal on the following PSU:

Antec EarthWatts Series EA-750 Green 750W ATX12V v2.3 SLI Certified CrossFire Certified 80 PLUS BRONZE Certified Active PFC Continuous Power Supply - $69.99 after $20 MIR

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

There are a few things I am unsure of. I posted a thread a few weeks ago for help with my build and I got a few suggestions but the one I planned on getting had a lot of bad reviews regarding the fan sounding like it was either going to "blast off" or "dry your hair" lol. Being a little bit louder isn't a big deal but if it is really as loud as they are saying then that is too much. There is one spec that I got a suggestion on that this Antec PSU doesn't match. I was told to get a PSU with:

1 +12V Rail but this one has 4 +12V Rails

1. Does 4 +12V Rails make this Antec better, worse or just better suited for some particular application(s)?
2. What else should I know about the costs/benefits of 1 +12V Rail versus multiple +12V Rails?
3. What is PFC? What does it do? What does Active mean for PFC?
4. Will this PSU even go well with what I have listed below?
5. Maybe help guiding me through these specs as well:
a. Should I get a modular instead? Is it a must have?
b. Is there enough current, watts, connectors, efficiency?
c. Is 80 PLUS bronze good enough or should I go with something better?


These are the components that I currently have purchased:
Intel i7-2600k
Radeon HD 6850 - I may end up getting a second card soon or might be a little bit. I will how it runs with one first.
ASUS P8Z77-V motherboard - ATX board
Crucial CT256M4SSD2 M4 2.5 Inch SSD - 256GB, SATAIII 6Gb/s
Seagate 1TB HDD

I plan to get:
16GB+ 1333 RAM - since that is the max my CPU supports
Not sure about case yet. Could use suggestions with this as well. Need help with the following:

1. What to look for?
2. Quality brands?
3. Specs or Features to look for aka must have features? and
4. Really what would go best with what i have listed here?


The only game I play is Starcraft right now. I also use AutoCAD electrical, Matlab, NX7.5, and maybe some solid works as well.

Sorry for so many questions. I'm fairly new to doing this and only have basic knowledge on a lot of this.
Thanks in advance!

More about : choosing power supply

a c 165 ) Power supply
May 25, 2012 4:37:36 PM

wow a lot of questions

1. the rail split makes no difference (see link below), yours has just been split x4. the key on the 12v is the power it can provide meets your needs. your selection does. you picked a solid PSU, if fact the earthwatt 500w would power your system with no problem but the 750w version will let you run CF down the road if you want.

http://www.overclockers.com/forums/showthread.php?t=548...

2. see link and jonnyguru reply (second post)

3. Power Factor Correction (PFC) allows power distribution to operate at its maximum efficiency. There are two types of PFC, Active PFC and Passive PFC.

Active PFC
The preferable type of PFC is Active Power Factor Correction (Active PFC) since it provides more efficient power frequency. Because Active PFC uses a circuit to correct power factor, Active PFC is able to generate a theoretical power factor of over 95%. Active Power Factor Correction also markedly diminishes total harmonics, automatically corrects for AC input voltage, and is capable of a full range of input voltage. Since Active PFC is the more complex method of Power Factor Correction, it is more expensive to produce an Active PFC power supply.

Passive PFC
The most common type of PFC is Passive Power Factor Correction (Passive PFC). Passive PFC uses a capacitive filter at the AC input to correct poor power factor. Passive PFC may be affected when environmental vibration occurs. Passive PFC requires that the AC input voltage be set manually. Passive PFC also does not use the full energy potential of the AC line.

was lazy and copied from a previous tom's post

4. yes, see my reply to Q1

5. a- modular is not a must have. frankly to me a modular - non-modular question is pointless since I use a lot the PSU cables. those i don't i just zip tie together and hide in the HDD cage. Currently one of my PSU is modular the other is non-modular although I've done several build with both.
b- yes
c- 80 bronze efficiency is good for a modern day PSU although it won't necessarily make a PSU better then a better quality 80+ PSU. internal build is still the key for a PSU, the earthwatt series is solid for the price.

ram questions

1 - ram that meets your motherboard's spec, 1333mhz, 1600mhz, etc.,
2- there are only a handful of RAM suppliers so brands really don't mean that much. they are just a sticker on a heat spreader most of the time
3- as long as it works, its good
4 - corsair, pny, patriot, crucial,gskill, are all good and will do the job.


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May 25, 2012 5:42:20 PM

Haha yeah I always have a lot of questions. Just want to make sure I don't make a mistake or at least lessen my chances. Your post has helped a lot. Especially the link to the 1vs4 12v rails. Thank you for the information.

Also, at the end of my post I was asking about case suggestions not memory but I could have used as information I could get there as well lol.

After reading that post I feel like it doesn't matter going with either 1 or 4 rails but seems less risky to go with 1 rail. Is that what everyone got out of that?
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a c 243 ) Power supply
May 25, 2012 5:55:10 PM

lackofrespect said:
Haha yeah I always have a lot of questions. Just want to make sure I don't make a mistake or at least lessen my chances. Your post has helped a lot. Especially the link to the 1vs4 12v rails. Thank you for the information.

Also, at the end of my post I was asking about case suggestions not memory but I could have used as information I could get there as well lol.

After reading that post I feel like it doesn't matter going with either 1 or 4 rails but seems less risky to go with 1 rail. Is that what everyone got out of that?

I got this
"The bottom line is, for 99% of the folks out there single vs. multiple +12V rails is a NON ISSUE"

Your psu of choice is overkill even if you overclock the snot out of the cpu and double up on the cards, no reason at all to worry about how many 12v rails it has
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May 25, 2012 6:08:55 PM

Really? I was told to get at the very least a 600-650 and that would cut it close with crossfire and most recommended a 700. What would you think I would need or recommend for what I have/will have. I do plan to crossfire down the road if not soon.
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a c 165 ) Power supply
May 25, 2012 7:12:48 PM

lackofrespect said:
Really? I was told to get at the very least a 600-650 and that would cut it close with crossfire and most recommended a 700. What would you think I would need or recommend for what I have/will have. I do plan to crossfire down the road if not soon.


the AMD 6850 does not draw that much power. a 650w unit will do the job for two amd 6850s. the unit you linked will also do the job and it's a good price. to back up what delluser stated, you won't break 400w total system power while gaming with dual AMD 6850's



cases are mostly about looks. tom's just posted a review of 5 cases, hardware secrets always reviews cases. get the one that you like looking at. off the top of my head, cooler master HaF 922, corsair 400r/500r, antec 902, NZXT phantom just to name a few.
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