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Which of these PSU will work for me?

post #1 of 20
Thread Starter 
My Zalman 750HD just ain't cutting it anymore. An overclocked 940 and 7970 is causing the PSU to shut down and I have to reset it (turn the PSU power switch off and on) to reboot the computer. So, I am heading up to MicroCenter tomorrow on a mission. To find a replacement. I dont think I will need more than an 850 since I will not be crossfiring the 7970, and when I find an 1100, that will cut down the CPU wattage as well. These will be my selections:

Thermaltake Smart Series 850
OCZ Z Series 850
Corsair Enthusiast 850
Enermax LEPA 850
OCZ ZX850http://www.microcenter.com/single_product_results.phtml?product_id=0356836
Corsair Pro 850

The last two are a little over my budget, but if I have to, I will.
post #2 of 20
Quote:
Originally Posted by ericld View Post

e I will not be crossfiring the 7970, and when I find an 1100, that will cut down the CPU wattage as well. These will be my selections:
Thermaltake Smart Series 850
OCZ Z Series 850
Corsair Enthusiast 850
Enermax LEPA 850
OCZ ZX850http://www.microcenter.com/single_product_results.phtml?product_id=0356836
Corsair Pro 850
The last two are a little over my budget, but if I have to, I will.

uhm not crossfiring and a single 7970 on an 850 is extreme overkill a 7970 needs no more then 500 watts seems your zalman might be faulty thats why its shutting down


this is pretty much more the enough for your system

Antec High Current Gamer 620

PC Power & Cooling Silencer Mk III Series 600 Watt

Corsair Professional Series AX650 650 Watt Modular
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Ultra mega
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CPUMotherboardRAMHard Drive
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Optical DriveCoolingOSMonitor
Hubble telescope Bio organic dark matter when you see it you'll know the irl eyes 
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post #3 of 20
Thread Starter 
I am going to be water cooling in the future, and I have other stuff in the computer too. I kinda figure the Zalman is dying , exactly one month past warranty. Go figure. I know 850 is more than I need, just want to make sure it is future proof.
post #4 of 20
Quote:
Originally Posted by ericld View Post

I am going to be water cooling in the future, and I have other stuff in the computer too. I kinda figure the Zalman is dying , exactly one month past warranty. Go figure. I know 850 is more than I need, just want to make sure it is future proof.
Agreed, + this might help? = http://whirlpool.net.au/wiki/psu_recommendations
post #5 of 20
Since its out of warranty you might as well open it up and check the caps on the secondary... the PSU should be plenty, it might be the OCP (set pretty low to begin with, about 22A iirc).... I suspect that's a first generation Zalman 750 HP (there's no such thing as a Zalman 750 HD as the one mentioned in your sig), which is a pretty solid design, but with CapXon caps in the secondary.... just open it up and look for bulged ones just to make sure.

Look for a Rosewill Capstone for a new unit, the 550W should be plenty, but if you want more you have 650W as well as 750W versions.
post #6 of 20
Since you will not be crossfiring, what exactly are you future proofing for? It's not like graphics cards and CPU's are going to become immensely more power-hungry, rather they are becoming more efficient. An 850 watt PSU is enough to SLI overclocked GTX 480's which are by far worse in power consumption than anything currently offered, and water cooling is not going to add tons to the power requirement as well.

As stated a 550 watt PSU will be plenty for whatever you want to do to your system, it just seems like your current PSU either wasn't designed well or has some faulty parts because it should offer way more than enough power for what you have.
post #7 of 20
Thread Starter 
Interesting that all the PSU calculators tell me that my system draws between 630-670w of power, but dont take into account for either/or CPU, GPU over clocks, or that I have a D2X , a tv tuner, and external eSATA (with power) connection and a bunch of USB devices connected. So that poor Zalman has been running at almost 100% for a while. Now I know there has been a lot of discussion about how much load you want to put on a PSU, but I work with low voltage power supplies all the time and you never ever ever want to load a PSU to 100% and expect it to survive for long. 80% is the max, before you want to step up and 60% optimal to leave some expandability. Why do you think the PSU manufacturers give there best ratings at 50%. Remember, the more load, the more heat. The more heat, the harder it works and the shorter its life. With that said, an 850watt PSU would be optimal, giving me some headroom without going overboard.

I am also looking at this Seasonic from Newegg. I will have to wait for it, but it seems like a good PSU and I can use a 15% off promo.
Or this Thermaltake.
Edited by ericld - 8/12/12 at 7:39am
post #8 of 20
You have no idea what you're talking about... literally.

You have a ~130W CPU (@ <4Ghz), a ~250W VGA (at any clocks @ stock voltage) and additional hardware than will sum up to about 50-70W (at worst)... with higher overclocks on the CPU and VGA you might see an additional 50W, but that's it. What you have there is a <500W under anything except extreme/sub zero benching.
post #9 of 20
Thread Starter 
OK, then go plug in the hardware using Newegg"s PSU calculator, the one recommended on here, even extreme PSU calculator (best one by far) says a minimum of 670 and recommends 750. Also, extreme calculator tells me that my overclocked CPU draws almost 270 watts. Also, I am not looking for people to tell me I dont need this or that, they arent here and dont know what I need or want. Unless you are a psychic??? So. I am just asking which of these PSUs will be the better choice.
post #10 of 20
PSU calculators doesn't provide power draw, but an approximation of what you should buy with a large leeway to take into account lower-end PSUs. Most likely those calculators aren't as good as the OCN's PSUCalc, nor is it as reliable as the knowledgeable users who not only give you a more realistic power draw, but is capable of give you input of each PSU out there - either about the build quality, electrical performance, the technology that is used in it, the power reserve that the PSU has (many of the higher-end power supply are capable of delivering more than what it is rated for). None of the PSU calcs are able to do this, and the only one that close to doing this is the one that I had linked that is made by our previous PSU Editor, Phaedrus2129, and FiX.

Edit: The extreme PSU calculator claim the 670 requires a 750w? o.0 When the 670 in SLI draws <350w at DC output even using Furmark and <300w during gaming condition? http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_670_SLI/23.html
Edited by qwan456 - 8/12/12 at 8:31am
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