Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: I need an advice in choosing new PSU

08 Sep 2015   #1

Windows 7 Professional 64-bit
I need an advice in choosing new PSU


My backup computer's PSU (Enermax Triathlor 550W) was malfunctioning and after warranty service check it was beyond repairs. Since this model was not available for sale anymore they offered me to choose a new one from my retailer shop and pay the price difference.
I have two choices: 1) pick less expensive for backup PC; 2) pick good one for main PC and move it's PSU to backup PC.
My main PC has Enermax Platimax EPM600 AWT model and using Enermax PSU calculator recommended minimum PSU wattage is 377W. I plan, however, upgrading it's video card in the future, but the model GeForce 960Ti is not released yet (if ever will be) and when I use GeForce 970 in calculator it says recommended power 450W (542W in SLI mode).

Retailer shop, where I can pick PSU from, has poor choice of Enermax PSU, they are either bronze or gold certified and only platinum they have is 1350 watt. I don't want to pay extra for watts I won't use, but I prefer extra 30% for unforeseen circumstances and wearout, which would be 700 watt or around.

There are other known brands like Corsair, Cooler Master, etc., but I am unfamiliar with their PSU.
I've made calculations and difference between bronze and platinum would pay off in a year.
From experience, all kind of circuitry protection is important, like over-voltage, under-voltage, over-current, short circuit, etc.
Lastly, from what I have heard, active Power Factor Correction is better than passive, but I don't really know why except better power efficiency.

Basically, I need power efficiency and safety for main PC and safety with small power efficiency for backup PC.
You can visit my retailer shop web page to check available models, but it is in Latvian. You can try Google translate the web page, but unfortunately, filter doesn't work in Google translate. Here is the link Barošanas bloki (PSU) :: Datoru komponentes ::

I appreciate any advice, since PSU is most important part for healthy computer.

My System SpecsSystem Spec
08 Sep 2015   #2

Win-7-Pro64bit 7-H-Prem-64bit

Personally I would get a EVGA model either a P2 if you can stand the price or G2 version of what ever wattage you want too,
I just sent back a RM850 because it just looked cheap and so did the wiring I wouldn't expect any improvements in lower wattage units from Corsair.

Most if not all psu's will have safety features.
My System SpecsSystem Spec
08 Sep 2015   #3

Windows 7 Professional 64-bit

Hello ThrashZone,

Thank you for your reply! Unfortunately, the shop I am bound to pick from doesn't have EVGA PSU available (and there are only 4 shops selling EVGA PSU, out of 100+ shops in computer market in Latvia), but their graphic cards are widely available though. Anyway, I will keep in mind your advice.
Corsairs best PSU are from AX series and the RM series is somewhere in the middle.

Platinum certified PSU available are from Cooler Master (1200W expensive one), Corsair (5 models AX and HX series), Enermax (1350W expensive one), Fortron PT1200 (1200W, cheaper than Corsair 860W models) and SilverStone SST-NJ520 (520W, never heard that brand before).

While going for cheaper gold certified models, there are more varieties to pick from: AeroCool, Chieftec, Cooler Master, Corsair, Enermax, Fortron, Fractal Design, LEPA, NZXT, SilverStone, Thermaltake.

From platinum certified models, I see only Corsair AX760, AX860, AX860i and HX850i (passive PFC model) as realistic choice. I don't know, whether they are reliable or not and if they aren't I have to pick less wattage, but more reliable PSU for my backup PC.
My System SpecsSystem Spec

08 Sep 2015   #4

Win-7-Pro64bit 7-H-Prem-64bit

In comparisons in price evga's are more reasonable than Corsairs in any flavor.
Cables alone evga is better and more versatile.
My System SpecsSystem Spec
08 Sep 2015   #5

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, 64-bit

The Platinum, Gold, Silver, and Bronze ratings have little to do with quality. It's just an efficiency rating.

The online calculators are notoriously inaccurate and typically tell you to buy more than you need because they need to allow for the fact that you might pick a poor quality PSU that can't reliably deliver its stated capacity.

The Corsair AX and HX series are good, made by Seasonic the last I checked.

I'd get the cheapest one of those models I could find between 500 and 600 watts. That's plenty of power for any single video card.

If you might go to 2 video cards, then maybe go above 600 watts.

I did the calculation on how much improved efficiency saves.

If my PC is on 13 hours a day, 365 days a year, each percent improvement in efficiency will save about a dollar a year, given an electricity rate of 15 cents per KWH. That's for a PC that normally uses 80 to 100 watts measured by a Killawatt meter and occasionally uses up to 140 watts.

If you pay more for power, or actually use more power than that, or leave your PC on more than 13 hours a day, you'd save more than I do. Convert for your usage, your power rate, and your currency.
My System SpecsSystem Spec
08 Sep 2015   #6

Windows 7 Professional 64-bit

Hello ignatzatsonic,

Thank you for your reply! I would prefer both, efficiency and quality. According to efficiency graph, it's peak is at 50% load.

I pay ~1 EUR (~1.12 USD) for each KWH (used to be much cheaper before our country joined EU, but that's different story). PC is running 24/7 and more I can save the better. I measured watt usage with APC Back-UPS, it was 235W and above, depending on load. That would make ~20 EUR for each percent per year.

Thank you for all the information.
My System SpecsSystem Spec
08 Sep 2015   #7

Win-7-Pro64bit 7-H-Prem-64bit

Just for the record the RM850 is a gold certified psu and what the retailer was supposed to have so that is why I mentioned it
It is supposed to be on a set ECO mode but also as other models have a corsair link software utility to fine tune I suppose.
Whether other gold certified models are available or RM850 or lower you have not said which exact models the retailer has.
Also a Limited 5 year Warranty

EVGA P2 and G2 models have a ECO switch.
My System SpecsSystem Spec
09 Sep 2015   #8

Windows 7 pro x64 (or win 10 pro)

Seasonic g series is good, so is their m12ii series but thats only bronze.
My System SpecsSystem Spec

 I need an advice in choosing new PSU

Thread Tools

Similar help and support threads
Thread Forum
Upgrading Motherboard from Z77P-d3 and need advice choosing!
Hello all, I am upgrading my z77p-d3 motherboard as i was told it cannot my overclocked. i was recommended GA-Z68XP-UD3 but i cannot find one for sale anywhere. what is a good motherboard to go for? I dont mind paying a little more for a better board either. specs are 1155 intel 3770k GPU is...
Hardware & Devices
Advice on choosing new laptop
My dad has an old Acer running XP 1Gb Ram slow CPU and now support has come to an end hes looking to buy a new one hes seen a couple but i just thought id ask if theres any preference. Now we are in the UK so not sure if that helps or hinders the choices if you going to suggest places to buy. ...
General Discussion
Advice needed for choosing a new router
The best thread I found searching is this one: But the latest posts are two years old so I want to be sure my information is current. What I now have is a personal desktop computer connected directly to a...
Network & Sharing
New help in choosing which OS to buy.
Hi, I am having a bit of a conflict at the moment. The thing is, I have 4 Pc´s which I wanna upgrade. I am an yurop resident which I believe complicates things. And I need some advice in choosing the correct OSés. 1. HP Laptop which has Vista 32-bit home premium. I wanna upgrade to Windows 7...
General Discussion
Photoshop - advice choosing my new HP
I am purchasing a new computer and software. I plan to get the HP Pavilion Elite 180t desktop. I've been using the old Photoshop CS for a few years, but I will be upgrading to Photoshop CS4. I will be using it to do layering for posters and for enhancing digital photos. I do not do gaming. ...
Graphic Cards

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

© Designer Media Ltd

All times are GMT -5. The time now is 17:12.
Twitter Facebook Google+