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Will a 750w PSU be enough for my system and leave enough headroom for more upgrades?

I know this is an overly asked topic and I'm sorry but I can't decide whether i should get a 750w or an 850w psu. This is my first build so I'm not that experienced.

These are the parts I plan to use:
-Asus Z87-PRO
-Intel Core i5-4670K
-Sapphire R9-290 TRI-X OC 4G GDDR5
-Gskill ARES 8GB
-Western Digital Caviar Black 1TB
-Asus DRW-24B5ST (Optical Drive)
-Noctua NH-U12P SE2
-Fractal Design Arc Midi R2

And these are the PSU's I'm currently looking and their prices in Philippine pesos:
-Seasonic M12II-750 EVO (80+ Bronze) = Php 5,350.00
-Seasonic M12II-850 EVO (80+ Bronze) = Php 6,100.00
-Seasonic X-750 750W (80+ Gold)= Php 6,600.00
-Seasonic X-850 850W (80+ Gold)= Php 8,000.00
-Corsair RM Series RM850W (80+ Gold) = Php 6,500.00

I'm kinda thinking of getting the Seasonic X 850w, becauseI saw that a lot people had good reviewson them but they're more expensive compared with the others. I looked into the Seasonic M12ii PSU's but I couldn't find a lot of reviews on them, so I'm not that sure if they're good. The Corsair RM had good reviews but I looked into the dimensions and found that it was kinda long and I wouldnt be able to put a bottom fan on the case, which I wanted to do so Im not that inclined with buying the Corsair RM.

I'm kinda over the budget and I want to add a UPS in, since I live in the philippines and clean, stable power isn't the best way to describe our electric grid. So I wanna know if 750w is good enough and will give me enough headroom for a modest overclock and for adding more storage such as more HHD's and SSD's in the future, and overall which PSU should I go for.

I plan on getting an Intex IT-1500VA UPS if you guys wanted to know. I couldnt find a 750w or 850w UPS. The closest I could find was a 1000VA=600w (which wouldnt be enough) and a 1500VA=900w. If you guys know any good UPS's that would be better please also let me know.

Thank you so much!!!! :DD
7 answers Last reply Best Answer
More about 750w psu system leave headroom upgrades
  1. Seasonic M12II-850 EVO (80+ Bronze) since it is just as good as the X series. Just unplug the UPS at night to save on electricity and use it as a voltage regulator rather than as an uninterruptible power supply. Charging the battery on the UPS 24 hours a day, 7 days a week isn't all that good for the battery. There is ample time to charge the UPS whenever it is in use and plugged in since it holds a residual charge as well.
  2. Pondering said:
    Seasonic M12II-850 EVO (80+ Bronze) since it is just as good as the X series. Just unplug the UPS at night to save on electricity and use it as a voltage regulator rather than as an uninterruptible power supply. Charging the battery on the UPS 24 hours a day, 7 days a week isn't all that good for the battery. There is ample time to charge the UPS whenever it is in use and plugged in since it holds a residual charge as well.


    Okay I'm thinking of getting the Seasonic M12II-850 EVO now. I was just unsure because it has few reviews, but it's made by Seasonic so I guess its good.

    Regarding the UPS, do you mean there is an option in the UPS where you could use it as a voltage regulator or I should just unplug it at night to conserve energy? Originally I was only looking for a voltage regulator since I didnt really need a UPS just yet, but I could only find an AVR that could handle the 500w in the website where I plan on buying the parts.
    Oh! Thanks for the quick answer!!!!
  3. Best answer
    Hi, I recently did some testing with an energy reader for my gaming rig, and found it doesn't use more than 220W during intensive gaming (see this link http://www.tomshardware.co.uk/forum/id-2158335/power-consumption-results.html). Apparently your CPU uses slightly less power that mine according to this link http://www.bit-tech.net/hardware/2013/06/12/intel-core-i5-4670k-haswell-cpu-review/6. Also your graphics card appears to use between 2-2.5x more power (peaks about 350watts according to this link http://www.tomshardware.com/reviews/radeon-r9-290-and-290x,3728-4.html). All in all the 750watt will be more than enough unless you want 2 gfx cards instead of 1. You won't agree with me, but you could probably push that system you described all the way down to a 600W psu and it would have around 80-100Watts spare.

    I currently have an 850W PSU for my rig, but after finding on the energy reader I dont ever use more than around 220Watts when playing intensive games, I'm actually going to downgrade to a 300-350Watt PSU as it's more energy efficient.

    Hope This Helps
  4. sg4rb0 said:
    Hi, I recently did some testing with an energy reader for my gaming rig, and found it doesn't use more than 220W during intensive gaming (see this link http://www.tomshardware.co.uk/forum/id-2158335/power-consumption-results.html). Apparently your CPU uses slightly less power that mine according to this link http://www.bit-tech.net/hardware/2013/06/12/intel-core-i5-4670k-haswell-cpu-review/6. Also your graphics card appears to use between 2-2.5x more power (peaks about 350watts according to this link http://www.tomshardware.com/reviews/radeon-r9-290-and-290x,3728-4.html). All in all the 750watt will be more than enough unless you want 2 gfx cards instead of 1. You won't agree with me, but you could probably push that system you described all the way down to a 600W psu and it would have around 80-100Watts spare.

    I currently have an 850W PSU for my rig, but after finding on the energy reader I dont ever use more than around 220Watts when playing intensive games, I'm actually going to downgrade to a 300-350Watt PSU as it's more energy efficient.

    Hope This Helps


    Hi! I think I'll stick with the Seasonic M12II-850. I guess it is too much according to your tests, but spending Php 750/Less than $20 more than the 750w one is a pretty good deal. Plus I might even be able to add another GPU!

    Thanks for the answer! :DD
  5. RogueWave2 said:
    sg4rb0 said:
    Hi, I recently did some testing with an energy reader for my gaming rig, and found it doesn't use more than 220W during intensive gaming (see this link http://www.tomshardware.co.uk/forum/id-2158335/power-consumption-results.html). Apparently your CPU uses slightly less power that mine according to this link http://www.bit-tech.net/hardware/2013/06/12/intel-core-i5-4670k-haswell-cpu-review/6. Also your graphics card appears to use between 2-2.5x more power (peaks about 350watts according to this link http://www.tomshardware.com/reviews/radeon-r9-290-and-290x,3728-4.html). All in all the 750watt will be more than enough unless you want 2 gfx cards instead of 1. You won't agree with me, but you could probably push that system you described all the way down to a 600W psu and it would have around 80-100Watts spare.

    I currently have an 850W PSU for my rig, but after finding on the energy reader I dont ever use more than around 220Watts when playing intensive games, I'm actually going to downgrade to a 300-350Watt PSU as it's more energy efficient.

    Hope This Helps


    Hi! I think I'll stick with the Seasonic M12II-850. I guess it is too much according to your tests, but spending Php 750/Less than $20 more than the 750w one is a pretty good deal. Plus I might even be able to add another GPU!

    Thanks for the answer! :DD


    upto you fella :) That Brzone PSU runs at its best efficiency (85% efficient) when it is 50% load anyway. So that's not far off what you will be using.
  6. -Seasonic X-850 850W (80+ Gold)= Php 8,000.00
  7. Just unplug it at night to conserve energy and since the power supply is constantly drawing a bit of power as well and the UPS draws a lot of power to keep the backup battery charged completely.
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