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Is my psu wattage enough?

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Posted · Original PosterOP

Yesterday I've tested an old motherboard that I want to borrow to a friend because his computer sucks. I've hooked up a be-quiet 600w psu to an overclocked i5-750 @ 3,6ghz and I tested some games with 8gb ram (4x2gb) and my old r9 290x


Everything worked and I was ready to tell him that everything worked fine, until I used some "psu wattage calculators" online. Apparently 600w is not enough for this system configuration to run properly, I should go for a 650w power supply. 


Now, those parts would be given for free to him so he can't really complain, but I don't want his computer to die mid gaming session because the psu is weak. 


What do you guys think? 

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3 minutes ago, Raptor_Fawr said:

What do you guys think? 

it's fine

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Products I like:


Sony Xperia Z1 / Z2 / 10 ii, Asus Strix 970 / 1070, Samsung SSD, WD HDD, Corsair PSUs (AX, RM, CX(grey)), GeForce GPU, NZXT N450/S340, be quiet! Coolers, G.Skill Trident RAM, Logitech M525, Logitech G440, Razer Deathadder Elite


Products I hate:


Xperia Z3, XiaoMi 5c, Radeon GPUs, Razer Audio Products, any bloatwares


Companies I absolutely adore: (and hope it stays that way)


be quiet! - sent me AM4 mounting for my DRP3 even though it's way past the timeframe stated, no questions asked

Corsair - very good RMA experience, absolutely recommend


Companies I hate:


Nvidia, Intel, Apple, TMT (Thundermatch, a retailer)


Personal Blacklisted Companies:


Acer monitors, Gigabyte, Seagate HDD, Kingston SSD, Razer (except their mouse), XiaoMi Phones


Remember, just because I had good/bad experiences with these companies/product, doesn't mean you will have similar experiences too. I would still recommend these products if they made sense for your needs, but I'll add a disclaimer of my experience if it's relevant. Feel free to DM me asking why they are where they are.



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1 hour ago, Raptor_Fawr said:

Apparently 600w is not enough for this system configuration to run properly,

wattage calculators are just bs, don't use them. 

wattage wise it should be fine, though what specific model? 

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30 minutes ago, Raptor_Fawr said:

What do you guys think? 

To get a rough impression of how much power your PC will need under FULL load you can add up all the TDPs of your components. f.e.:

- i5-750: 95W (OC'ed more like 120-140W)

- r9 290x: 250W

- Mobo and RAM don't need much power. I just calculate with roughly 10-20% of what the CPU needs: ~25W (for both together)


So all in all with that configuration you probably only need around 400W maybe 450W maximum. That is if CPU and GPU both were at 100% load.


Those are only rough guidelines but in my experience they work pretty good.

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Posted · Original PosterOP

Thanks to all of you, I feel relieved then. TofuHaroto asked for the specific model but I am not aware right now, it's from be quiet and it's pretty recent I bought it on amazon this year because I needed a spare psu for component testing 

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