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[Amazon.ca] CoolerMaster MasterWatt 550W 80+ Bronze Semi-Modular PSU $60

[OP]
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Dec 8, 2019
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[Amazon.ca] CoolerMaster MasterWatt 550W 80+ Bronze Semi-Modular PSU $60

Found this while poking around online today. Sold & Shipped by Amazon, close to ATL ($58 back in 2018) according to CCC and PCPartPicker.

There seems to be some concerns about cap quality and coil whine on this model, but looks like a decent entry-level PSU otherwise (Tier C on the LTT Tier List).
It's nice to have modularity at this price point.
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nice!
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This will go well with the rtx 3080 i just added to my cart... oh no where did it go?!? Noooooooooooo...
.
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Sep 7, 2014
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Gud Ol' Ontariuh Boy
Modular - check
Reliable brand - check
$60 - check

I'd say it's a solid deal definitely if you're in the market for one...especially right now!
shabby wrote: This will go well with the rtx 3080 i just added to my cart... oh no where did it go?!? Noooooooooooo...
Lol I know you're kidding, but pretty sure a 3080 eats up about 350W alone, so I would NOT recommend pairing it with a 550W PSU, my man.
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Oct 9, 2014
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YEG, YXE, YYZ
Yeah definitely a good price but for those building with a 3060 TI, a 600W PSU is recommended.
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ChippewaBarr wrote: Modular - check
Reliable brand - check
$60 - check

I'd say it's a solid deal definitely if you're in the market for one...especially right now!


Lol I know you're kidding, but pretty sure a 3080 eats up about 350W alone, so I would NOT recommend pairing it with a 550W PSU, my man.
Looks like all 550W can be delivered on the 12V so it might be possible to run a 3080 along with a low power cpu.
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Oct 13, 2018
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PerformingAzura wrote: Looks like all 550W can be delivered on the 12V so it might be possible to run a 3080 along with a low power cpu.
This thing is a double forward unit, it'll WHINE on a 3080. I would not put a 3080 anywhere near this. Get something like the Rosewill Capstone Newegg has on sale or at least an EVGA B5/Corsair CX-F.
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Nov 17, 2014
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Toronto, ON
I ordered the 750 watt version of this, twice.
They have failed to deliver both to me. over 2 weeks.
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Apr 13, 2017
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I had this same unit. I upgraded to a rx 580 and this unit started getting massive coil whine. Coolermaster basically said that's normal and doesn't warrant a repair/replacement.
Sold the unit and got a corsair instead
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Can't go wrong at this price! Make sure your rig needs 550 though, maybe you need more for a hungry GPU + CPU set up
Last edited by radeonboy on Apr 6th, 2021 9:42 pm, edited 1 time in total.
Jr. Member
Aug 13, 2019
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ChippewaBarr wrote: Modular - check
Reliable brand - check
$60 - check

I'd say it's a solid deal definitely if you're in the market for one...especially right now!


Lol I know you're kidding, but pretty sure a 3080 eats up about 350W alone, so I would NOT recommend pairing it with a 550W PSU, my man.
550W is fine for a 3080. I've been running a 3x RTX 3070 build running 24/7 @ 100% load on a 750W for months now.
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Redcontrollers wrote: 550W is fine for a 3080. I've been running a 3x RTX 3070 build running 24/7 @ 100% load on a 750W for months now.
Depends on the load, gaming = no, mining yes.
.
[OP]
Jr. Member
Dec 8, 2019
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Canada Computers has the EVGA B5 550W on sale for the same price right now. It's fully modular, and reviews seems to suggest it's a better PSU than this one.
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Mar 5, 2013
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Kitchener
Redcontrollers wrote: 550W is fine for a 3080. I've been running a 3x RTX 3070 build running 24/7 @ 100% load on a 750W for months now.
For anyone reading...definitely varies from system to system....I run a single 3080 TUF OC at 110% power + Threadripper 2920X, during Warzone for example my system peaks at 590W, I use a 1000w Corsair HX1000i 80+ Platinum. I had a 80+ Bronze 750W when I had my 5700 XT. It would only give me 750W*82% efficient at 100% load = 615W, 25W of headroom if I kept using it with the 3080. That's a dangerous game to play. VS my 1000w is 1000w*89% at 100% load = 890W, 300W of headroom.
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The Seasonic Focus gold 650w was 70$ a couple of weeks ago. I’d wait for such a sale
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Oct 22, 2013
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NORTH YORK
RainDown wrote: For anyone reading...definitely varies from system to system....I run a single 3080 TUF OC at 110% power + Threadripper 2920X, during Warzone for example my system peaks at 590W, I use a 1000w Corsair HX1000i 80+ Platinum. I had a 80+ Bronze 750W when I had my 5700 XT. It would only give me 750W*82% efficient at 100% load = 615W, 25W of headroom if I kept using it with the 3080. That's a dangerous game to play. VS my 1000w is 1000w*89% at 100% load = 890W, 300W of headroom.
isn't it 750/82%? .correct me if I'm wrong.
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Aug 3, 2019
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kevinkuo wrote: Canada Computers has the EVGA B5 550W on sale for the same price right now. It's fully modular, and reviews seems to suggest it's a better PSU than this one.
I would definitely go for EVGA, i have had bad experiences with both coolermaster and thermaltake for PSU. They both ended up making whining noise after some time. For me its either corsair or evga.
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I'm running Coolmaster 500W RS-500-ACAA-B1 PSU (bought for $49.97+taxes in 2015) for my AMD FX 6300 3.5GHz CPU on an Asus M5A97 LE R2.0 mobo with 16GB RAM ... Windows 7 Ultimate.

No issues.
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Kitchener
IKnowUSexy wrote: isn't it 750/82%? .correct me if I'm wrong.
A 750W 80 Bronze+ rated power supply can take in a maximum 750W, but it is only 82% efficient at outputting that wattage, at 100% load. So 82% of 750W is 615W. Hence the bronze rating. If we did what you're saying 750W/82% that would be 914W, which doesn't make sense
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RainDown wrote: A 750W 80 Bronze+ rated power supply can take in a maximum 750W, but it is only 82% efficient at outputting that wattage, at 100% load. So 82% of 750W is 615W. Hence the bronze rating. If we did what you're saying 750W/82% that would be 914W, which doesn't make sense
914 is power pull from wall.The PSU is rated in DC power, meaning that a 750w PSU will supply up to 750w of power on the DC side.

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