ASUS VivoBook S14/S15

Power supplies are one of the most neglected components in PC builds. To the eyes of a consumer, any brand with the appropriate wattage will do. However, there are a few other factors that affect system builders and enthusiasts. Wattage, efficiency, cables & its modularity, the fan, price, and even the aesthetics dictate a power user’s choice for a power supply. Today, we have the Cooler Master MasterWatt 750 – a semi-modular power supply with 80 PLUS Bronze certification.

Special thanks to Cooler Master for letting us explore the MasterWatt 750!

Unboxing

Cooler Master has redesigned their packaging countless times over the years – and this time around with the Master-prefix branding, Cooler Master opted for a muted color scheme with cyan and white colored texts.

Cooler Master MasterWatt 750

Behind the box is where Cooler Master kept everything nice and short with only two sentences describing the fan curve and also the voltage stability feature with a DC-DC topology.

Cooler Master MasterWatt 750

At the side is the full list of specs for the Cooler Master MasterWatt 750, which can deliver a total of 750W on the 12V rail.

On the other side of the box tells the types of connectors and how many of them are available.

Cooler Master MasterWatt 750

The box opens on the right side. Pretty fancy and unconventional for these type of packaging, I’d say.

Cooler Master MasterWatt 750

Opening up the Cooler Master MasterBox 750 reveals a user manual at the top, together with all of the modular cables stuffed together with a standard UK wall plug.

Cooler Master MasterWatt 750

The Cooler Master MasterBox 750 itself is wrapped in some type of air cushion bag. The power supply fits in snugly and has ample of protection from all sides.

Cooler Master MasterWatt 750

Design

The Cooler Master MasterBox 750 takes on a black and white approach with a minimal amount of stickers. Better yet if the power supply is mounted to have the fan facing downwards – then only the sticker with the words “Cooler Master MasterWatt 750” are showing. Personally, I’m really liking this minimalist design

Cooler Master MasterWatt 750

At the back is where the typical honeycomb design for exhaust is found. Cooler Master manages to fit in their logo around the power jack and switch area too.

Cooler Master MasterWatt 750

In terms of cables, the Cooler Master opted for flat black ribbon cables for the MasterWatt 750. This type of cable is thin and flat, which has a very minimalist look overall. However, bending these cables around tight corners will be a challenge.

Cooler Master MasterWatt 750

The MasterWatt 750 offers a total of 5 slots to plug in all the modular cables. Cooler Master opted for minimalist labels and just labeled these slots as “8-pin PCIe” and “5-pin HDD/SATA”. Not a big deal, but it’s obvious that Cooler Master is going for a minimalist design language for the MasterWatt 750.

Cooler Master MasterWatt 750

On the other side of the power supply is where the sticker with the list of specs is found.

Cooler Master MasterWatt 750

The cables near the connector part are a little jarring as cables are crossing from one end to another before flattening.

Cooler Master MasterWatt 750

Specifications

Product Name MasterWatt 750
Product Number MPX-7501-AMAAB
Type ATX 12V V2.4
PFC Active PFC
Operation Voltage 100-240 Vac
Input Voltage 100-240 Vac
Input Current 10-5 A
Input Frequency 50-60 Hz
Dimensions (LxBxH) 140 x 150 x 86 mm
Fan Size 120 mm
Fan Bearing LDB
Power Good Signal 100-500 ms
Hold Up Time 16ms at 80% load
Efficiency 85% @ Typical Load
ErP 2013 Lot 6 Yes
MTBF >100,000 hours
Operating Temperature 0 ~ 40°C
Protections OCP / OVP / UVP / OPP / OTP / SCP
Regulatory CCC, CE, TUV-RH, RCM, EAC, cTUVus, FCC, BSMI, KC, CB
Connectors MB 24 Pin 1
CPU 12V 4+4 Pin 1
SATA 9
Peripheral 4 Pin 3
FDD Cable 4 Pin 1
PCI-e 6+2 Pin 4

Cable Management

Cooler Master MasterWatt 750

It’s interesting to see that Cooler Master opted to sleeve the 24-pin ATX cables in a bundle together, even though it’s flat. We have power supplies like the SilverStone ET650-B which opted to maintain the flat ribbon cable, but split up the 24 cables’ width in half. As for whichever is better, I prefer Cooler Master’s approach as it is easier to bend from behind the motherboard tray to the front.

Cooler Master MasterWatt 750

In terms of cable lengths, the MasterWatt 750 can accommodate for any mid-tower cases without issues.

Cooler Master MasterWatt 750

We tried it on the COSMOS C700P with rotated motherboard orientation, and there were no major issues other than the 24-pin ATX connector’s length when the motherboard’s rear I/O is pointing downwards.

Cooler Master MasterWatt 750

As it is a semi-modular power supply, cable management is indeed easy. As always, bending the cables around corners might be an issue as it requires a specific way to bend the flat cables. Though, not having a case with a power supply shroud isn’t the end of the world since having less excess cable is a big boon.

Cooler Master MasterWatt 750
Pick and choose what you need.

User experience

We’re judging the MasterWatt 750 through our experience of building PCs throughout the years as we do not have the proper equipment to test the power supply scientifically.

Funny enough, I first hooked up the Cooler Master MasterWatt 750 to a Ryzen 3 1200 build that has a Noctua NH-U12S, two GeIL EVO X RAMs, a PenDrive M.2 SATA III SSD and an ASUS GTX750. I just start it up and to my surprise, the fan did not power up. Total silence!

Cooler Master MasterWatt 750

If your system can have the fan be on idle for most of the time, that means there’s no dust going in the power supply, too. If there’s less dust, that means the cooling solution is working fine.

The entire system was overclocked as stated on our Ryzen 3 1200 review here, and yet the fan did not spin even under load. The power supply was totally silent not because the fan isn’t spinning at all, but because there were no coil whine too. The MasterWatt 750 performs well here.

Even when the fan kicked in, that Silencio fan wouldn’t create much noise anyway.

Wrapping up the Cooler Master MasterWatt 750 review

The MasterWatt 750 has an 80 PLUS Bronze certification and the fan won’t start until it’s under 15% of load. That’s a huge boon for those who always leave their computer in idle. Dusts won’t get sucked in and the system remains silent.

Cooler Master MasterWatt 750

Priced at RM389, the MasterWatt 750 is a pretty compelling option for those who wants silence, semi-modular and flat ribbon cables. And good looks too, if the power supply sticker is an issue for you.

There are other power ratings of the MasterWatt series of power supplies with the same features too, namely the MasterWatt 650 and MasterWatt 550, priced at RM339 and RM299 respectively.


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