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Thermaltake Smart BM2 750W Power Supply Review

The Smart BM2 750W is a worth considering mid-level power supply from Thermaltake.

Thermaltake Smart BM2 750W
(Image: © Tom's Hardware)

Our Verdict

A decent offering from Thermaltake, which achieves high-performance levels in this category.

For

  • Full power at 41 degrees Celsius
  • High enough overall performance
  • Good efficiency for this category
  • Tight load regulation on the minor rails
  • Efficient 5VSB rail
  • Alternative Sleep Mode compatibility
  • Ideal distance between the peripheral connectors

Against

  • Not so good transient response
  • Low hold-up time
  • Noisy under high loads
  • High inrush current with 230V input
  • Both EPS connectors on the same cable

Thermaltake's Smart BM2 750W model, offers high performance among affordable 750W power supplies. The company chose Channel Well Technology's platform to build upon. The semi-modular cable interface will help during the PSU installation, and the fact that this unit achieves Silver in the Cybenetics efficiency rating system shows its platform's capabilities. Its major opponents are the Corsair CX750 and CX750M, the new XPG Pylon with similar capacity, and the Cooler Master MWE Bronze 750. 

Thermaltake's Smart BM2 line consists of four models with capacities ranging from 450W to 750W. The 750W unit we're focusing on achieves Bronze on 80 Plus' scale and Silver in Cybenetics. The output noise is increased, though, achieving Standard+, which means above 35 dBA overall noise output.

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Thermaltake Smart BM2 750W

(Image credit: Tom's Hardware)

Product Photos

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Thermaltake Smart BM2 750W

(Image credit: Tom's Hardware)
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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake equipped this PSU with a rifle bearing fan to survive the five-year warranty. The external design looks nice, thanks to the punched fan grille, though it looks restrictive. Considering that this is not a Gold or Platinum PSU, the fan grille should be less restrictive to allow for higher airflow. Lastly, the PSU's modular panel only includes six sockets since the 24-pin and a pair of EPS connectors are installed on fixed cables.  

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Cooler Master V850 V2 Gold

(Image credit: Tom's Hardware)

Product Photos

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Thermaltake Smart BM2 750W

(Image credit: Tom's Hardware)
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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Specifications

Manufacturer (OEM)

CWT

Max. DC Output

750W

Efficiency

80 PLUS Bronze, Cybenetics Silver (85-87%)

Noise

Cybenetics Standard + (35-40 dB[A])

Modular

✓ (Semi)

Intel C6/C7 Power State Support

Operating Temperature (Continuous Full Load)

0 - 40°C

Over Voltage Protection

Under Voltage Protection

Over Power Protection

Over Current (+12V) Protection

Over Temperature Protection

Short Circuit Protection

Surge Protection

Inrush Current Protection

Fan Failure Protection

No Load Operation

Cooling

140mm Rifle Bearing Fan (TT-1425 DF1402512SEMN)
Semi-Passive Operation
Dimensions (W x H x D) 150 x 85 x 160mm

Weight

1.7 kg (3.75 lb)

Form Factor

ATX12V v2.52, EPS 2.92

Warranty

5 Years

Power Specifications

Rail3.3V5V12V5VSB-12V
Max. PowerAmps202062.52.50.3
Watts12075012.53.6
Total Max. Power (W)750

Cables & Connectors

Native Cables
DescriptionCable CountConnector Count (Total)GaugeIn Cable Caps
ATX connector 20+4 pin (600mm)1118AWGNo
8 pin EPS12V (660mm) / 4+4 pin EPS12V (150mm)11 / 118AWGNo
Modular Cables
6+2 pin PCIe (500mm+150mm)2418AWGNo
SATA (500mm+150mm+150mm)3918AWGNo
4-pin Molex (500mm+150mm+150mm+150mm) / FDD (+150mm)14 / 118-20AWGNo
AC Power Cord (1380mm) - C13 coupler1118AWG-

The ATX and EPS cables are fixed, but all of the other cables are modular. Our only objection here is that both EPS connectors are on the same cable, so you cannot fully utilize them. On the other hand, someone could argue here that this PSU won't be used with energy-hungry CPUs. 

All of the cables are long and it is good to see an adequate distance between the peripheral connectors. Lastly, there are no in-cable caps, and the flat, fixed and modular cables will block less airflow inside the chassis.

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Thermaltake Smart BM2 750W

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Cable Photos

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Component Analysis

We strongly encourage you to have a look at our PSUs 101 article, which provides valuable information about PSUs and their operation, allowing you to better understand the components we're about to discuss.

General Information-
Manufacturer (OEM)CWT
PCB TypeSingle Sided
Primary Side-
Transient Filter4x Y caps, 2x X caps, 2x CM chokes, 1x MOV, 1x Power Integrations CAP200DG (Discharge IC)
Inrush ProtectionNTC Thermistor SCK-1R55 (1.5 Ohm)
Bridge Rectifier(s)1x GBU1506 (600V, 15A @ 100°C)
APFC MOSFETs2x Great Power GP28S50G (500V, 28A, Rds(on): 0.125Ohm)
APFC Boost Diode1x ON Semiconductor FFSP0665A (650V, 6A @ 153°C)
Bulk Cap(s)1x Nichicon (420V, 390uF, 2,000h @ 105°C, GG)
Main Switchers2x Great Power GP23S60HX
PFC / PWM Combo ControllerChampion CM6800TX & Champion CM03X
TopologyPrimary side: APFC, Double Forward
Secondary side: Semi - Synchronous Rectification (12V) & DC-DC converters (5V & 3.3V)
Secondary Side-
+12V2x Advanced Power AP6N3R5P (60V, 80A @ 100°C, Rds(on): 3.58mOhm) FETs & 2x PFC PFR40V60CT (60V, 40A @ 100°C) SBRs
Driver ICSyncPower SP6019
5V & 3.3VDC-DC Converters: 4x Sync Power SPN3006 (30V, 57A @ 100°C, Rds(on): 5.5mOhm)
PWM Controllers: ANPEC APW7159C
Filtering CapacitorsElectrolytic: 2x CapXon (2-5,000h @ 105°C, KF), 6x CapXon (2-5,000h @ 105°C, GF), 10x Chengx (2-4,000h @ 105°C, GR), 1x CapXon (5-10,000h @ 105°C, KH)
Polymer: 2x APAQ
Supervisor ICIN1S429I-DCG
Fan ModelThermaltake TT-1425 (DF1402512SEHN) (140mm, 12V, 0.60A, Rifle Bearing Fan)?
5VSB Circuit-
Standby PWM ControllerPower Integrations TNY287PG
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Thermaltake Smart BM2 750W

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Overall Photos

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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This is CWT's CSB platform, which uses a double forward topology on the primary side and a semi-synchronous rectification on the secondary side. The minor rails are generated through a pair of DC-DC converters. The caps on the secondary side don't belong to top-notch manufacturers. We would prefer to see Teapo (not the SC line) or Elite caps, but this period there is not enough stock to cover every OEM, so most manufacturers have to use other, less-known cap brands.

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Thermaltake Smart BM2 750W

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Transient filter

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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The EMI filter has all of the required components, including a discharge IC and an MOV to protect against voltage surges. This filter does a good job, according to our EMI test results. 

Thermaltake Smart BM2 750W

(Image credit: Tom's Hardware)

There is an NTC thermistor to handle inrush currents. It isn't supported by a bypass relay and to make matters worse, it has low resistance to do a good job, so inrush currents are quite high, especially with 230V input. 

Thermaltake Smart BM2 750W

(Image credit: Tom's Hardware)

The single bridge rectifier is bolted on a heat sink. We had to detach it to identify it. It can deliver up to 15 Amperes at 100 degrees Celsius, so it will handle the energy requirements of this power supply. 

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Thermaltake Smart BM2 750W

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APFC converter

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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The APFC converter uses a pair of Great Power FETs and a single boost diode. The bulk cap is by Nichicon and its capacity is low, for a 750W power supply. Lastly, the combo PFC/PWM controller is the legendary Champion CM6800, which was widely used a few years ago. It is supported by a CM03X IC. 

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Thermaltake Smart BM2 750W

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Main FETs and primary transformer

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Thermaltake Smart BM2 750W

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The pair of main FETs is installed into a half-bridge topology. 

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Thermaltake Smart BM2 750W

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12V FETs and VRMs

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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The 12V rail is regulated by two pairs of FETs and SBRs. This way efficiency takes a hit, but the cost is lower. The minor rails, are generated through a couple of DC-DC converters. 

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Thermaltake Smart BM2 750W

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Filtering caps

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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The electrolytic filtering caps are provided by CapXon and ChengX. Although their specs are good, on paper at least, still we would like to see higher quality caps. Nonetheless, there is a big shortage on Teapo and Elite caps because of the increased demand, so OEMs have to use other cap brands to continue production. 

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Thermaltake Smart BM2 750W

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5VSB circuit

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Thermaltake Smart BM2 750W

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A Power Integrations TNY287PG is the standby circuit's PWM controller. 

Thermaltake Smart BM2 750W

(Image credit: Tom's Hardware)

The supervisor IC is an IN1S429I-DCG, but no further information seems to be available about it other than a model name.

Thermaltake Smart BM2 750W

(Image credit: Tom's Hardware)

The small modular board is connected to the main PCB through several thick power cables. 

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Thermaltake Smart BM2 750W

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Soldering quality

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Thermaltake Smart BM2 750W

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Thermaltake Smart BM2 750W

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Soldering quality is acceptable. Definitely not the best we have seen by CWT, but this is an affordable platform.

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Thermaltake Smart BM2 750W

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Cooling fan

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Thermaltake Smart BM2 750W

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The cooling fan uses a rifle bearing, according to Thermaltake and I don't have a reason not to believe it, since the provided warranty is long at five-years. Most plain sleeve bearing fans won't live as long. 

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