Rosewill Capstone Modular 750 W

Rosewill Capstone Modular 750 W

Packaging, Contents & Exterior »

Specifications

Rosewill CAPSTONE-750-M Features & Specs
Max. DC Output750W
PFCActive PFC
Efficiency80 PLUS Gold
Operating temperature0°C - 50°C
ProtectionsOver Voltage Protection
Under Voltage Protection
Over Current Protection
Over Power Protection
Short Circuit Protection
Cooling140 mm Double Ball Bearing Fan
Dimensions150 mm (W) x 86 mm (H) x 163 mm (D)
Weight2.3 kg
ComplianceATX12V v2.31, EPS 2.92
Warranty5 years
Price at time of review (exc. VAT)$159.99 (MSRP)

Efficiency is 80 Plus Gold and the operating temperature range is pretty large since this unit can deliver its full continuous power up to 50°C. Normally in a PC chassis with good airflow the ambient won't exceed 35°C but especially PSUs require resilience to high operating temperatures (>40°C), which usually translates to higher reliability and better quality. When it comes to electronic components (e.g. capacitors) as their temperature rating increases, their quality and lifespan follows. Unfortunately components with higher temperature rating cost more and this is clearly seen in caps where the 105°C ones are more expensive than the corresponding with 85°C rating.
Although the PSU has 750W capacity with almost all of it being available at +12V alone, the manufacturer claims that it is equipped with OCP, a protection that is practically useless in a medium-high capacity single rail PSU. Well we will check on this once we take the unit fully apart. Regarding the rest of the characteristics, at a glance the fan has the usual 140mm diameter, the unit's dimensions are compact for its capacity and the warranty is set at five years. Finally the price looks a little stiff for a house brand PSU but do not forget that this unit has nothing to do with usual house brand products since it is made by one of the best PSU OEMs, Super Flower.

Rosewill CAPSTONE-750-M Power Specs
Rail3.3V5V12V5VSB-12V
Max. Power24A24A62A3A0.5A
120W744W15W6W
Total Max. Power750W

The minor rails are strong enough with 120W max combined power. After all, modern systems don't draw much power out of these two rails. On the contrary, the +12V rail is heavily utilized nowadays so in this case the manufacturer granted it with 62A capacity. Finally the 5VSB have sufficient power for the category that this unit belongs to.

Cables & Connectors, Power Distribution

Native Cables
ATX connector (565mm)20+4 pin
4+4 pin EPS12V/ATX12V (630mm)1
8 pin EPS12V (630mm)1
Modular Cables
6+2 pin PCIe (450mm+150mm)4
SATA (450mm+150mm+150mm+150mm)8
4 pin Molex (450mm+150mm+150mm)3
4 pin Molex (450mm+150mm) / FDD(+150mm)5 / 1

The PSU has three native cables including the main ATX connector and the two EPS ones. In our opinion the second EPS connector should be modular since most users will not utilize it. Overall the unit has a sufficient number of connectors for its capacity and the good thing is that both EPS along with the four PCIe connectors are available at the same time. Also all cables are long enough and the distance among connectors is the right one according to the ATX spec. Finally all wires have 18AWG size which is the recommended one. In a 750W capacity PSU it isn't necessary to utilize thicker wires, something that will have a negative impact on their flexibility, since current will not be high enough to cause significant voltage drops.

Since this PSU features a single +12V rail we do not have anything to comment about its power distribution.
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