NZXT C Series 650W Power Supply Review

A quiet power supply with a fair price.

(Image: © NZXT)

Why you can trust Tom's Hardware Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out more about how we test.

Performance Rating

(Image credit: Tom's Hardware)

The overall performance that the C650 achieves is close to the Seasonic Focus and Corsair RM models, but the RM650x, the XPG Reactor 650, and the EVGA 650 G3 are notably better. Nevertheless, the G3 has been already replaced by the inferior G5 line, so it won't be a threat anymore. 

Noise Rating

The graph below depicts the cooling fan's average noise over the PSU's operating range, with an ambient temperature between 30 to 32 degrees Celsius (86 to 89.6 degrees Fahrenheit).

(Image credit: Tom's Hardware)

The C650 manages to remain quiet even under harsh conditions (like high loads and increased operating temperatures). Still, the king of this category remains the dead silent Corsair RM650x. 

Efficiency Rating

The following graph shows the PSU's average efficiency throughout its operating range with an ambient temperature close to 30 degrees Celsius.

(Image credit: Tom's Hardware)

The C650 takes the lead here from its main opponent, the RM650x, but loses to almost all the other offerings in this category. With only exceptions, the first two units from EVGA and XPG, the differences are not so high. 

MORE: Best Power Supplies

MORE: How We Test Power Supplies

MORE: All Power Supply Content

Contributing Editor

Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.