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Seasonic Prime Titanium 650W PSU Review

Seasonic jumps onto the 80 PLUS Titanium wagon with three new units that belong to its Prime family. The 650 W model is under our scope today. Besides high efficiency, it also offers great performance, quiet operation, and nice looks.

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the SSR-650TD's rails. The limits, according to the ATX specification, are 120 mV (+12V) and 50 mV (5V, 3.3V and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load7.1 mV5.0 mV6.1 mV3.5 mVPass
20% Load9.2 mV5.4 mV6.1 mV3.8 mVPass
30% Load10.0 mV5.5 mV6.7 mV4.2 mVPass
40% Load10.1 mV5.5 mV6.8 mV3.7 mVPass
50% Load10.2 mV5.6 mV6.6 mV3.7 mVPass
60% Load10.6 mV5.6 mV6.9 mV4.1 mVPass
70% Load9.5 mV6.2 mV7.8 mV4.6 mVPass
80% Load9.9 mV7.4 mV8.3 mV5.4 mVPass
90% Load10.6 mV7.7 mV10.5 mV5.6 mVPass
100% Load12.2 mV8.0 mV11.7 mV6.2 mVPass
110% Load13.3 mV8.0 mV11.9 mV7.1 mVPass
Cross-Load 18.9 mV6.8 mV8.2 mV3.9 mVPass
Cross-Load 211.9 mV7.1 mV11.3 mV5.3 mVPass
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Ripple suppression is amazing, and made more impressive by the fact that this performance is achieved without any extra filtering caps on the modular cables. Seasonic's engineers did wonders with this platform, proving that they're able to offer ripple-proof designs.

Ripple Oscilloscope Screenshots

The following oscilloscope screenshots illustrate the AC ripple and noise registered on the main rails (+12V, 5V, 3.3V and 5VSB). The bigger the fluctuations on the screen, the bigger the ripple/noise. We set 0.01 V/Div (each vertical division/box equals 0.01 V) as the standard for all measurements.

Ripple At Full Load

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Ripple At 110-Percent Load

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Ripple At Cross-Load 1

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Ripple At Cross-Load 2

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Aris Mpitziopoulos
Aris Mpitziopoulos

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