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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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  • bharatwd
    60 Ampere of inrush current is too high for 230 V countries. Wont that damage the other parts in the pc?
    Reply
  • Aris_Mp
    It won't damage anything in the PC since it doesn't have to do anything with the PSU's secondary side. High inrush currents apply stress to the electrical infrastructure (switches, relays etc.)
    Reply
  • bharatwd
    Hi Aris, thanks for the reply..............So it will basically hurt the PSU components itself?
    Reply
  • josejones
    "Haswell Ready" ??? How about SkyLake or the soon to be released KabyLake ready?
    Reply
  • turkey3_scratch
    My mind is blown. This is a great unit and I'm happy to see the transient response performance was good. HardOCP's testing on one of the Prime Titanium units shows not-so-good transient response performance.

    Whoops accidental upvote above.
    Reply
  • Aris_Mp
    Nope it won't hurt the PSU, just the breakers and electrical circuits before it will be stressed a bit.

    Haswell ready: I was thinking to change this to S6/S7 compatible. Probably the time has come for this to happen.
    Reply
  • bharatwd
    Thanks for the reply Aris........10 years warranty will be fun if the current inrush is at 60+ Ampere :) especially in India :)
    Reply
  • Virtual_Singularity
    Excellent review. Impressive work/effort by Seasonic as well. Curious to see how the other units in this new line stack up to this one. Haven't seen HOCP's review yet, but there has been some variance in others, but still seems like a solid effort on Seasonic's part.

    With no capacitors in the cables, can't see a reason not to flatten the atx connector as well. I guess the sleeved atx connect look has become somewhat traditional. Not a criticism by any means, just saying.
    Reply
  • turkey3_scratch
    18563170 said:
    Excellent review. Impressive work/effort by Seasonic as well. Curious to see how the other units in this new line stack up to this one. Haven't seen HOCP's review yet, but there has been some variance in others, but still seems like a solid effort on Seasonic's part.

    With no capacitors in the cables, can't see a reason not to flatten the atx connector as well. I guess the sleeved atx connect look has become somewhat traditional. Not a criticism by any means, just saying.

    On Jonnyguru Oklahomawolf likes the ATX cable to be sleeved and the others to be ribbon; this is because 24 wires can sometimes become difficult to manage in ribbon style versus sleeved. That's just his thinking at least, and I sort of understand where he comes from with that. If it's ribbon style that also makes it an extremely wide cable, whereas if it is sleeved it's more narrow for better cable routing and then widens up at the end.
    Reply
  • JackNaylorPE
    I find round sleeved cables much more difficult to manage, and the reason why many builders sleeve there own cables or use extensions. OTOH, the plain flat cables are just fugly, you can get the best of both worlds with flat, individually sleeved cables. Individually sleveed cables, with cable combs, offer the optimal combination of aesthetic choice and easier cable routing.


    I don't really understand the big "ooh wow" about Titanium rates PSUs; all it is is a "green" energy consumption rating and unless you pay well above the average US utility costs, you'll never get a positive ROI. What I don't understand is why "PSUs and cables" aren't offered as a "bundle". I hate paying a quality set of cable and then leaving them in a box. I'd like to see some PSU manufacturer "step up" and and say offer every PSU with a $xx coupon for a set of cables. The value of the coupon would cover the basic cable set so it would essentially come free with the PSU. OTOH, if you wanted to move up to a, individually sleeved set, you would only have to pay the difference between the base set and the set of your choice

    http://www.frozencpu.com/products/18823/psu-cab-50/Corsair_Professional_Series_Individually_Sleeved_DC_Modular_Cable_Kit_Type_3_Generation_2_-_White_CP-8920050.html?tl=g2c413s1599
    Reply