Seasonic X Series 750W Review @ [H]

[Zero82z]

http://www.hardocp.com/article/2009/09/25/seasonic_x_series_x750_power_supply_review

Yes, it's amazing.

[Spectre]

It was indeed an interesting unit. Short deadline though ...phew.

[Stefan Payne]

hm, nice unit especialy 'cause it's completly different to everything else...

€dit:
Hm, dies anyone know the siwchingfrequency of this unit?

[davidhammock200]

It was indeed an interesting unit. Short deadline though ...phew.The lack of guts had me concerned, but the results speak for themselves. I am so very happy that you were able to add the transient response testing, that certainly makes your reviews a "must read" for me!

Excellent Job!
Dave:beer:

[Hondacity]

awesome numbers...

the internals look sweet...first time i've seen that design...

[Travis]

Seasonic X Series is based on the very same LLC-HB resonant topology (but the PWM controller is moved to the secondary side) plus Sychronous Rectification plus DC to DC conversion design, on which SST-ST70EF and BFG EX1000/1200 are both built. But the results are completely two different worlds. I MUST say the result tells the difference between manufacturer's engineering talents.

Before M12D appeared, there had been a fairly long blanking period when Seasonic was unable to bring about any 80Plus Silver or even Bronze unit. The reason is that they were hugely revamping their topology from conventional double-forward to some other designs during that time. While double-forward is proved competent for 80Plus Silver, Gold (or even Platinium) requirements, LLC finally stands out. It's far from being the perfect solution for efficient computer power supplies, but it has its own advantages.

[Stefan Payne]

What do you mean with LLC??

[ef3393]

the soldring job looks nice maybe better than Signature
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[Spectre]

The lack of guts had me concerned, but the results speak for themselves. I am so very happy that you were able to add the transient response testing, that certainly makes your reviews a "must read" for me!

Excellent Job!
Dave:beer:

That was a bit over two years ago ;)

[Spectre]

Seasonic X Series is based on the very same LLC-HB resonant topology (but the PWM controller is moved to the secondary side) plus Sychronous Rectification plus DC to DC conversion design, on which SST-ST70EF and BFG EX1000/1200 are both built. But the results are completely two different worlds. I MUST say the result tells the difference between manufacturer's engineering talents.

Before M12D appeared, there had been a fairly long blanking period when Seasonic was unable to bring about any 80Plus Silver or even Bronze unit. The reason is that they were hugely revamping their topology from conventional double-forward to some other designs during that time. While double-forward is proved competent for 80Plus Silver, Gold (or even Platinium) requirements, LLC finally stands out. It's far from being the perfect solution for efficient computer power supplies, but it has its own advantages.

I don't know. I would say Seasonic is pretty close to having be the ideal current solution. Changing the layout and the PCB arrangement was also a huge advantage to the way they designed this unit over their older double forward indy units and the other resonant synch DC-DC designs. =

[Travis]

The layout itself is a huge innovation and can be used with some other topologies like the conventional double-forward :)
With less hardwired cables the soldering joints on PCB are much cleaner too.

Resonant topology has its own weakness. It's ideal for fairly constant load and not quite high current usage, which high-end PCs are not.
As you have seen, Seasonic has done a great job here so its weak point turned to be a satisfactory.
btw: A power supply doesn't always need a large output choke to reduce ripple.

[ef3393]

Seasonic should improve dynamic load performance and add remote senser on all outputs (including 12V) to make this unit better
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[Zero82z]

Seasonic should improve dynamic load performance and add remote senser on all outputs (including 12V) to make this unit better
What's wrong with the dynamic performance of this unit?

[Travis]

What's wrong with the dynamic performance of this unit?


Compare the 12V rail performance of X-750 (based on an LLC-resonant voltage-mode controlled FM topology) to that of Silencer 750 Quad-CF (which is based on a double-forward current-mode controlled PWM topology, significantly faster), the voltage drop and voltage overshoot of former are about 1.7 times larger than latter, and the recovery time is ~1.4ms vs. <0.5ms, despite the help of a huge number of low-ESR solid caps. The loop just acts slowly.

[davidhammock200]

That was a bit over two years ago ;)I know, I'm making a less than subtle hint.:lol:

[RSC]

Now that i've bought the XFX 850w, Seasonic goes and launches this beauty...

F@#$...

[HOOfan_1]

Now that i've bought the XFX 850w, Seasonic goes and launches this beauty...

F@#$...

You got 100W more for the same price...what's the problem?

[RSC]

You got 100W more for the same price...what's the problem?

The X-750 is even more silent... ;)

[Zero82z]

The X-750 is even more silent... ;)
I doubt you'd hear either one.

[HOOfan_1]

The X-750 is even more silent... ;)

I haven't seen a definitive sound comparison test on either of them.

What setup are you planning to run with the XFX?

As Zero pointed out, you would doubtfully hear either one. For a system that would actually require that much power, the videocard fans would likely drown out everything else, if you watercool, your radiator fans would likely drown it out. For a system that doesn't require that much power, the PSU fans likely won't ramp up that much.

[Travis]

I haven't seen a definitive sound comparison test on either of them.

It uses a SanAce fan. It's passively cooled under ~200W load in 45c ambient.