Seasonic X Series: X-750 Power Supply Review @ [H]

FrgMstr

FrgMstr

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Seasonic X Series: X-750 Power Supply Review - Fully modular, 750 watts of computing power, high efficiency, and a great build quality has been done before in the world of PSUs, but never quite like this. Seasonic's X Series is an evolution in the world of power supplies.

The Bottom Line? The Bottom Line is that users should have but one question about the Seasonic X-750. Do I want ground or accelerated shipping on my order?
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Soo what magic fairy dust did they pump into this thing? I'm really surprised by how empty in the inside looks. no massive heatsinks, or components to the grill.

Those are insane numbers.
 
THIS is the kind of power supply I have been waiting to see built. With modern, high efficiency components available, this performance has been possible for some time, but until now no manufacturer has decided to make the investment into top-of-class design AND components like we see here. Because of their component selection, at a price point of $199 I doubt they are making any more than poorer-performing units that are sold at $140. I would expect this kind of performance on a $500 server class PSU (probably with more internal heatsinking) but to get it at this level and price point is outstanding.

Keep up the good work, I'll bet the next rev will have the slightly higher transient response ironed out, which as it exists isn't enough to cause stability problems anyway.
 
lol "masochist at heart", this is what I like to see about a good psu.
 
WOW. Me wants (but "only" the 650W version). Me and my supplier are both waiting for this PSU.

Btw Kyle, did Paul found out who stole the PSU ? :D
 
Sweet thanks for the review guys! If i wasn't looking to purchase a video card first this would be my next purchase. I guess second will have to do!
 
The only problem with this line of PSU is that they don't have lower models. Even 650W is a bit too much (especially with the 5870 idle power usage and Core i5 750 lower power requirements, my C2D 8400+HD4870 used 150W in idle which was at 24,2% of my HX620), but lower models would be superb - something like 550W would be awesome. I would even accept lower 80+ rating in exchange for silence of these PSU's. That is what attracts me to them.
 
faugusztin said:
The only problem with this line of PSU is that they don't have lower models. Even 650W is a bit too much (especially with the 5870 idle power usage and Core i5 750 lower power requirements, my C2D 8400+HD4870 used 150W in idle which was at 24,2% of my HX620), but lower models would be superb - something like 550W would be awesome. I would even accept lower 80+ rating in exchange for silence of these PSU's. That is what attracts me to them.
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The price would make them ridiculous at lower power levels.
 
faugusztin said:
The only problem with this line of PSU is that they don't have lower models. Even 650W is a bit too much (especially with the 5870 idle power usage and Core i5 750 lower power requirements, my C2D 8400+HD4870 used 150W in idle which was at 24,2% of my HX620), but lower models would be superb - something like 550W would be awesome. I would even accept lower 80+ rating in exchange for silence of these PSU's. That is what attracts me to them.
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Seasonic has plenty of great lower-wattage models. At lower power levels, differences in efficiency mean less since each percentage point translates to a much lower amount of overall power. A 90% efficient PSU is unnecessary.
 
I know they have lower wattage models, but the point was not on efficiency, but on the way it is cooled. I have silent PSUs since start (Seasonic 400-500W OEM, Corsair HX520/HX620, Enermax Modu82-425, soon probably also be quiet! dark power pro 450W), but because fans spin, they allways make a noise. No fan spin = no noise.
 
Wow, every other time I have seen a PSU that empty it was pretty much guaranteed to explode. :eek:
 
siliconnerd said:
Wow, every other time I have seen a PSU that empty it was pretty much guaranteed to explode. :eek:
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I thought the same thing. Good power supplies are usually heavy enough to flatten small woodland creatures.
 
faugusztin said:
The only problem with this line of PSU is that they don't have lower models. Even 650W is a bit too much (especially with the 5870 idle power usage and Core i5 750 lower power requirements, my C2D 8400+HD4870 used 150W in idle which was at 24,2% of my HX620), but lower models would be superb - something like 550W would be awesome. I would even accept lower 80+ rating in exchange for silence of these PSU's. That is what attracts me to them.
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Why avoid a higher wattage unit than what you need if it still gets you the efficiency and low noise you desire? It's not like the PSU doesn't only put out whatever power is demanded of it and nothing more. The only draw back would be the higher price, but as Paul said, lower wattage units wouldn't really cost any less.
 
Once again - i don't say they should put it in same line, i'm talking only abou tone thing - cooling method of Seasonic X series, which would be awesome with lower models too. For example my HTPC uses 45W in idle (~100W in burn) at socket side (so probably something in region 30-35W of real power usage due PSU efficiency) - wouldn't be awesome to see a PSU not spinning the fans at all at this usage ?

Of course i can buy a pico PSU for this, but they are not allways enough and this is why i would like to see either lower watage models of this PSU or this cooling method in other models. And be real - if this PSU is $199, then that translates to €199 in most times. 650W will be something around €179 i guess - which is simply a overkill power and price for a HTPC, where silence really matters.
 
faugusztin said:
For example my HTPC uses 45W in idle (~100W in burn) at socket side (so probably something in region 30-35W of real power usage due PSU efficiency) - wouldn't be awesome to see a PSU not spinning the fans at all at this usage ?
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Yes, it's called Seasonic X-750 :rolleyes: Did you even read the review?

The X-750 was stunningly silent. In Test #1 the fan did not actually ever start which had me a bit concerned that I had a bad unit as the box indicates that the fan will not start under 20% (+/-5%) load and 25C ambient temperature.
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The fan doesn't start under 20% load, that's ~150W right there. Again, did you not read the review?!
 
Raudulfr, i did read the review, but you don't want to understand it seems. In same way as you wouldn't take a chainsaw to cut a paper, you will not buy a 650W or 750W premium price PSU to handle a low power setup.

4850e - 45€ (last known price), M3N78 - ~60€, 2GB RAM - 30€, Scorpio Blue 320GB - 48€. That is ~180€ without the computer case and DVD. Do you really think it's in any way reasonable to buy a 180-200€ PSU for this setup ? If you have common sense, then the only answer is no.

What i'm trying to say that it would be awesome to have similar cooling method for example in M12II or S12 models, nothing else.
 
siliconnerd said:
That is surprising. Is most of the weight in the case? The electronics don't look like they would weigh that much with those small heatsinks.
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The casing is substantial but once I pulled the PCB out it was still heavier than expected. Interesting unit all around.
 
Ive been in the market for a new power supply in this power range, and you all just made my mind up for me! Cant wait till this thing gets on newegg, it will be in my case shortly thereafter! Thanks! Also I just want to give props to the [H] for your power supply reviews. You are the only PSU reviews on the net that I trust!
 
Wow, this is probably the first PSU I can finally get excited about again. Thanks for doing the review guys. I'll be sure to pick one up for my next build coming up next year.
 
I sent an email to Seasonic on 08/10/2009, and they told me the X-Series would not hit retail until November. Are you guys sure these are hitting Newegg soon? If so, I am going to return my unopened Corsair (still waiting on other parts for my P55 build in the mean time).
 
Great Review, but one Question on the Page 2 Specifications Sheet, "Overall, this is a superb set of paper specifications as the unit even advertises better than specification complaint voltage regulation." Here I'm referring to the Word, "Complaint" shouldn't that be Compliant?
If it's a Typo, then not a Problem, but just seemed strange reading, as I didn't think it was a Complaint, per se.

I'm pretty certain that this PSU will be on my Short List for my next build.
 
Jaguar Jim1 said:
Great Review, but one Question on the Page 2 Specifications Sheet, "Overall, this is a superb set of paper specifications as the unit even advertises better than specification complaint voltage regulation." Here I'm referring to the Word, "Complaint" shouldn't that be Compliant?
If it's a Typo, then not a Problem, but just seemed strange reading, as I didn't think it was a Complaint, per se.

I'm pretty certain that this PSU will be on my Short List for my next build.
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It should definitely say "compliant".
 
I hope this tech makes it to some SFX supplies, whether Seasonic branded or OEM'd for someone.
 
mike_j_johnson said:
I sent an email to Seasonic on 08/10/2009, and they told me the X-Series would not hit retail until November. Are you guys sure these are hitting Newegg soon? If so, I am going to return my unopened Corsair (still waiting on other parts for my P55 build in the mean time).
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Yes
 
Perfect timing. I was just looking for a PSU for a 2x 5870 build, replacing a M12 700w (gaining higher efficiency and native PCIe connections).
 
Originally Posted by mike_j_johnson View Post
I sent an email to Seasonic on 08/10/2009, and they told me the X-Series would not hit retail until November. Are you guys sure these are hitting Newegg soon? If so, I am going to return my unopened Corsair (still waiting on other parts for my P55 build in the mean time).
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I called Seasonic this morning to see when I can buy X 750 from NewEgg. Their people told me that X series will be available in the middle of October.
 
Man, wish this thing had been out when I was shopping for PSUs. Not that I mind my HX1000, it is a great unit, this just looks even better. 90% efficiency? Talk about awesome. What people need to remember is higher efficiency isn't just about saving energy, it means less heat too. More or less all the energy that isn't converted to DC is blown off as heat.

I also like it because it'd fit in the case better. The HX1000 is a big beastie. This looks much more reasonably sized.

However, think I'll have to stick with the 1000 for now.

Good to see the march of progress in PSUs though. They can never be too efficient or too quiet for my tastes :D.
 
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