Seasonic X-Series 750W: Potent for the Price
by Martin Kaffei on April 13, 2010 11:13 PM EST- Posted in
- Cases/Cooling/PSUs
- Seasonic
- PSUs
X750 - Internal Design
Seasonic created a very unique layout with the X-Series. Even though the basic idea is similar to other designs (e.g. Revolution85+ series) in placing both VRMs on the PCB for cable management, it is an unusual structure together with SMDs (Surface Mounted Devices). The layout looks particularly open because all the rectifiers in the secondary circuit are on the back of the plate and only small dissipaters pass through the PCB.
We can see that the X-series wants to meet high-end requirements as opposed to the Pro/Modu87+ series by looking at the line filtering stage (from Yunpen) behind the AC-inlet, which is more expensive and improved compared to using individual filtering components. With a pair of Y-capacitors and a current-compensated choke it is suitable against common mode interferences, contains above all another X-capacitor. Also a MOV was integrated into the filtering, which continues on the motherboard together with some more devices.
Taking a look at the Power Factor pre-regulator, you can see a well stabilized choke and two Nippon Chemi-Con main capacitors. Both are specified at 400V, 360 microfarads, and 105 °C. The circuit with a resonance converter and champion controller (CM6901) follows, as already mentioned. The last component is physically located behind the fan control in the bottom left corner, as you can see on the following picture.
The X750 uses many solid-state capacitors, likewise from Nippon Chemi-Con, and small upright-coiled chokes shape the look of the secondary circuit. The PS223 safety device chip from Silicon Touch provides necessary safety features like OPP. There is still no OCP, but we have never encountered any problems in practice. Current flows over a small number of cables to the DC-to-DC converter, which is equipped with an Anpec controller. The smaller +3.3V and +5V are generated there connect to the connection panel and modular cables, along with +12V.
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Londeninfo - Wednesday, September 7, 2011 - link
My pc psu have been causing troubling me from many days. Whenever I touch the CPU i feel the electric shock.I cant figure out the problem!!!!<a href="http://www.londeninfo.com/">Londen</a&g...
Londeninfo - Wednesday, September 7, 2011 - link
<a href= "http://www.londeninfo.com" > Londen </a>Earthmonger - Wednesday, April 14, 2010 - link
Is it okay if I use this review to comment on something I'm getting really tired of seeing in upper class power supplies? It is? Thanks.[quote=Martin Kaffei]The cable sleeves are well done and help keep everything looking neat and organized, as does the fully modular cable system.[/quote]
This. These cables are not well sleeved. Every time I see bare wires on these expensive new units I roll my eyes, and add $40 to the end cost, since I'll have to completely re-sleeve all cables. It's awesome (seriously) that they're going fully modular these days, but for the price premiums, you'd think they would care more about the details.
bigboxes - Wednesday, April 14, 2010 - link
How anal are you? If you must cover the last 1/4 inch of wires where they meet up with the connector why don't you just use some additional shrink tubing?Minion4Hire - Wednesday, April 14, 2010 - link
Yea, what's the big deal? To my understanding one of the reasons they don't sleeve them to the very ends is to allow greater flexibility and bends in the cable to help make installation easier, which can be especially useful in smaller chassis. The shrink tubing at the end of the sleeve isn't exactly flexible, and would and would "pad" the back of the connectors by several centimeters if they were butting up against it. Better for the cables? Potentially. But I'm willing to bet that the average person would find it to be that much more painful and annoying during installation.Earthmonger - Wednesday, April 14, 2010 - link
Quite anal, yes. If a wire isn't completely sleeved, it shouldn't be sleeved at all. It just feels half-assed.As for the reduction in flexibility, not all heatshrink is rigid. I have some laying around here that is soft and pliant. Nor does it take several centimeters of heatshrink to do the job.
I do prefer individually sleeved cables though. Wire clusters aren't flexible enough, whereas I can bend a flat double-row of individuals right around a 90 degree without issue.
7Enigma - Wednesday, April 14, 2010 - link
What a poor comment. The purpose of sleeving is for better air flow and easier access to components. The terminal ends are kept free for better connectivity.You can glitter up your case/components all you want to satisfy the anal inner-you, but for the rest of us, I think we find this more than acceptable sleeving.
bigboxes - Wednesday, April 14, 2010 - link
I know what you are talking about. I just find you are a tad unrealistic. If you want bling then maybe you're looking at the wrong mfg. Seasonic is for the enthusiast. It's fairly plain, but well built and engineered. I prefer function over form and I still think it looks good. Of course I don't have a window or lights in my case. I like quiet. I have sleeving mesh and shrink tubing, but the sleeving on this unit (and all Seasonic PSUs) is top notch. I have sleeved up to (and even over) the connector before. I just think you are asking too much from the mfg in this case. Sounds like you are going to redo whatever someone else does because you have certain tastes that only you can live up to. And that's tottally understandable. I'm sure most people think I'm too anal over my builds too. :)HOOfan 1 - Wednesday, April 14, 2010 - link
If I saw bare wires...I would stay very far away from the PSU...talk about short circuits....Luckily, these wires aren't bare, they are covered in plastic isulation.
Smartass remark out of the way, there is no way to extend the sleave all the way to the end, the wires would have to be individually sleaved, or done like the flexforce cables...individually sleaving them would raise the price exponentially.
MrSpadge - Wednesday, April 14, 2010 - link
What an amazing comment!(1) you need to spot the "missing" sleeve at the end of the cables
(2) you have to recognize it as something you don't like
(3) you have to seriously consider fixing it for 40$ in case you'd want to buy this PSU
I'm not sure anyone else on this planet could fulfill all 3 ;)