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Old 12-12-2012, 12:10 PM   #1
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Default Seasonic X-Series KM3 650 W Power Supply Review

There has been a new article posted.

Title: Seasonic X-Series KM3 650 W Power Supply Review
URL: http://www.hardwaresecrets.com/artic...ly-Review/1690

Here is a snippet:
"Seasonic is releasing the third generation of their power supplies with the 80 Plus Gold certification, dubbed the X-Series KM3, using a completely different internal design. So far, three versions we..."

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Old 12-12-2012, 01:31 PM   #2
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Another good PSU from Seasonic!

Interesting, in that due to PCB space limitation, one X capacitor is mounted on top of another X capacitor (piggyback style) on the main PCB. I don't recall seeing this configuration before.
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Old 12-12-2012, 01:37 PM   #3
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Typical great review.

Nice to see fan information but you mention a KM3 650 Wi model??? has a different fan. Did you mean the old KM model???

This new KM3 model has flat cables but not the 16AWG for the motherboard,
ATX and video cables like the KM model.
http://www.hardwaresecrets.com/artic...ly-Review/1118




Which IC has the OPP???

I just noticed in the e-mail notification about the review that this new design is completely different and didn't notice that in the first read of the review. The primary side uses the same Intergrated Circuits but four switching section MOSFETs for a full bridge topology as opposed to the KM series, which uses two MOSFETs for a series parallel topology. Is this correct and other than the placement of the secondary MOSFETs the only design differences???

http://www.hardwaresecrets.com/artic...-Review/1118/4

I always thought the placement of the secondary MOSFETs on the solder side of the PCB so the transitors were cooled by both heat sinks and the PSU's case as an excellent design idea. A fellow reviewer thought the new placement on a daughter card was better for cooling. Any comment or opinion???

Last edited by Merman; 12-12-2012 at 02:56 PM.
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Old 12-12-2012, 02:55 PM   #4
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Seasonic has really been hitting the ball out of the park with this platform. That's one nice PSU.
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Old 12-12-2012, 06:14 PM   #5
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I don't mean to nitpick, but I really wish Seasonic wouldn't use those Enesol Polymers... If they're going to use all UCC caps for the electrolytics, why not PS series for the solid ones...
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Old 12-13-2012, 12:50 AM   #6
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^
I agree. On a more expensive product, NCC or OS-Con caps would be preferable.

At this point in time, however, I haven't heard of any reports of bad Enesol caps. The only solid caps I have confirmed reports of failures on are Lelon and Apaq, so in a review, we can't go knocking back awards over it until reports of failures come in.

Last edited by c.hegge; 12-13-2012 at 12:53 AM.
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No wonder it doesn't work! You installed the coils backwards!

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Old 12-13-2012, 01:56 AM   #7
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Talking about Enesol caps I don't don't why I couldn't find the homepage or product catalog last time.

http://enesol.co.kr/019.php

Got a kick out the of the company's Seoul office location:

Gangnam-Gu, Seoul, Korea
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Old 12-13-2012, 07:28 AM   #8
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Quote:
Originally Posted by brispuss View Post
Another good PSU from Seasonic!

Interesting, in that due to PCB space limitation, one X capacitor is mounted on top of another X capacitor (piggyback style) on the main PCB. I don't recall seeing this configuration before.
These two capacitors are connected in parallel, therefore they have their capacitances added.

Quote:
Originally Posted by Merman View Post
Nice to see fan information but you mention a KM3 650 Wi model??? has a different fan. Did you mean the old KM model???
I didn't get what you mean by that.

This new KM3 model has flat cables but not the 16AWG for the motherboard,
ATX and video cables like the KM model.
http://www.hardwaresecrets.com/artic...ly-Review/1118

Quote:
Originally Posted by Merman View Post
Which IC has the OPP???
OPP is usually controlled on the primary side by the active PFC controller, which has a current sensor to detect the maximum current the PSU is pulling from the wall; from that the manufacturer can configure a "trigger point" for the PSU to shut down.

Quote:
Originally Posted by Merman View Post
I just noticed in the e-mail notification about the review that this new design is completely different and didn't notice that in the first read of the review. The primary side uses the same Intergrated Circuits but four switching section MOSFETs for a full bridge topology as opposed to the KM series, which uses two MOSFETs for a series parallel topology. Is this correct and other than the placement of the secondary MOSFETs the only design differences???

http://www.hardwaresecrets.com/artic...-Review/1118/4

I always thought the placement of the secondary MOSFETs on the solder side of the PCB so the transitors were cooled by both heat sinks and the PSU's case as an excellent design idea. A fellow reviewer thought the new placement on a daughter card was better for cooling. Any comment or opinion???
Yes, the main difference is with the switching section (full bridge). I am posting a complete list Seasonic sent me below.

Quote:
Here is a short list of some of the differences between our new KM3 for the X series compared to the KM2.

1. 12V Line Regulation is now 2% instead of the 3%.
1.Internal: What we try to do is always deliver ≥12V to get better
efficiency
2.Internal: But this is not always possible in the factory, though we
are close.... so therefore we state 2% instead of +2%

2. S2FC/S3FC selector switch
1.Allows end customer to select the fan control modes

3. Flat Black DC Cables
1.Easier for system builds
2.Looks more matching to current cases
3.Better for airflow in system

4. Increased number of possible CPU/PCIe cable options
1.KM2 had on PSU side, 2x12Pin + 1x8Pin connectors for the CPU & PCIe
cables
2.KM3 has 5x8Pin which offers extra cable options

5. Platform:
1.KM3 is Full Bridge as compared to KM2's Half Bridge
2.Improved Reliability & Efficiency

6. MOSFET on Daughter Card instead of main PCB
1.Improves space utilization on main PCB for safety & cooling
2.Allows for increase of Ground Pad size on Main PCB for improved
efficiency

7. 9A, 85C high current connectors
1.Added security and reliability
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Old 12-13-2012, 09:45 AM   #9
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Quote:
Originally Posted by Gabriel Torres View Post

I didn't get what you mean by that.
This is exactly what you wrote on page one about the fan. Its the third sentence in the fan paragraph.

"This fan is different from the one used on the Seasonic X-Series
KM3 650 Wi."

Thanks for answering our questions and the extra info from Seasonic about the differences between the new and older designs.
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Old 12-13-2012, 01:09 PM   #10
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Has Seasonic EVER built a truly bad (or even mediocre) PSU? I can't think of any, not even the older Antec Earthwatts.
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