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Copy file name to clipboardExpand all lines: _posts/2025-04-30-psu-cable-journey.md
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@@ -22,7 +22,7 @@ Since I had already replaced all the fans and wired them directly to my SuperMic
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## The Molex Nightmare
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Seasonic only includes **one** 6-pin to 4-pin Molex cable, and I needed four. Worse, the backplane is powered entirely via Molex, the same old 4-pin IDE-style connectors that IDE drive used (which no one has by the way). I wonder why they have no switched SATA power. It’s more available,and the cables are far more for the tight spacing underneath the HL15's backplane. I'm assuming it's just a design that dates back to when it was first designed and since they designed the backplane they can also design any cables they want.
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Seasonic only includes **one** 6-pin to 4-pin Molex cable, and I needed four. Worse, the backplane is powered entirely via Molex, the same old 4-pin IDE-style connectors that IDE drive used (which no one has by the way). I wonder why they have not switched SATA power. It’s more available,and the cables are far more suited for the tight spacing underneath the HL15's backplane. I'm assuming it's just a design that dates back to when it was first designed for servers. Also, since they own the design for the backplane they can also design any cables they want.
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_HL15 power breakout cables for fans and backplane_
@@ -34,15 +34,15 @@ I searched for Seasonic compatible 6-pin to Molex cables. No luck.
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-**Seasonic** pointed me to [BTOS Integration](https://btosinte.com/), who doesn't make or sell these cables.
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-**Noctua**, despite collaborating on the PSU, had no cable leads (pun intended).
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-**[CableMod](https://cablemod.com/)** couldn’t offer right-angle Molex ends that would clear the space under the backplane.
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-**[ModDIY](https://www.moddiy.com/)***could* make custom right-angle Molex cables but at ~$30 each after customizing the length. I needed 8 cables (2 servers), which would run nearly **$300** with shipping. Not the end of the world, but also not what I wanted to pay if I could find it cheaper elsewhere.
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-**[ModDIY](https://www.moddiy.com/)***could* make custom right-angle Molex cables but at ~$30 each after customizing the length. I needed 8 cables (2 servers), which would run nearly **$300** with shipping. Not the end of the world, but I wanted to shop around before shelling out this kind of money for cables.
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I then contact **45Drives** directly since they made the original cables for Corsair PSUs, I hoped they’d offer ones for Seasonic too. I thought they might be interested since they have partnered with Noctua on fans and might sell this PSU at some point. Unfortunately they could not make them. They suggested I contact CableMod, which I already did, so the cable hunt continues.
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At this point I was running [SATA-to-Molex adapters](https://amzn.to/3Yo2UTr) (affiliate link) as a temporary workaround, creating a rat's nest of cables.
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## A Needle in the Haystack
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After scouring eBay, Amazon, and finally AliExpress, I found a set of cables that looked promising, a 6-pin power to 3x 4-pin Molex (IDE) right-angle power cable. The listing is now gone, but [here’s the archived product](https://www.aliexpress.com/item/3256803054611474.html?spm=a2g0o.order_list.order_list_main.5.69481802JPp5Jo).
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After scouring eBay, Amazon, and finally AliExpress, I found a set of cables that looked promising, a 6-pin power to 3x 4-pin Molex (IDE) right-angle power cable that is supposedly compatible with Seasonic power supplies. The listing is now gone, but [here’s the archived product](https://www.aliexpress.com/item/3256803054611474.html?spm=a2g0o.order_list.order_list_main.5.69481802JPp5Jo).
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I ordered **9 cables** ($3.56 each—one spare) and waited.
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@@ -51,7 +51,7 @@ _"Seasonic compatible" 6-pin to Molex cables_
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## Safety First
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When the cables arrived, I didn’t plug them in immediately. I needed to make sure the pin-outs matched. I almost fried my PSU and backplane once by using the Corsair cables, I didn't want to come close to doing it again.
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When the cables arrived, I didn’t plug them in immediately. I needed to make sure the pin-outs matched. I almost fried my PSU and backplane once by using the Corsair cables, I didn't want to do that again.
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I posted this question on X:
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@@ -80,9 +80,9 @@ This whole adventure reaffirmed two things:
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1.**Always test your modular cables.** Even if they look the same, they aren’t.
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2.**Power supplies should use standardized modular connectors—or none at all.** This halfway point of using identical-looking connectors with proprietary pin-outs is a recipe for disaster. I feel like it's in everyone's best interest for power supply makers to standardize this.
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If you’re planning to swap PSUs in your HL15 or PC/server, be ready to go deep into the rabbit hole of custom cables. And yes those old Molex connectors are still around, like it or not.
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If you’re planning to swap PSUs in your HL15 or PC/server that has parts made for a different PSU, be ready to go deep into the rabbit hole of custom cables. And yes those old Molex connectors are still around, like it or not.
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The HL15 is finally back in the rack, and it's running great. Clean cables, quiet fans, and quiet and solid power delivery.
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The HL15 is finally back in the rack, and it's running great. Clean cables, quiet fans, and solid power delivery.
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If you're curious, I ranted about this whole issue with modular power cables and PSU manufacturers here:
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[I Rebuilt My Home Server — Quieter, Faster, and Ready for 2025](https://www.youtube.com/watch?v=NOaLlOAIWUU)
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Also, if you're interested in this PSU it's hard to find right now. Noctua said the demand for this CPU is much greater than they anticipated but more stock is on the way.
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Also, if you're interested in this PSU it's hard to find right now. Noctua said the demand for this PSU is much greater than they anticipated but more stock is on the way.
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