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Is this mod safe?

oquotron
By oquotron
in Cases and Mods
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So I recently upgraded to Ryzen with an m-atx motherboard with only two fan headers, so I took the fan hub out of my old H440. The hub is powered by molex so all the fans run at 100%. I found an old molex fan splitter like this and I switched around the 12v and 5v on the output side of the molex that leads to the fan hub, so the hub now only gets 5V and the 12V leads to an empty 2 pin header. Now all the fans are running very quiet.

 

I made a quick diagram in paint of what I did. Is this mod safe?

molex.png

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If the fan hub is the stupid type, then you can do that. Most entry level PSUs can handle a few fans on the 5V rail just fine.

CPU: i7-2600K 4751MHz 1.44V (software) --> 1.47V at the back of the socket Motherboard: Asrock Z77 Extreme4 (BCLK: 103.3MHz) CPU Cooler: Noctua NH-D15 RAM: Adata XPG 2x8GB DDR3 (XMP: 2133MHz 10-11-11-30 CR2, custom: 2203MHz 10-11-10-26 CR1 tRFC:230 tREFI:14000) GPU: Asus GTX 1070 Dual (Super Jetstream vbios, +70(2025-2088MHz)/+400(8.8Gbps)) SSD: Samsung 840 Pro 256GB (main boot drive), Transcend SSD370 128GB PSU: Seasonic X-660 80+ Gold Case: Antec P110 Silent, 5 intakes 1 exhaust Monitor: AOC G2460PF 1080p 144Hz (150Hz max w/ DP, 121Hz max w/ HDMI) TN panel Keyboard: Logitech G610 Orion (Cherry MX Blue) with SteelSeries Apex M260 keycaps Mouse: BenQ Zowie FK1

 

Model: HP Omen 17 17-an110ca CPU: i7-8750H (0.125V core & cache, 50mV SA undervolt) GPU: GTX 1060 6GB Mobile (+80/+450, 1650MHz~1750MHz 0.78V~0.85V) RAM: 8+8GB DDR4-2400 18-17-17-39 2T Storage: HP EX920 1TB PCIe x4 M.2 SSD + Crucial MX500 1TB 2.5" SATA SSD, 128GB Toshiba PCIe x2 M.2 SSD (KBG30ZMV128G) gone cooking externally, 1TB Seagate 7200RPM 2.5" HDD (ST1000LM049-2GH172) left outside Monitor: 1080p 126Hz IPS G-sync

 

Desktop benching:

Cinebench R15 Single thread:168 Multi-thread: 833 

SuperPi (v1.5 from Techpowerup, PI value output) 16K: 0.100s 1M: 8.255s 32M: 7m 45.93s

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20 hours ago, oquotron said:

So I recently upgraded to Ryzen with an m-atx motherboard with only two fan headers, so I took the fan hub out of my old H440. The hub is powered by molex so all the fans run at 100%. I found an old molex fan splitter like this and I switched around the 12v and 5v on the output side of the molex that leads to the fan hub, so the hub now only gets 5V and the 12V leads to an empty 2 pin header. Now all the fans are running very quiet.

 

I made a quick diagram in paint of what I did. Is this mod safe?

Yes the 7V mod is safe just be sure to label that cable and not to use it for anything else that will need 12V molex. 

Updated Modding FAQ

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2 hours ago, W-L said:

Yes the 7V mod is safe just be sure to label that cable and not to use it for anything else that will need 12V molex. 

Wouldn't this technically be a 5v mod not a 7v mod? I just flipped around the 12v and 5v wires, but for the 7v mod you put the 5v where the 12v ground is to get the difference in voltage, iirc.

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4 minutes ago, oquotron said:

Wouldn't this technically be a 5v mod not a 7v mod? I just flipped around the 12v and 5v wires, but for the 7v mod you put the 5v where the 12v ground is to get the difference in voltage, iirc.

Yes correct, if you are just using ground and the first pin on the left then it would be 5V. 

Updated Modding FAQ

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