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HP Proliant ML350p G8 Watercooling!


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High Bruno welcome to the club. I hope you do take the time to follow trough and publish your modifications as weel so we can all learn from each other.


Just for all of you to know I just succeeded under Proxmox in passing trough a PCIE Slot with an LSI HBA Controller into a Freenas VM.

Yes I'm running Freenas virtualized and am happy with it.  You can find the topic here.

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  • 1 month later...

Hi everyone, I'm new here and came across this thread while searching how to make the fans quieter on my G8 ML350p. I bought it second hand last December and have slowly been upgrading it. 


Originally came with 1x E5-2620 (6 core, 15MB cache), 24GB ram. Now has 128GB of ram (8x 16GB sticks), plus a Gigabyte GeForce GTX 1660 SUPER. Upgraded the CPU to E5-2660 (8 core, 20MB cache). All 128GB of ram is allocated to CPU 1. I scored the 2260 CPUs as a pair, but only have one heatsink at the moment. 


Managed to install Win10 without any of the issues other seem to be having. Powering the GPU was a challenge. The 460W PSUs didn't have the juice to do it, so I've currently got a separate 1000W ATX supply powering just the GPU, with the motherboard sense on the PSU jumpered. 


To do, in no particular order:


1. The fan mods on this thread.

2. Install second 2660 CPU, and reallocate ram 64/64 even split. This will require getting the correct heatsink, or sourcing an aftermarket one, or modding something.

3. USB 3.0/3.1 PCI card and front panel.

4. Swap out the 460W PSUs for 1200W versions, so I can remove the ATX bodge-job.

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  • 6 months later...

Hello everyone.

I'm thinking of completing the HD bays, completing the two bays that come empty. Does anyone know any place that sells cage (660351-001) at an affordable price?

Converting from USD to BRL would be cheaper if I buy another server here, or sell mine.


Ps: in time, did anyone make a mod to use the 18 discs?



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  • 5 months later...

Hello all,


I’m just wondering how you’re all getting on with your cooling modifications…


I picked up an ML350p recently and as you’re all well aware it is much too loud for home use. I have mine in the loft and can hear those fans from a room or two away.


I’ve ordered a pair of NH-U9DX i4 coolers and I figure I’ll just find a 12V rail and run them at 100% in the short term. Longer term I’m looking to add a couple of intake & exhaust fans and a controller of some description.


Any advice or progress reports would be much appreciated.



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Hello All,


I've also recently purchased an ml350p. My background is electrical industrial instrumentation and control; not really a PC guy... yet. I'm working on it lol. My first job was getting my GPU to work. Struggled to find consensus or a well explained pinout with regards to using consumer GPU cards in these machines. I couldn't find the the OEM cable anywhere. It took me some time to get it working. My issue turned out to be power related. So, for other noobs getting scared off doing this like I almost was, here's what I have confirmed, using a Fluke 789:


(for reference)

Normal PCIe8 pinout:

Pins 1,2,3 are +12V

Pins 5,7,8 are 0V (GND)

Pin 4 (Sense 8 pin plug) 0V (GND)

Pin 6 (Sense 6 pin plug) 0V (GND)


(what I found)

HP PCIe Pinout (when compared to the above, using the same pin numbers)

Pins 1,2,3,4 are +12V

Pins 5,7,8 are 0V (GND)

Pin 6 (Sense) 0V (GND)




I have found references on reddit and other forums indicating that Pin 3 in unused, and its position is shifted to Pin 4. My tests show it at 12V, I'm not sure if there are some smarts in the machine that can switch this pin? Maybe mine is not standard? Consensus is that Pins 1-4 should be at 12V and Pins 5-8 at 0V or GND.  I can confirm that my 6GB GTX Titan works with this mod.


I modified a standard PCIe 8 to 8+6 cable by leaving the GPU side as per normal and changing the mobo side to what HP expects. I had to make a custom cable since the mine was not long enough. So I only ended up using the plugs really, I tried to remove as much of the original cable as possible, it seemed like sh** cable. Since I work in the industrial sector I used what I had access to, which was 1mm marine grade flex https://www.firstflex.co.nz/product/mst001-0/ I made it 450mm long and it was a comfortable fit. If I were to make it again, I would increase the length to 500mm for looming purposes. 


Next I will be working of fans. Thing sounds like an aircraft; my wife was suitably unimpressed when i brought it inside. I would like to make use of the original connectors, fan cage etc, if I can, and modify as little as possible. Maybe make a custom PCB to invert the PWM and add some current limiting for ordinary fans. If i got into full mod mode, I have a ABB commander 350 in the garage somewhere, might look cool mounted inside the unused drive bay. I have also started soldering up a custom water-block from some busbar plate I have around the place, I'll use Swagelok fittings and 1/2" Teflon tube. MPa rated, so should be fine for this pressure range ha ha. Still not figured out how to mount everything yet. Got a million other projects on so we'll see how long it takes me to get round to finishing this one.


StretchNZ if you're about mate, would be nice to chat about your machine. I live in Auckland.




Edited by JamesT
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