Log ThinkStation P350 Tiny - 1L Pocket Rocket Lake with RTX A2000

ondert

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Apr 16, 2017
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This is insane, I've always appreciated your works getting smaller and smaller. Really liked the idea and just checked the prices on eBay desperately. btw, what happened to your website?
 
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Trov

Case Bender
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Apr 19, 2022
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The most recent Dell Optiplex 7080 Micro has a PCI slot option now, except it orients the GPU facing down. This might give you about half a slot height of extra space for heatsink/fans...

 
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SFFMunkee

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Jul 7, 2021
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re the existing fan, it's not a standard sized fan header connector, from googling it appears to be a "laptop molex connector". Does that seem right to you? Do you know what part number that connector is pls?

I need to measure it when I take the build apart for the fan voltage mod...

Here is a picture I took last time:

View attachment 1732
It looks like a JST connector of some description, I think GPU fans use JST PH (2.0mm pitch) connectors, which looks about right.

::EDIT:: Actually on second glance, it looks like a surface mount connector, which means it might be a JST SH (1mm pitch), but they're only rated to 1A @ 50V according to the JST connector wiki.

I'm suggesting they're probably a 4-pin PH as they're rated for up to 3A @ 100V and have 2.0mm pitch, with through-hole connectors. Given the P350's fan is rated at 1.5A that would lead me to assume they wouldn't be using a 1A-rated connector :)
 
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morj

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Feb 11, 2020
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The most recent Dell Optiplex 7080 Micro has a PCI slot option now, except it orients the GPU facing down. This might give you about half a slot height of extra space for heatsink/fans...


Not quite, the motherboard actually extends there, so your GPU fan will be jammed between the motherboard PCB and GPU PCB.
 

mikejmcfarlane

Cable Smoosher
Apr 19, 2022
12
9
It looks like a JST connector of some description, I think GPU fans use JST PH (2.0mm pitch) connectors, which looks about right.

::EDIT:: Actually on second glance, it looks like a surface mount connector, which means it might be a JST SH (1mm pitch), but they're only rated to 1A @ 50V according to the JST connector wiki.

I'm suggesting they're probably a 4-pin PH as they're rated for up to 3A @ 100V and have 2.0mm pitch, with through-hole connectors. Given the P350's fan is rated at 1.5A that would lead me to assume they wouldn't be using a 1A-rated connector :)
thnx will measure it up when my P350 arrives on Monday
 

REVOCCASES

Shrink Ray Wielder
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Apr 2, 2020
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The most recent Dell Optiplex 7080 Micro has a PCI slot option now,

Only if you order one with dGPU or other PCIe add-on card. Else the connector is not soldered to the motherboard. Some people who tried getting a 1650 to work with it also said the slot is limited to 55W only. But not sure...

I've always appreciated your works getting smaller and smaller. Really liked the idea and just checked the prices on eBay desperately. btw, what happened to your website?

Thanks! Website should be fixed now, some update gone wrong XD
 

CC Ricers

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Nov 1, 2015
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Have you thought about making a custom case for this particular build so it can also fit a dedicated PSU? A brick-less build like with your SMALL3 case but even smaller and using a 12V instead of FlexATX PSU. I'm sure you can still keep the entire build under 1.5L.
 
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REVOCCASES

Shrink Ray Wielder
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Have you thought about making a custom case for this particular build so it can also fit a dedicated PSU? A brick-less build like with your SMALL3 case but even smaller and using a 12V instead of FlexATX PSU. I'm sure you can still keep the entire build under 1.5L.

I thought about it. But more as a backup plan. If my A2000 single slot mod hadn't worked out there would have been unused space on top of the CPU cooler for a slim internal PSU.

Overall the brick solution is fine for me - having the original large brick at home under the desk and the small SAVAGO GaN adapter in my backpack for the road.
 

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Shrink Ray Wielder
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the 5A 12V to 5V step-down module came in today and I tested it with my 20W DYNATRON cooler... on my "test bench" it seems to work pretty well to get RPM (and noise) down... now I just hope LENOVO did not implement some kind of "fan failure checking" in the firmware XD

IMG_20220424_1255477.jpg

IMG_20220424_1301356.jpg

RPM without the buck:

IMG_20220424_1305033.jpg

reduced RPM with the buck:

IMG_20220424_1305309.jpg

also ordered some small thermal switches to see if I can DIY a 0-RPM fan mode for my A2000

IMG_20220424_1313449.jpg
 

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Shrink Ray Wielder
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it's been a while but I finally found some time to proceed with my "low noise" mods... oh, and I painted my single slot mod heatsink!



mod1: as mentioned before, I found the LENOVO stock CPU fan curves very annoying and the only way to get CPU fan speed down seems to be the hard(ware)-way





with the voltage step down module and some heatsink mods, the P350 Tiny is now finally dead silent in idle and even under load it's totally acceptable. Interestingly, temps are about the same as before - probably because I added some copper fins, heatpipes, etc to the original cooler - seems that makes up for the lower fan speed.

mod2: there is no way to get the fan speed on the A2000 below 3000RPM which is IMHO unnecessary, especially in idle... so I came up with the idea to make my own 0-RPM mode for it, using a small thermal switch glued to the aluminum heatsink. this switch will simply cut the power to the fan if the heatsink temperature is below a certain threshold.



for my mod I used a thermal switch with a rated "switching temperature" of 55K but this does not mean it will actually switch on/off at this precise temp. It's more of a temperature range with an "on" point at about 59C and "off" at about 46C. another issue with this solution is the fact that the heatsink temperature will not raise or drop as fast as the actual GPU temp. anyways, it works and I'm quite happy with the result. my A2000 idles now at about ~58C without fan(noise) and once the GPU reaches ~79C, the fan kicks in to keep it cool under load.

mod3: painting the heatsink with black, high temp "exhaust pipe" paint





of course this looks nice but more importantly, it dropped average temps on my A2000 by about 2~3C - not much but in such a small build every improvement counts.

sooo, I think I'm happy with the build (for now) - hope you found this interesting/helpful 😊