S4MAX: Brickless S4M w/ 3090 FE and R9 5950x - 800W, 5l, water cooled

Gehringerj

X299 Supporter
Bronze Supporter
Oct 1, 2018
19
4
Next update: Modding the Pico!


With the proof-of-concept delivered, it's time to mod the Pico PSU to get rid of the spaghetti on the left hand side and turn it into something a little more SFF-ish.

For this to work, I need to replicate my modifications to the ATX extension cable on the pico board - cutting the +5V Standby pin of the ATX plug off from the board and feed it from the PSU directly, and linking the Pico's PS_ON signal pin to the corresponding one on the PSU:



The tricky bit will be cutting off the solder pad of Pin 9 to realibly isolate it from the board. Unsoldering did not really work as the pin physically overlays the pad, even with the solder removed.


Instead, I'll have to resort to slighly heavier tools: A Dremel with a small diamond cutting disc, hoping that I can cut one pin off without damaging anything else...


...and at first sight the result looks ok - a clearly visible "trench" separating pin and pad, cut slightly into the pcb to ensure no contact remains.


Initial measurement looks good...


...and when hooking it up to the PSU tester, I get the desired result: no reading on the +5VSB input, meaning the Pico is successfully disconnected from standby output:


Now I carefully solder the bypass cable into the pin, trying to avoid any contact with the original pad...


...and test the result for proper isolation before connecting the bypass to power - looking good!


Connecting the bypass cable to the PSU, the +5VSB output comes on - seems to work:


Next and less complicated step is soldering a wire onto the pad for pin 16, providing the PS_ON link.


...and plugging the Pico into the PSU tester, the PSU immediately comes to life - seems to do the trick!



WIth some preliminary shrinkwrap makeup applied, the plugin board starts to look reasonably tidy...




...and all that remains to be done is to give it a real world test drive!



This is also a nice opportunity to compare the modded pico with the HDPLEX direct plug: Significantly smaller - but clearly inferior in terms of blackness (black picos, anyone?), and somehow missing that weapon-grade feel of the heavy heat sink...
...anyway, I have a feeling that I'll get to appreciate any tiny amount of volume saved!



All fires up!

Up next: Raising the stakes and throwing some other interesting parts into the mix to avoid this turning into a PSU-modding-only-thread - aim still remains to build a machine!
Great work, how did you get pin 8 (24 Pin: PwrOk/ Power Ok) from the PSU to the 24pin for the Mainboard?
 

AURMEND

Destroyer of PCs
A&M Solutions and Design LLC
Gold Supporter
Jul 30, 2018
198
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Well i finally got off my lazy butt and I'm restarting the 800w PSU project after my first attempt (old PSU made some weird noise)

I have designed and ordered a custom PSU housing. Once fitment is confirmed I'll adjust it properly.
Other than airflow, (going to start with a 40mm noctua) what do you think will help it lower temps? I'm thinking of Aluminum heatsink instead of the top cover somehow or more fans on the top cover if i can fit them.

Also what's currently the best Pico PSU for the 24pin? I'm hooking up the CPU connector to the 800w PSU
 

Ikki kurogane

Cable Smoosher
Jan 9, 2020
8
2
Great work, how did you get pin 8 (24 Pin: PwrOk/ Power Ok) from the PSU to the 24pin for the Mainboard?
what do you mean he just solder a wire onto the ps-on pin on the PSU and then solder the other end of the wire to the pico 24pin ps-on pin, you don't need to cut it like the 5vsb, thats all, but that's for the 600w of the PSU, the 800w is a bit different
 

SFFMunkee

Airflow Optimizer
Bronze Supporter
Jul 7, 2021
269
229
Well i finally got off my lazy butt and I'm restarting the 800w PSU project after my first attempt (old PSU made some weird noise)

I have designed and ordered a custom PSU housing. Once fitment is confirmed I'll adjust it properly.
Other than airflow, (going to start with a 40mm noctua) what do you think will help it lower temps? I'm thinking of Aluminum heatsink instead of the top cover somehow or more fans on the top cover if i can fit them.

Also what's currently the best Pico PSU for the 24pin? I'm hooking up the CPU connector to the 800w PSU
If you just want to do 24-pin & CPU(EPS) then I'd look at the J-Hack 2426 or 200X (though honestly there are plenty of options for DC-ATX that are probably fine on AliExpress and the like).
 

AURMEND

Destroyer of PCs
A&M Solutions and Design LLC
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Jul 30, 2018
198
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Did a heatsink mod on the PSU, just have to make sure that it doesn't touch the chassis. As for the fan, i wonder if a chipset fan is fast enough.
IMG_15062022_030554_(1080_x_720_pixel).jpg
 
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SFFMunkee

Airflow Optimizer
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Jul 7, 2021
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I have a little fan update to share at some point... long story short: Summer+Gaming in VR+40mm Noctua fans don't mix
Nooooo, now what do I do when I tell people "pff, you can go smaller"!?

What was the room ambient temperature when you killed it (the PSU I assume)?
 

petricor

Airflow Optimizer
Original poster
Bronze Supporter
May 12, 2018
282
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No worries - problem already solved 🥳
Just need to get to posting an update! And as a little teaser: All key components including the PSU stay the same (no reason to undo any mods…)- and it involves cramming more stuff into the very same enclosure, so it shouldn’t disappoint!
Nooooo, now what do I do when I tell people "pff, you can go smaller"!?

What was the room ambient temperature when you killed it (the PSU I assume)?
 

SFFMunkee

Airflow Optimizer
Bronze Supporter
Jul 7, 2021
269
229
No worries - problem already solved 🥳
Just need to get to posting an update! And as a little teaser: All key components including the PSU stay the same (no reason to undo any mods…)- and it involves cramming more stuff into the very same enclosure, so it shouldn’t disappoint!
Huzzah verrily!
 

AURMEND

Destroyer of PCs
A&M Solutions and Design LLC
Gold Supporter
Jul 30, 2018
198
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well i have hit an air cooling roadblock. might go custom watercooling. The hard part is that there is only chinese waterblocks for the Zotac 3070 twin edge.
Here is the Alphacool ST25 92mm Dual Radiator (184mm) 227 total length
1655913025182.png
edit. yeah no way i can place the gpu ontop of the mobo with my cababilities
 
Last edited:

NinoPecorino

Tweezer Squeezer
Gold Supporter
Nov 24, 2017
463
451
well i have hit an air cooling roadblock. might go custom watercooling. The hard part is that there is only chinese waterblocks for the Zotac 3070 twin edge.
Here is the Alphacool ST25 92mm Dual Radiator (184mm) 227 total length
View attachment 1897
edit. yeah no way i can place the gpu ontop of the mobo with my cababilities
i bet you can figure it out. what do you think the biggest impediment is?
 
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AURMEND

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Jul 30, 2018
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i bet you can figure it out. what do you think the biggest impediment is?
I need the length of the FE card or else I'll be close to 5 liters in volume. That and i might as well just refine my air-cooled case to reach 4 liters
 
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NinoPecorino

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Nov 24, 2017
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I need the length of the FE card or else I'll be close to 5 liters in volume. That and i might as well just refine my air-cooled case to reach 4 liters
it's pretty lame that ek put out that 3070 fe block with the terminal at the end of the card. could have been roughly r9 nano sized with the terminal on top.
 
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