It has been a while - time for a gradual assembly attempt featuring some of my new parts!
On the upper half you see the 3.5mm bullet connectors I have successfully fried with the 3090- below the new hypothesis:
To the right, some MicroFit 3.0 connectors I intend to use for my own take on
@Josh | NFC 's
low-profile-connectors, this time for a NVidia 12-pin (thanks for the hint
@Vaderator) - to the left, 5.5mm bullet connectors with a rather comfortable 120A rating - should just about do the trick!
The size comparison illustrates the upgrade - and regardless of diameter, the 5.5mm connectors have sprung segments rather than a spring insert with a much bigger potential contact area. The MicroFit contacts, however, don't cease to amaze - the current I'll get through the massive 5.5mm bullet will eventually be consumed by the six tiny pins to the right.
Now, taking things apart:
The S4M is not only an amazingly compact and well-finished case, it's also super nice to work with as pretty much every panel can be taken out without having to disassemle anyhing else. In my case, I take out the front panel to which I have attached my PSU...
...and can start to work on it without removing the PSU from the frame. Reason for choosing a beefier connector rather than adding another set of power leads is that the cables run in front of the PSU's exhaust air grille and reduce the ventilation cross-section - also, they are not the bottle neck... The bullet connectors on the left were those feeding the GPU, and you can see how dark they are compared to those for the CPU, clearly suffering from too much sustained current...
...which becomes even more apparent when comparing them to a new connector.
Annoyingly, the male connectors (unlike the female ones) lose some of their gold plating, exposing the copper underneath, when soldering them... not sure whether I caught a bad batch, or whether I need a beefier solder tip to heat the tin quicker - anyway, they are so over-dimensioned that this should not become an issue.
In preparation for wiring up the GPU, I prepare two wires ending in female 3.5mm connectors that I will use to distribute to six 18 AWG wires each ending in the MicroFit3.0 connectors for the GPU.
The connector seems to be of the right size...
...and after a bit of practice, I get a satisfying result crimping them onto the 18AWG silicone wires I have set aside for this - actually being a bit thicker than what the spec sheet calls for.
To make sure I get no nasty surprises in case a crimp is coming loose (you don't want a vagabonding +12V cable in your build...), I add some solder to the connection - better safe than sorry.
That's how the result looks like with some shrink wrap applied,
making for a surprisingly tight and robust fit in the 3090's 12-pin connector - it almost clicks in and takes quite some force before pulling out.
This is where I leave it for now:
To bend them into the correct angle using
@Josh | NFC 's method for low-profiles connectors requires me to strip the GPU, and as I want to lengthen the branch cables correctly when I have routed them around the connector, I park this until I am tackling the GPU.
Along with the PSU, I also upgrade my other wiring to 5.5mm connectors (oops, bokeh-overkill):
From left to right, my "GPU starter cable", the ultimate GPU wires, and the CPU power connector.
The offset female/male pairing of the wires ensures that exposed male pins on PSU side are ground, and that the +12 female ends are reasonably well protected. Offsetting the cable ends by a connector's length makes a short at the PSU near-impossible, even with nothing plugged in; the shrinkwrap around the positive ends is cut with a tiny overstand to protect the connector edges.
With that done, I can fit the PSU back into the front frame - and: Tadaaa....
...attach my new heat sink bezel. This picture shows how the machined pads of the bezel match the perforations in the S4Ms frame...
...which is key to establish direct contact with PSU and for the bezel to contribute to heat distribution.
With some thermal tape for proper contact...
...the bezel goes on and fits precisely (which is always a bit of a relief when using self designed parts).
Four M3 hex screws hold it on the frame...
...with the air slots directed at the PSUs intake side.
Moment of truth:
Bingo!
Clearly that GPU still parks outside of the case - and the reason I haven't stripped it yet is this:
I have a bit of a riser situation.
As the 3090 is shorter than the 2080ti I had in there originally (which is a good thing as it stays clear of the main fan), the PCIe connector needs to move 55mm to the right (you see the notch where it has been before) - and that, in turn, means, that my amazingly thin HDPlex riser cable is 55mm too short.
So, my very naive first take on this is to daisy-chain it with a shorter riser and extend it, and spatially that's a perfect fit...
...and it does power up - but unfortunately not even get me to a bios screen.
Next bus stop: Shielding. Perhaps it's just some undesired interference (and yes, I have switched the PCIe x16 interface to 3.0)...
Applying some space-age aluminum foil, I wrap my cable for some neutrino-proof shielding...
...and BAM, one step further:
I get a boot screen.
But that's it - hang upon switching graphics modes at windows logon, so no HDPlex for me
Looks like I'll have to ponder over this a bit further -
@Vaderator's great find of the pretty amazing
Louqe Cobalt cable would not cut it in my case as the 3090 is a bit wider than the 3070/80, and the Cobalt's GPU connector is rather deep; I need something that puts the connector more or less flush at the case's rear for the GPU to fit. Or it's back to ultra-low profile RAM... but that would be a step back, and that's not what we are doing here.
The
@LINKUP 4.0 prototype cable I am using for my dry runs with the 3090 is too tall on the GPU connector end at 24mm (that's measured normal to the GPU's PCB):
I only have about 15 to spare - so I need something that has pretty much the HDPlex's geometry...
...on a >=260mm cable.
Plus, it's a rather exotic right-angle-type (270 degrees).
PCIe 3.0 would be well-sufficient... any ideas, proposals, one-off engineering samples, prototypes, custom builds or wireless interfaces are most welcome!