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Mini-DTX Hype Thread (ITX with two PCIe slots!) - Page 80

post #791 of 976
Quote:
Originally Posted by Dyson Poindexter View Post

The 4-pin MiniFit Jr should be able to handle 200W and stay in spec (not sure what ATX says the max draw is, but remember 4 pin ones were used with Penitum 4's biggrin.gif)

Yeah, if it could handle a P4 and its 300W TDP, I'm sure Skylake being far less than 400W is fine. I mean, we don't see 500W CPUs anymore, so sticking to 600W or below is easy enough. thumb.gif

The wire gauge they use is AWG 18 or 16, or however it's formatted, and can churn out double digit amps completely safely. With two +12V wires and two GND wires, that's at least 20A running at 12V, or at least 240W of power without exceeding the wires' specs. That's enough for a stock FX-9590! Can't say the same for the plug or socket tolerances (but that's because I'm simply not familiar with them), but you're not making liquid copper this way.
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post #792 of 976
So while looking at the asrock z99 2011v3 boards, I found this page. It shows that the board has a pcie x4 slot already mounted to the board... All it needs is a flexible cable and you could do sound card and you with it.
https://www.techpowerup.com/mobile/reviews/ASRock/X99E-ITX_AC/5.html
7th picture in shows the slot, says mini pcie, bit it looks more like a normal pcie port.... Anyone know?
post #793 of 976
Quote:
Originally Posted by ejohnson View Post

So while looking at the asrock z99 2011v3 boards, I found this page. It shows that the board has a pcie x4 slot already mounted to the board... All it needs is a flexible cable and you could do sound card and you with it.
https://www.techpowerup.com/mobile/reviews/ASRock/X99E-ITX_AC/5.html
7th picture in shows the slot, says mini pcie, bit it looks more like a normal pcie port.... Anyone know?

Thats mini PCIE.. its not the same as X4 or even x1 AFAIK
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post #794 of 976
It's uncommon, but you do see the occasional mini PCIe slot like that. Electrically, it's a PCIe x1 slot minus the 12V pins. A dumb adapter plus a 12V power source are all you need to use standard PCIe cards with it.
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post #795 of 976
Quote:
Originally Posted by Carniflex View Post

It would be possible to put the RAM slots on the other side of the motherboard using the laptop style sticks. That would allow to still use quad channel memory in such a small from factor. Downside would be ofc that it's practically impossible to access these slots without taking the whole system apart. But it's not unheard ofc - if I remember correct select few motherboards have used M2 SSD slots "under" the motherboard. It would fit as in vast majority of cases the motherboard standoffs are at least 6 mm.

The problem is that SO-DIMMs are stacked in most instances, and even single slots are thicker than the M.2 slots, too thick for the ATX specifications. I believe that temperatures could also be an issue.
post #796 of 976
Quote:
Originally Posted by Aibohphobia View Post

LinusTechTips built a crazy system with 7 Nano's and EK made them a custom terminal so the cards could all sit next to each other with single-slot blocks installed:

https://youtu.be/LXOaCkbt4lI?t=6m27s

So now they just to make a 2-way version of that terminal and we'll be all set for Mini-DTX dual-GPU setups.

Apparently they will.
post #797 of 976
Quote:
Originally Posted by iFreilicht View Post

The problem is that SO-DIMMs are stacked in most instances, and even single slots are thicker than the M.2 slots, too thick for the ATX specifications. I believe that temperatures could also be an issue.

I dont remember from top of my head if ATX specification actually specified how long should be the motherboard standoffs be, probably not as one can see distances from about 3 mm (those little bumps and thread tapped straight into motherboard tray) all the way to ~10mm with average somewhere around 6 mm or so for the motherboard standoffs. There is probably something in the ATX standard noting the max height of components "under" the mobo ofc. However, in a case with 6mm standoff a single SO-DIMM would fit. Heat might be indeed an issue though as you noted. Although the "laptop" ram should be pretty tolerant in that regard. A few mm thermal pad between motherboard tray and SO-DIMM perhaps ...

Then again the niche, as noted already in the thread few times, might be a bit on the small side to motivate any manufacturer actually doing one of these motherboards for LGA 2011. I mean between ITX and mATX.
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post #798 of 976
ATX 2.2 Spec:
Quote:

3.4.2 Secondary (Bottom/Solder) Side Height Constraints


Required secondary (bottom) side motherboard height constraints for all areas (A-C, as shown in Figure 7)
are defined as follows (measured from the bottom planar surface of the motherboard PCB):

  • ≤0.010” – Mounting hole standoff areas – no components. Restriction applies within 0.400” square area centered on each required mounting hole location defined in Section 3.2. Nominal allowance is provided only to accommodate slight reflow solder excess.
  • ≤0.098” – All board circuit components (including leads) that are electrically conductive and intolerant of direct connection to chassis ground (e.g., through-hole leads, surface mount resistors).
  • ≤0.120” – Board components that are non-conductive or otherwise tolerant of direct connection to chassis ground (e.g., connector guide/stake pins).
  • ≤0.200” – Devices attached to the motherboard for the sole purpose of structural retention or stiffening.

A chassis and its related elements (e.g., stiffening ribs, base pan, structural supports fasteners, etc.) must allow ≥ 0.250” clearance to the bottom planar surface of the motherboard PCB. This does not including mounting hole standoffs, which may extend to and contact the PCB at the mounting holes within the prescribed 0.400”-square areas.

6.35mm is the minimum between the chassis and the bottom plane of the motherboard and that's the typical standoff height.
post #799 of 976
Quote:
Originally Posted by ejohnson View Post

I still think having the second pcie slot on a "rail system" that allows it to be adjusted from 2 slot cases to 3 slot cases would be the best universal solution. A ribbon cable that goes from the back of the mother board to the pci slot to allow for the slot to move back and forth.

This would give 100% better flexabilty in terms of itx vs dtx cases... got a itx case and just need a single card? cool, just unplug the second slot and unscrew the slider to remove it, now you have a standard itx motherboard.
Need a x1 slot and not a full x16 slots? ok, you can buy a x1 slot.

It has the best of both itx and dtx and allows the manufaturer alot of flexabilty and not locking them into a making 2 form factors. They can just make a single form factor that has expansion slot to add more.

To make it even better, you can have the slot be a m.2 form factor, that way you have even more selling points, you can plug in your m.2 ssd, or you can plug in the adapter and dtx rails and add another pcie slot, or you can leave it empty.

Its like how some monitors had sound bar mounts on them. Both parts sold individually, You can have one or not, its up to you, but the extra plastic clip to hold the sound bar on didnt add anything to the overall cost of the monitor. Adding 4 holes and a m.2 slot to the back of a motherboard wouldnt add too much to the cost, you could sell the adapters for 30 bucks and make even more money.

Going back to this idea here and how I really think this would be a great way to make mdtx without committing to another form factor.
I found this while looking at pcie riser boards.
http://xyzinformatica.com.br/produtos/placa-mae-industrial/miniitx-cr100-crm/


As you can see, its a itx motherboard, but it has plugs on the bottom of the board that allow a daughter board to be plugged in to provide more pci slots. This could be made now, but having a few board options... offer a x1 slot version and a x16 version.
post #800 of 976
Quote:
Originally Posted by ejohnson View Post

Going back to this idea here and how I really think this would be a great way to make mdtx without committing to another form factor.
I found this while looking at pcie riser boards.
http://xyzinformatica.com.br/produtos/placa-mae-industrial/miniitx-cr100-crm/


As you can see, its a itx motherboard, but it has plugs on the bottom of the board that allow a daughter board to be plugged in to provide more pci slots. This could be made now, but having a few board options... offer a x1 slot version and a x16 version.

Might as well just make it a m-DTW board IMO just as much R&D I would imagine
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