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Mini-DTX Hype Thread (ITX with two PCIe slots!) - Page 81

post #801 of 979
That's actually really cool. Takes a socketed laptop processor (Sandy or Ivy) and runs the QM77 chipset. It's for embedded systems and workstations I think, at least judging by the chipset and the ports.
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post #802 of 979
Quote:
Originally Posted by KaffieneKing View Post

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

I don't think it would, they would just need to split off 8x from the main pci slot and include a bios option to turn it on.
Asrock already has the bios option to split the x16 into dual x8 via a riser card. I think this would be way cheaper than making a mdtx board and a mitx board (from a manufacturing standpoint)

The mdtx market is small, very very small. The mitx market is big and there is no reason to make a mdtx board... but making a convertible board would have all the mdtx people, and if it would double as your mitx board... so you capture 2 sections of the market with a single product.
Edited by ejohnson - 2/3/16 at 11:03am
post #803 of 979
thinking.gif I didnt think about it from a manufacturing point of view, you are probably right it would be cheaper!
post #804 of 979
I really think some manufacturers need to look at something like this as a option. So many 2 and 3 slot itx cases out there that go un-optimized.

With this they could even cut out some of the smaller matx boards. Just offer a mitx with a expansion port on the bottom. Then allow you to add daughter boards to fit your needs. Got a 4 slot matx case and you want a gpu, sound card and tv tuner... perfect, here is a daughterboard that gives you a pair of x1 slots for your sound and tv.

I know asus had the "expander" this is a picture of 3 expander boards daisy chained.. The idea was there, but the design was poor . It required special case just to work.
post #805 of 979
BIOS? Just use a jumper - that's even easier!
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post #806 of 979
post #807 of 979
That is pretty cool(even if it is only x1 per slot[so not SLI/Xfire friendly]). Even more so if a user needs PCI for older hardware.

Looks like bridge chips are onboard the expansion boards.

They still may be too wide for many mDTX cases.
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post #808 of 979
Thread Starter 
Any kind of riser breaks compatibility with just about all cases. Keeping the first slot and having an 8x slot off to the side is viable, but a lot of work to keep inside the mITX form factor when extending the board to the second slot would be so much easier and cheaper.
post #809 of 979
Quote:
Originally Posted by Dyson Poindexter View Post

Any kind of riser breaks compatibility with just about all cases. Keeping the first slot and having an 8x slot off to the side is viable, but a lot of work to keep inside the mITX form factor when extending the board to the second slot would be so much easier and cheaper.

See this post, its been done before, someone just needs to do it again.

Quote:
Originally Posted by ejohnson View Post

More info on that expandable mitx board....

http://www.dfi.com.tw/Upload/PressHeader/2148/Html/CM100-C_AMD_R-series_A70M_Mini-ITX_eComal2.html
post #810 of 979
Quote:
Originally Posted by ejohnson View Post

See this post, its been done before, someone just needs to do it again.

If I had to guess, I'd say Dyson saw your previous post but was basically saying "It's not really worth it as just running another 1/2 of PCB would be cheaper and easier."

The reason the board you linked works at all is because the two 1x "expansion" slots are on either side of the 16x slot, which is space that already exists in the mITX standard. Fitting an 8x lane would be very difficult. Actually, the only way I think it'd work is by adding some kind of very thin and probably very fragile proprietary connector on the back of the board. If you go that route, fitting said connector in the 6mm defined in the mITX standard (for standoff length) would be rather difficult. Even then, you don't guarantee compatibility, as some manufacturers use shorter standoffs (I have a handful of 4 and 5mm standoffs I got out of cases. From a design perspective, it'd be immensely easier (and probably notably cheaper) just to produce a slightly larger PCB and run the traces for the extra slots.
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