PC Cases that have space to install "3rd" gpu

Tom M
Tom M
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Topic 227015

I think I have come up with a couple of examples of MB combos that will let me run 3 double wide gpus directly on the motherboards.

However, I have had a long-time problem with a dirty computing environment.

The 3rd GPU (double wide+) hangs off the far edge of the motherboard and (usually) runs directly into the PSU.  Then means you can't put a double-wide GPU in that last slot.

Is there a PC case on the market that makes that space available without using a riser or other trickery?

Tom M

A proud member of the O.F.A. (Old Farts Association)

My other CPU is a Ryzen 3950x

Peter Hucker of the Scottish Boinc Team
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Why "no trickery"?  There are

Why "no trickery"?  There are ways to get round it.  For example I've mounted the PSU further forwards.  And risers aren't a problem with Boinc projects.  You don't need all the lanes to the GPU.

 

But you could buy a very tall tower case which is designed to take two PSUs, if you're only using one PSU, you'd have a nice gap where you want it.  This is an Antec 1900, but I don't know if they make those any more.  Search for other dual PSU cases.

 

Tom M
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Peter Hucker wrote: Why "no

Peter Hucker wrote:

Why "no trickery"?  There are ways to get round it.  For example I've mounted the PSU further forwards.  And risers aren't a problem with Boinc projects.  You don't need all the lanes to the GPU.

But you could buy a very tall tower case which is designed to take two PSUs, if you're only using one PSU, you'd have a nice gap where you want it.  This is an Antec 1900, but I don't know if they make those any more.  Search for other dual PSU cases.

My problem is I have discovered at least one X570 MB that will not support risers.   And I haven't (yet) tested the current target MB to see if it will.  Most of my MB's have supported risers.

If it will, then I may have a workaround except for the bottom line.  I need a fully enclosed case due to dirty environment (dust and other garbage) apparently.  I am not sure I can fit a vertical gpu with the two horizonal ones.

Where did you find that two PSU case?  I wonder if its within my budget reach.

Tom M

A proud member of the O.F.A. (Old Farts Association)

My other CPU is a Ryzen 3950x

Peter Hucker of the Scottish Boinc Team
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I've never known a board not

I've never known a board not support risers.  AFAIK it just makes the GPU look like a single lane GPU.  I've experienced no slowdown on WUs from a variety of Boinc projects.

I too have a very dusty environment - parrots!  I'm constantly blowing dust out of heatsinks.  Being inside a case doesn't help one bit.  You'd need a case with very fine filters.

That case is probably no longer made unless you can get a second hand one.  It was several years ago I bought one (for a build for someone else).

Try looking at these:  https://pcmecca.com/biggest-pc-cases/

Keith Myers
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I fit 3 double wide gpu in my

I fit 3 double wide gpu in my Phanteks 719 case with no issues.  Like Peter says a taller case, preferably an older model that doesn't use the trendy psu cover will fit 3 gpus easily.

Easier still is using any case with a horizontally mounted motherboard.  Like my Thermaltake X9, X5 and Level 20XT cases.  Same case for the old Corsair XB  EVO or the Corsair Air 540 cases.

I also have two Corsair Air 540 cases.  Just turn them on their side to make the motherboard horizontal.

 

Ian&Steve C.
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Peter Hucker wrote:I've

Peter Hucker wrote:

I've experienced no slowdown on WUs from a variety of Boinc projects.

most BOINC projects don’t have a slowdown, but one in particular does have a slowdown, GPUGRID. But it’s an Nvidia-only project since they only have CUDA apps. But it needs at least PCIe 3.0 x4 to get full speed. 

USB risers are less stable because the usb cables are usually junk and not properly shielded. If you at least replace the USB cables with higher quality ones you’ll have some better stability. But I still prefer to avoid the USB style risers in general due to stability and bandwidth issues since I contribute to GPUGRID occasionally. Less wire clutter too. 

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Tom M
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Yes, this Asus ROG b450-f

Yes, this Asus ROG b450-f Strix does work with ribbon cable risers (2 out of 3 long slots teste, 2 & 3 work).

So if I can figure out how to shoehorn all of it into my current Phanteks case and close up the side and it doesn't get too hot I have it solved.  Maybe.

I gave my Grandson a Corsair cube that he is now not using.  I will take a look.  Maybe I can buy it back for less then a new one.

Tom M

A proud member of the O.F.A. (Old Farts Association)

My other CPU is a Ryzen 3950x

Peter Hucker of the Scottish Boinc Team
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Ian&Steve C. wrote:most BOINC

Ian&Steve C. wrote:

most BOINC projects don’t have a slowdown, but one in particular does have a slowdown, GPUGRID. But it’s an Nvidia-only project since they only have CUDA apps. But it needs at least PCIe 3.0 x4 to get full speed. 

USB risers are less stable because the usb cables are usually junk and not properly shielded. If you at least replace the USB cables with higher quality ones you’ll have some better stability. But I still prefer to avoid the USB style risers in general due to stability and bandwidth issues since I contribute to GPUGRID occasionally. Less wire clutter too. 

Not sure what you mean by less wire clutter - you simply cannot put multiple GPUs on the motherboard, they won't fit, unless you have very expensive watercooling, which I think it's you that has done.

Maybe it's biology on GPU that does more data transfer, because folding at home needs fast links too.

I don't know what quality my USB cables are, I bought a pack of ten cables and riser boards from a minor selling them second hand.  They have no stability problems at all, my troubles were the GPU power connectors, they oxidise very easily and need replaced.  Trouble is when the card's sockets oxidise, I have to bypass them by hardwiring with some electric shower cable like this!:

Ian&Steve C.
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Peter Hucker

Peter Hucker wrote:

Ian&Steve C. wrote:

most BOINC projects don’t have a slowdown, but one in particular does have a slowdown, GPUGRID. But it’s an Nvidia-only project since they only have CUDA apps. But it needs at least PCIe 3.0 x4 to get full speed. 

USB risers are less stable because the usb cables are usually junk and not properly shielded. If you at least replace the USB cables with higher quality ones you’ll have some better stability. But I still prefer to avoid the USB style risers in general due to stability and bandwidth issues since I contribute to GPUGRID occasionally. Less wire clutter too. 

Not sure what you mean by less wire clutter - you simply cannot put multiple GPUs on the motherboard, they won't fit, unless you have very expensive watercooling, which I think it's you that has done.

Maybe it's biology on GPU that does more data transfer, because folding at home needs fast links too.

I don't know what quality my USB cables are, I bought a pack of ten cables and riser boards from a minor selling them second hand.  They have no stability problems at all, my troubles were the GPU power connectors, they oxidise very easily and need replaced.  Trouble is when the card's sockets oxidise, I have to bypass them by hardwiring with some electric shower cable like this!:

stability means stability running PCIe gen 3.0. If you’re running lower gens they have less issues. But getting them 3.0 needs proper shielding on the cables and you can experience random dropouts. I did this a while back before transitioning to ribbon cables. 
 

less wires because USB risers need to be powered externally. Ribbon risers transfer power from the motherboard through the riser itself. Just less clutter overall. 
 

 

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gordonbb
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tom m wrote:Is there a PC

tom m wrote:
Is there a PC case on the market that makes that space available without using a riser or other trickery?

Any "XL" ATX Full tower should work. The main difference is going from 7 to 8 or 9 supported expansion slots.

Models that come to mind:

Fractal Define XL

Fractal Meshify 2 XL

Lian Li O11 Dynamic ROG XL

Phanteks Enthoo-Pro

 

 

Peter Hucker of the Scottish Boinc Team
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Ian&Steve C. wrote:stability

Ian&Steve C. wrote:

stability means stability running PCIe gen 3.0. If you’re running lower gens they have less issues. But getting them 3.0 needs proper shielding on the cables and you can experience random dropouts. I did this a while back before transitioning to ribbon cables. 
 

less wires because USB risers need to be powered externally. Ribbon risers transfer power from the motherboard through the riser itself. Just less clutter overall. 
 

 

Oh that looks nice.  But it depends how you arrange things.  I'm a collector of old cheap parts.  I tend to end up with various GPUs sat on the shelf next to the computer, so the extended distance with a thin flexible wire is an advantage.  When I can afford loads of GPUS, I'll probably have them in a custom made rack with a PSU in it to power the GPUs and risers, so that should be neat enough.  I think in the past I've used about 50% V2 and 50% V3 and they all worked.  If I have a problem I assume I can add shielding to the wires, or buy some nice shielded ones somewhere?

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