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Samsung 905 pro M.2 in an ASUS X99-Deluxe II w/ i7-5820K and 2 GPUs in Crossfire

post #1 of 7
Thread Starter 
Hi.

I am new to this forum so I hope I am posting this in the correct place.


I am gathering parts for a new build and am about to purchase an ASUS X99-Deluxe II. I already have settled on an i7-5820K and am aware that it is limited to 28 PCIe lanes. Since buying the CPU, I have become very interested in getting a Samsung 905 Pro M.2 drive. I am looking at the manual for the X99-Deluxe II and see that if I use 2 GPUs, they will be limited to x16x8. I am OK with that.

The manual shows that for a 40-lane CPU, the M.2 and U.2-1 ports share BW with PCIEX16-3 and U.2-2 shares BW with PCIEX16-5. In the 28-lane CPU diagram, the M.2 and U.2 headers are not mentioned at all. I see that the MOBO comes with an onboard M.2x4 bracket and a Hyper M2.x4 Mini card to mount in a PCIe slot. My question is with the 28-lane i7-5820K, can I achieve a setup on the X99-Deluxe II MOBO that will give me 4 full lanes for the Samsung 950 Pro, while using 2 GPUs in Crossfire? If not, can I get 4 full lanes for the 950 Pro if I just have 1 GPU? The GPUs are ASUS R9-380s.

If this can be done (with 2 or 1 GPU), can I use the onboard M.2 bracket and header or do I have to use the Hyper M.2x4 Mini Card or does it not matter? Is it possible at all, and if so, what PCIe slots do I plug in the GPUs and the Hyper M.2x4 card (if that is what I have to use to do it).

I read on another forum that you can do it, but not for this particular MOBO. It may be a limitation of how the MOBO shares PCIe bandwidth. It worries me because in the X99-Deluxe II manual, the PCIe lane allocation diagram for a 28-lane CPU does not even show or list the M.2 header or either U.2 header, which are clearly shown on the 40-lane CPU PCIe diagram.

Kind of wishing I had sprung for a 40-lane CPU but I was not considering a 4-lane M.2 drive when I bought the i7-5820K, plus I got it for a really great price.

Thanks in advance for any responses.
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Speedy IV
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post #2 of 7
On the x99 Deluxe, you can use PCIE slots at 16x and 8x and still have 4 pcie 3 lanes for the m.2 slot (using the m.2 slot turns one of the pcie 3.0 slots into a pcie 2.0 x1 slot). It *appears* like the deluxe 2 is configured the same way, but the documentation doesn't explicitly state.
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post #3 of 7
Thread Starter 
Thanks for your response. I still have not found a definite answer to this. I THINK if I put the 2 GPUs in slots 1 & 3, they will run in x8x8. Then if I put the 950 Pro on the included Hyper M.2 Card and plug that into slot 4, it SHOULD get 4 lanes allocated to it. You can put 3 GPUs in 3-way by using slots 1, 3, & 4 and run them at x8x8x8 (per the manual). I would just put the 950 Pro on the Hyper M.2 card in slot 4 and end up with x8x8 for the 2 GPUs and x4 for the 950 Pro (I hope).

Anyone know for sure?

Also, I have noticed that ASUS changed the PCIe slot arrangement on the X-99 Deluxe II verses the X-99 Deluxe and X-99 Deluxe/USB3.1. On the X-99 Deluxe, physical slot 3 is PCIe 3.0/2.0x16 and physical slot 4 is PCIe 2.0x16. On the X99-Deluxe II, its the other way around - physical slot 3 is now PCIe 2.0 x16 and physical slot 4 is PCIe 3.0/2.0x16.

The Manual for the X99-Deluxe II says for 3-way, use PCIe x16 slots 1, 3, & 4 (physical slots 1, 4 & 5). I don't understand this arrangement because physical slots 4 & 5 are right next to each other. It seems like 2 dual-slot form factor GPUs would not fit next to each other in those 2 slots. Is this incorrect ? I read another post from a guy complaining about this change. He said you had to put the 3 GPUs in slots 1, 3, & 5 (physical slots 1, 4, & 6) and that the 3rd GPU would completely block the case I/O headers (which it would). Also, the GPUs would be unevenly spaced. He was going to use an EVGA Pro SLI connector that is rigid, housed in an aluminum case, and couldn't because of the uneven GPU spacing. Is he correct in saying to use slots 1, 3, and 5 verses the manual which says use slots 1, 3, and 4?

Finally, slot 2 used to be PCIe 2.0 x 4 and now on the X-99 Deluxe II it says PCIe 2.0 x1. Is this a downgrade?
Why did ASUS change the PCIe slot arrangements?

Thanks !
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Speedy IV
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post #4 of 7
You can go a few ways...

The slot under the x1 (third physical slot) can be configured for up to x4. It changes some of the available USB options... but you can use that with an adapter + m.2 drive and still retain the lanes for your gpu's. You would lose one of the usb 3.0 header on the motherboard and it also affects I believe two back panel ports (they run at 2.0 instead of 3.x).

In my case I have my sound card in that slot because I can't fit it in the x1 slot due to my gpu.

Beyond that if you need the slot I mentioned like I do...

You are going to have to think slot arrangement like a 3 gpu setup. If you use the built in m.2 slot your 2nd gpu would have to use the "third" x8 slot. Because with a 28 lane cpu that slot will be disabled. On a 40 lane cpu it would still have x8... the manual isn't really useful with this information because the 28 lane part is wrong....

If you want to set your gpu's up in the first and fourth physical slots... then you would need to use an adapter once again and set the m.2 drive up in the last slot shown for the 3x gpu setup.

For my setup I am using a 5820k with an Intel 750 U.2 drive and a Samsung M.2 drive. In the actual bios somewhere it 100% tells you that the related PCIE slot will be entirely disabled with the 28 lane cpu. I have a sound card and of course my gpu...

So I am pretty much in the same boat if I want to add a second gpu. You are also correct about two of the slots being ungodly close together. I can't even fit my sound card in the x1 slot... and my gpu is an AMD Fury X with an EK block aka a single slot solution... my sound card was hitting the bottom of the video card so I couldn't secure it and I've never had that issue before. So I find it impossible to believe that physical slots 4/5 would really fit most video cards.

Anyway for my setup the Deluxe II has been really good. The only real issue I've had is the Aura software being weird and not working correctly. All the Z170 Aura boards I've used didn't have issues.

*edited to add* I am not sure about the person saying the manual was wrong about the 3 card setup. Based on various things in the manual I believe that the last slot is only really used for a 4 card set up... its also the slot that is shared with the other u.2 slot. Which it seems from the manual doesn't serve any purpose on the 28 lane cpu's. Its hard to say for sure as there are definitely some errors in the manual.
Edited by Digitalwolf - 6/13/16 at 7:49pm
post #5 of 7
Thread Starter 
Thanks for your response. So there IS another person on the planet with an X99-Deluxe II and a 5820K !

If I understand what you are saying, you are in agreement that the way to do this is to put the GPUs in physical slots 1 & 4, running in x8x8 and the 950 Pro on the M.2 Hyper card in physical slot 5. Is that correct ? Physical slot 4 is PCIe x16 #3 which (according to the manual) shares BW with the M.2 header and U.2-1. That is OK since I am not planning to use either one of those (I don't think I can).

You said that you have a 5820K, an Intel 750 and a Samsung M.2 - I assume a 950 Pro?, 1 GPU, and a sound card. You also say the BIOS states that the related PCIe slot will be entirely disabled with a 28-lane CPU. Which physical slot are your referring to and under what conditions? Do you have the 750 in U.2-1 and the Samsung M.2 in the M.2 header (ie not on the Hyper M.2 card) in a PCIe slot? I could see where that would take all lanes from physical slot 4. Physical slot 3 is listed as PCIe2.0x16 only so I had planned to just not populate that slot at all.

Regarding the spacing problems, the AMD Fury X is a dual-slot card (as far as I can tell by looking at a picture). I don't understand why you say the Fury X is a single slot solution. Do you mean that it is a single-slot form factor or that you just have 1 GPU? I have 2 ASUS R9 380s which are definitely dual-slot and pretty beefy cards. I really doubt that they would fit side by side in physical slots 4 and 5 - which is where the manual says to put them for a 3-way set up. I am not really concerned about that since I am only trying to do a 2-way GPU set up with 1 950 Pro. I am pretty sure I can't do that and use the M.2 header because it shares BW with physical slot 4 and I think it gets disabled if you put something (a GPU in my case) in that slot. The clearance between physical slots 4 & 5 are not an issue for me as I am not planning to do a 3-way GPU set up. I asked because I don't see how it physically could be done due to the spacing between slots.

In the other post I referred to, the guy said he had to put the 3rd GPU in physical slot 6, which totally blocked the case I/O headers. I understand that problem but I don't understand why he was using physical slot 6 because that slot is not what the manual says and it is listed as PCIe 2.0x16 only. Maybe because the 3rd GPU won't fit in physical slot 5 when GPU # 2 is in physical slot 4...

Anyway, to get back on point, do you think I can do what I said above - put GPU 1 in physical slot 1, GPU 2 in physical slot 4 and the 950 Pro on the Hyper M.2 Card in physical slot 5 and end up with the GPUs in x8x8 and the 905 Pro getting a full 4 lanes?

It's interesting that you are finding errors in the manual. You say the information about the 28-lane scenario is wrong. Can you elaborate on that?

THANK YOU very much for your response !
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Speedy IV
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post #6 of 7
Here is a picture...




When you use an EK block like I have the Fury X is a single slot solution. On the Deluxe II some of slot spacing seems a bit off from other boards that I have... As I have Asus Z170 boards that I can fit my ZXR into the x1 slot directly under the first PCIE x16 slot with no issue. In the case of the Deluxe II I cannot do this as noted in my original post.

I have a Samsung 951 nvme version in the M.2 slot and an Intel 750 in the U2_2 slot which share BW with PCIe x16 3. On the 28 lane cpu PCIe x16 3 is entirely disabled when you set the bios setting for U2_2. On a 40 lane CPU that slot would still run at x8. (I do have 950 Pro's as well but they are in a raid 0 on a z170 board).

Some examples of what seem to be or definitely are errors:

In the start of the manual it shows U2_1 running off PCIe x16_5 for a 40 lane cpu and off PCIe x16_4 for a 28 lane cpu. This is listed in the X99-Deluxe II specs summary page. (manual page ix and this information is at the bottom of expansion slots)

In the bios section you will notice that there is an actual PCIe x16_5 BW setting... x2 mode or x4 mode. X2 mode locks PCIe x16_5 to run in x4 mode and enables U2_1. X4 mode disables U2_1 and allows this slot to run at x8 mode. There is never again any mention of U2_1 being able to run off PCIe x16_4 for a 28 lane cpu.... (page 3-24 in bios setup).


In Chapter 1 starting on page 1-9 you will find the 40 Lane CPU BW allocation chart which is correct.

On page 1-10 you will find the 28 Lane CPU BW allocation chart. The error is in the listing for PCIe x16_3 where it has two columns listed as USB3.1-EA34 and SATA Express. The columns should actually be M.2 and U2_2... Which is where you should be informed that without either device in use you will have a default lane assignment of "insert that number here". While having those devices in use will actually disabled slot PCIe X16_3 with a 28 lane CPU. Instead you are being told information about USB headers... that has nothing to do with this slot regardless of devices in use.... In the actual bios there is a setting for U2_2 BW. It only has two settings... Auto or U.2_2. In the BIOS it will actually inform you that PCIe X16_3 will be entirely disabled when you have a 28 lane CPU installed (at least mine displays this on bios 601).


**** back on point ***


You can set your hardware up as you listed in your response to me. Or you could drop the GPU down a slot and use the M.2 port as you would still get the same lane assignments... (x8, x8, x8 even tho the M.2 drive only uses x4).

Or if you aren't going to use PCIe x16_2 you can put the M.2 card there with an adapter (the slot I'm using for my sound card). You can assign PCIx16_2 x4 mode. If you do that what happens is the USB 3_34 header on the motherboard drops to USB 2.0 (but you can still use usb3_12 which is just to the right of it) and USB 3.1 EA34 (listed as item 8 in the rear connectors image on manual page 2-16) will be disabled (mangual page 3-23).

So you have a few options.. it just depends on where you want to put things and/or what you can give up.

*edit to add* In my image the card you can see at the very bottom is the daughter board for my ZxR sound card. It doesn't use an actual slot just needs a mounting space. However... that will give you an idea of how much room is between where you mount the first GPU and the very bottom slot.... and the PCIe x16_3 slot is just under my sound card for reference.
Edited by Digitalwolf - 6/14/16 at 4:12am
post #7 of 7
Thread Starter 
Thanks for your response. With all those PCIe lane eating M.2 and U.2 cards you have, I would think you would have a 40 lane CPU for sure ! I have since acquired the case, PSU, and a Samsung 850 Pro. I already have the Asus R9-290s. So I am going to face PCIe lane limitations with a 28 lane CPU on any high end X99 MOBO but it looks like I can do what I want to do and go dual Crossfire and add in a 950 Pro on the Hyper Card to one of those slots, and get all 4 lanes to it while not disabling something somewhere else that I care too much about.

I have been looking around at other High End X99 MOBOs - Gigabyte, AsRock, EVGA and they all seem to have even more challenging PCIe lane allocation constraints Then the Asus X99-Deluxe II. So, I think I will take the plunge with the X99-Deluxe II, or maybe the X99-AII, or maybe the X99-Deluxe/USB3.1....

I bought GKill Trident Series DDR4-3333 (F4-3333C16Q-32GTZB) which is typically Z170 stuff but it's a kit and should run in DDR4 on the X99-Deluxe II. It' listed in the latest QVL and I paid extra for that 3333 rating. I am hoping for a smooth build and very stable baseline . From there I will start heating it up.

Will post when I acquire a MOBO. In the mean time, thanks again for the detailed response and the pic. That's a nice looking rig and I see what you mean about the EK block and the tight fit with the sound card. Those Asus R9 290s are really beefy. I am probably going to have a fight getting them both in there. At least I am not going 3-way (yet).
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