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Author Topic: X99 PCIe lane switching  (Read 22625 times)

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flobelix

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« Reply #50 on: 09-July-16, 13:05:34 »

The layout decision is bad and was much criticized. However it is that way on all MSI X99 boards below Gaming 9/Xpower series except for the X99A Raider. You can still use an SLI setup without any problem populating E1 and E5 like suggested. x8/x8 will not hit the performance in a noticeable way.
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strike

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« Reply #51 on: 11-July-16, 05:13:13 »

Yes 93C is quite bad, and better to move cards around to get them at x8/x8 but with lower temps.
The layout decision is bad and was much criticized. However it is that way on all MSI X99 boards below Gaming 9/Xpower series except for the X99A Raider. You can still use an SLI setup without any problem populating E1 and E5 like suggested. x8/x8 will not hit the performance in a noticeable way.
Thanks for the help and honesty guys! I switched slots and now there's a difference of about 5°C instead of 20°C. So I'm happy with that. Although I wonder what the performance difference between x16/x16 and x8/x8 looks like. Someone who buys a system like this probably wants all the performance they can get. :-P)
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flobelix

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« Reply #52 on: 11-July-16, 16:44:54 »

The difference is about 0 - 1%
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naveeed

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« Reply #53 on: 10-August-16, 22:54:29 »

Dear all,
I have a pc with following specification.


X99A GAMING PRO CARBON
Bios : 1.2.
INTEL 6800K
CORSAIR H100I COOLER

SAMSUNG SSD 512GB
32GB CORSAIR RAM
1200W PSU
ASUS GTX 980TI X 2
WINDOWS 10 / 106
Nvidia Drivers. Ver. 368.81

TWO MAJOR ISSUE FACING.
1. BOTH GPUs working at x8 Speed.
(Installed 6900K CPU,Which is 40 Lanes,Tested with

two X99A GAMING PRO CARBON Motherboards,
Still the same issue,
2. In Nvidia Control Panel. The first GPU on PCIE1

shows as second GPU & on E5 shows as Primary (No.1)

GPU.
As I feel The GPU#1 on PCIE1 should show #1.

Earliest help is anticipated,
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badboy2k

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« Reply #54 on: 11-August-16, 04:48:13 »

Dear all, I have a pc with following specification. X99A GAMING PRO CARBON Bios : 1.2. INTEL 6800K CORSAIR H100I COOLER SAMSUNG SSD 512GB 32GB CORSAIR RAM 1200W PSU ASUS GTX 980TI X 2 WINDOWS 10 / 106 Nvidia Drivers. Ver. 368.81 TWO MAJOR ISSUE FACING. 1. BOTH GPUs working at x8 Speed. (Installed 6900K CPU,Which is 40 Lanes,Tested with two X99A GAMING PRO CARBON Motherboards, Still the same issue, 2. In Nvidia Control Panel. The first GPU on PCIE1 shows as second GPU & on E5 shows as Primary (No.1) GPU. As I feel The GPU#1 on PCIE1 should show #1. Earliest help is anticipated,

that board is electrically wired the same as the X99S SLI Plus so 1 and 5 are on shared lanes off slot 1's x16 lanes so its splitting them x8 - x8!

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Motherboard: MSI 790FX-GD70 (bios 1.17) AM3
Processor:AMD phenom IIx4 955 black edition 3.2GHz processor(Clock speed of 4GHz)
Cooler: corsair H100 cooler
Ram: 16GB Corsair Dominator DDR3 1600MHz ram (2 dual channel kits model: CMP8GX3M2A1600C9) (underclocked at 1333MHz)
GPU: 1: MSI R7870 -2GD5T/OC @ 1155mhz , 2: MSI R7850-Twin Frozer 2GD5/OC @ 925mhz
PSU: Thermaltake tougthpower 1500W (+12v1 20A, +12v2 20A, +12v3 40A, +12v4 40A) (+12v1=20+4 connector, +12v2=CPU power, +12v3=PCI_E connections, +12v4 = molex+sata+PCI_E connectors  )
Extras: 1 x 4 port raid card (model SIL3114) ASUS Xonar Essence STX sound card PCI-E X1.

naveeed

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« Reply #55 on: 11-August-16, 07:34:50 »

that board is electrically wired the same as the X99S SLI Plus so 1 and 5 are on shared lanes off slot 1's x16 lanes so its splitting them x8 - x8!


Thanks for your quick reply.

If I connect DP/HDMI Cable to GPU #1, it take as above image.
If I connect DP/HDMI Cable to GPU #2, it take as Primary GPU.
Any clues why the GPU #2 taking as Primary.

Regards
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badboy2k

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« Reply #56 on: 11-August-16, 07:49:45 »

i think that is a NVIDIA thing to offload the bulk of the display outs to the lower card to keep temps more even when they are used in SLI as the lower card will be cooler then the top one so moving the driving of displays to the lower reduces the heat of the upper card as its just a compute engine only and the cooler card has more headroom for the extra heat a display out generates as its extra processing for the signal!

i do not think that can be changed to flip them back around! (most boards for years from MSI have been like that where the lower is set as primary)
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OS: Windows7 professional SP1 64bit (OEM)
Motherboard: MSI 790FX-GD70 (bios 1.17) AM3
Processor:AMD phenom IIx4 955 black edition 3.2GHz processor(Clock speed of 4GHz)
Cooler: corsair H100 cooler
Ram: 16GB Corsair Dominator DDR3 1600MHz ram (2 dual channel kits model: CMP8GX3M2A1600C9) (underclocked at 1333MHz)
GPU: 1: MSI R7870 -2GD5T/OC @ 1155mhz , 2: MSI R7850-Twin Frozer 2GD5/OC @ 925mhz
PSU: Thermaltake tougthpower 1500W (+12v1 20A, +12v2 20A, +12v3 40A, +12v4 40A) (+12v1=20+4 connector, +12v2=CPU power, +12v3=PCI_E connections, +12v4 = molex+sata+PCI_E connectors  )
Extras: 1 x 4 port raid card (model SIL3114) ASUS Xonar Essence STX sound card PCI-E X1.

jidri.luks

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« Reply #57 on: 04-September-16, 22:39:41 »

that board is electrically wired the same as the X99S SLI Plus so 1 and 5 are on shared lanes off slot 1's x16 lanes so its splitting them x8 - x8!



I got the issue with my PC like that. I have
i7 5820k
2x MSI R9 390 G8 Gaming
MSI X99A Gaming 7
I use pci-e1 and pci-e 5 and Bios says vga in slot 1 is running at x4 and in slot 5 is running at x8. If I use only one card in first slot, speed is x8, in slot 2 is it x8, not x16 and both cards as I wrote x4/x8  pci-e1/pci-e5. I dont have m.2 ssd and no sound or other pci card. I took both cards to my friend, he has 5820k and same MB. we didnt try CF but both cards single in pci-e1 run at x16, Is my motherboard damaged? And more.....Board Explorer in Bios says, I got all 8 RAM slots empty. I got there 6x8 GB Kingston 2666 mhz ddr4, and today, I was forced to clear CMOS, i did it 20 times and PC still didnt turn on, after 2 hours of trying I find issue, 2 dead ram modules.... Can someone help me figuree it out? Or its tottaly lost, and i would like to claim a warranty. (sorry for my English). I hope everyone understand.
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Svet

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« Reply #58 on: 05-September-16, 12:40:34 »

@jidri.luks
if you are looking for troubleshooting, please open new own topic and also provide details system specs,
see >>Posting Guide<<
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rgiarusso

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« Reply #59 on: 07-November-16, 23:13:47 »

Planning out a build and trying to figure out how to go about configuring everything properly (if I need custom BIOS).

Intel i7-6850K (40 PCIe Lane)/MSI X99A Gaming Pro Carbon
2 MSI GTX 1070s, 10Gb Networking Card, MSI GT 710, and Samsung 950 Pro M.2 SSD.

Trying to get the following config:
PCI_E1: x8 - GTX 1070
PCI_E3: x16 - GTX 1070
PCI_E5: x8 - 10Gb Networking
PCI_E6: x4 - GT 710
M.2_1: x4 - SSD

Is this even possible?
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badboy2k

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« Reply #60 on: 08-November-16, 00:03:12 »

Planning out a build and trying to figure out how to go about configuring everything properly (if I need custom BIOS). Intel i7-6850K (40 PCIe Lane)/MSI X99A Gaming Pro Carbon 2 MSI GTX 1070s, 10Gb Networking Card, MSI GT 710, and Samsung 950 Pro M.2 SSD. Trying to get the following config: PCI_E1: x8 - GTX 1070 PCI_E3: x16 - GTX 1070 PCI_E5: x8 - 10Gb Networking PCI_E6: x4 - GT 710 M.2_1: x4 - SSD Is this even possible?

that is Not possible! if you use a M.2 drive on that board the bottom X8 slot will be switched off and have Zero Lanes!
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OS: Windows7 professional SP1 64bit (OEM)
Motherboard: MSI 790FX-GD70 (bios 1.17) AM3
Processor:AMD phenom IIx4 955 black edition 3.2GHz processor(Clock speed of 4GHz)
Cooler: corsair H100 cooler
Ram: 16GB Corsair Dominator DDR3 1600MHz ram (2 dual channel kits model: CMP8GX3M2A1600C9) (underclocked at 1333MHz)
GPU: 1: MSI R7870 -2GD5T/OC @ 1155mhz , 2: MSI R7850-Twin Frozer 2GD5/OC @ 925mhz
PSU: Thermaltake tougthpower 1500W (+12v1 20A, +12v2 20A, +12v3 40A, +12v4 40A) (+12v1=20+4 connector, +12v2=CPU power, +12v3=PCI_E connections, +12v4 = molex+sata+PCI_E connectors  )
Extras: 1 x 4 port raid card (model SIL3114) ASUS Xonar Essence STX sound card PCI-E X1.

rgiarusso

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« Reply #61 on: 08-November-16, 00:25:07 »

Is there any way to run all four slots plus M.2 on this board?  Or is there another MSI board that could do this?
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flobelix

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« Reply #62 on: 08-November-16, 11:36:22 »

Four slots + M.2 @ x4 is not possible on any MSI X99 board or on any other X99 board I know. MSI already has one of the most flexible solutions for X99 boards. Four slots is possible but M.2 will than just use the PCH's 2.0 x2 lanes.
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rgiarusso

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« Reply #63 on: 08-November-16, 12:50:54 »

I think I've found a solution, at least for my case.

 X99S XPower Gaming Titanium, according to its manual, will support a 3-Way SLI config for a 40-lane CPU of:
PCI_E1 - 3.0 x8, enough for a GTX 1070
PCI_E2 - 3.0 x8, enough for a GTX 1070
PCI_E3 - 0
PCI_E4 -  3.0 x16, enough for a 10Gb Network card
PCI_E5 - 2.0 x 1, enough for a GT 710 (it's just running a 5" terminal display)
PCI_E6 - 0 
M2_1 -  3.0 x4, enough for a Samsung 950 Pro M.2 SSD

I'm just worried about airflow over the SSD, but from the looks of the chart, I think I could just swap in a U.2 drive instead.

Am I completely nuts here or could something like this actually work?
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flobelix

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« Reply #64 on: 08-November-16, 13:14:51 »

All XPower boards share the same basic layout (X99A XPOWER GAMING TITANIUM, X99S XPOWER AC, X99A XPOWER AC). With it your updated layout would theoretically work. The GT 710 would even fit physically in the x1 slot because it's rear on this board apparently open to fit longer cards. Considering bandwith 2.0 x1 would be enough for your task for it. 



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Core i7 7820X @ 4200.95 MHz (42 * 100.02 MHz, fixed all cores), 1.088v
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32GB (4 x 8GB) Corsair CMK32GX4M4C3000C15R @ 1500 MHz (DDR4-3000), 15-17-17-35-2t 1.35v
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FlangeMonkey

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« Reply #65 on: 06-December-16, 17:12:17 »

Do you have any high level diagrams like this for the newer X99a boards?

I'm looking at the Tomahawk and notice it switches on the first PCIe and shares bandwidth with the x8 port.
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flobelix

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« Reply #66 on: 06-December-16, 18:49:35 »

Open an own thread for a particular question about the Tomahawk.
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MSI X299 Gaming 7 ACK (MS-7A90) Bios 1.5 
Core i7 7820X @ 4200.95 MHz (42 * 100.02 MHz, fixed all cores), 1.088v
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32GB (4 x 8GB) Corsair CMK32GX4M4C3000C15R @ 1500 MHz (DDR4-3000), 15-17-17-35-2t 1.35v
MSI Radeon RX Vega 64 WAVE 8G
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msi

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« Reply #67 on: 13-June-17, 14:01:38 »

On the X99S Gaming 7 where PCI_E2 and PCI_E4 1x slot are connected?

I cant get PCI_E2 slot to work, and dont know why, im using the i7-5820k
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flobelix

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« Reply #68 on: 13-June-17, 17:48:58 »

PCI_E2 and E4 (PCI-E 2.0 x1 slots) don't share lanes with anything and are directly connected to the PCH. It is no lane switching problem For further support open an own topic please.

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MSI X299 Gaming 7 ACK (MS-7A90) Bios 1.5 
Core i7 7820X @ 4200.95 MHz (42 * 100.02 MHz, fixed all cores), 1.088v
Corsair H110 Liquid CPU Cooler
32GB (4 x 8GB) Corsair CMK32GX4M4C3000C15R @ 1500 MHz (DDR4-3000), 15-17-17-35-2t 1.35v
MSI Radeon RX Vega 64 WAVE 8G
256GB Samsung 830 SSD + 2TB Seagate Firecuda SSHD
Seasonic G-750 • +12V: 62A • +3.3V: 20A • +5V: 20A
Windows 10 Pro
Cooler Master Masterbox 5 MSI Gaming Edition
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