2015 15" Clevo P750DM-G GTX980M + RX Vega 56@32Gbps-M2 (ADT R43SL) + Win10 [Robert Evans]^ // also tested PCE164P-N03 x1 M.2 adapter  

 

Robert Evans
(@robert_evans)
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November 10, 2017 9:32 pm  

 

Before I begin I want to thank the egpu.io community as a whole for their implementation guides and reference tables. Without them I would have never made the jump from using my laptop's dGPU to my shiny new Vega 56 desktop GPU.

 I've opted to get an M.2 eGPU setup as I dislike the idea of spending $300 for a TB3 enclosure that effectively gives less than x4 performance. For this guide I will be showcasing two M.2 egpu docks. As I didn't want to shell $100 on a non-returnable EXP GDC Beast only to find out it isn't compatible with my laptop.

Instead, I opted instead to buy the $7 CHIPAL M.2 to x16 adapter (PCE164P-N03, runs at PCIe 3.0 x1) to test that an M.2 eGPU would work with my laptop and when I confirmed it functioned correctly I paid $38 ( $25 and then $12 for international shipping) for a 20cm ADT R43SL.

Warning: for any of you considering a CHIPAL M.2 to x16 adapter, you should know that leaving the eGPU adapter connected to a running PSU while your laptop is off seems to be an easy way to heat and maybe burn your graphics card. Just the other day I left my Vega 56 connected to the  CHIPAL M.2 to x16 adapter with a running PSU and my laptop off, and after 30 minutes to an hour the card was hot enough to burn my hand but of course since the laptop was off, the GPU fan never started spinning. This problem doesn't occur with the ADT R43SL as the R43SL doesn't actually power the graphics card unless the connected laptop is on.

 

Hardware

 

Setup

There are two M.2 SSD ports on the P750DM-G, one next to the GPU fan seen here and one in the HDD bay as pictured here. In my experience the one in the HDD bay runs at the speed it's supposed to and the one next to the GPU fan seems to have problems ( will clarify later).

I don't know why this is the case, and I also don't have a fix for it and so I'll recommend you use the one in the HDD bay. Otherwise all you have to do to get the ADT R43SL or CHIPAL M.2 to x16 adapter to work is to plug it in, power it on, connect and power your GPU and start your laptop.

The only issue I ever ran into was that my laptop would sometimes not detect the eGPU, and all I had to do to get it to detect was restart it once ( 95% of the time) or restart it twice ( 5% of the time). After that you simply install the appropriate drivers and hookup an external monitor and you've got a working eGPU.

 

Benchmarks

SteamVR

GTX 980m ; Vega 56 @ x1 ; Vega 56 @ x4

 

Unigine Heaven @ 1920x1080 settings

GTX 980m ; Vega 56 @ x1 ; Vega 56 @ x4

 

Total War: Warhammer II @ 1920x1080 using the in-game battle benchmark settings

GTX 980m ; Vega 56 @ x1 ; Vega 56 @ x4

 

Unigine Heaven @ 3440x1440 settings

GTX 980m ; Vega 56 @ x1 ; Vega 56 @ x4

 

Total War: Warhammer II @ 3440x1440 using the in-game battle benchmark

Settings are exactly the same as the 1920x1080 settings, but the resolution has been increased.

GTX 980m ; Vega 56 @ x1 ; Vega 56 @ x4

Edited: 4 months  ago

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nando4
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November 11, 2017 12:39 am  

@Robert, thank you for implementation submission. The desktop RX Vega 56 video card @ x4 3.0 a great companion for your desktop CPU.  The Total War Hammer @ FHD 84 vs 43 FPS result for x4 3.0 and x1 3.0 highlights the performance difference between bandwidths.

A couple of points:

- any pics of the system + eGPU that can be shown in the intro to bring it all to life?

- what length cable did you get for the ADT R43SL adapter? I'm seeing 20cm for US$25

- can you re-check the Vega 56 GPU-Z bus interface? Your screenshot is showing x16 3.0 when we'd expect to see x4 3.0.

- can you confirm the Chipal x1 adapter ran at x1 3.0? Something I've been curious about. This is best answered with a hwinfo64 & AIDA64 GPUGPU bandwidth screenshot. Your 6th gen chipset has a 8Gbps x1 3.0 wifi M.2 slot. Just wondering if the BIOS allows that full speed & whether the Chipal adapter, with it's USB 3.0 cable (5Gbps) transmission cable, can maintain a reliable 8Gbps?

- equally then, did you test your x4 M.2 adapter in the slot next to the CPU? The BIOS may upspec the link from the shown 2.5Gbps to 8Gbps.

Edited: 7 months  ago

eGPU Port Bandwidth Reference TableeGPU Setup 1.35


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Robert Evans
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Posts: 10
November 11, 2017 6:52 am  

@nando4

I just wanted to correct myself first, earlier I mentioned there was a m.2 slot next to the CPU fan - I meant to say it's next to the GPU fan. As for the ADT-R43SL, I got the 20cm cable length option. The GPU-Z bus interface shows x16 3.0, even on the Chipal x1 adapter. You'll notice in the linked screenshots later in this post that aida64 reports the same.

As for testing the bandwidth of the GPU fan m.2 slot and the bandwidth of the Chipal x1 dock.

GPU Fan M.2 slot with ADT-R43SL ; GPU Fan M.2 slot with Chipal x1 dock ; HDD Bay M.2 slot with Chipal x1 dock

Edited: 7 months  ago

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nando4
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November 11, 2017 7:23 am  

@Robert, for the ADT-R43SL, I am not seeing any performance differences between the M.2 slots.

GPU Fan M.2 slot with ADT-R43SL (3138MB/s) ;  HDD slot M.2 slot with ADT-R43SL (3148MB/s)

As for the Chipal x1 dock, there is a difference:

GPU Fan M.2 slot with Chipal x1 dock (533.1MB/s)  ; HDD Bay M.2 slot with Chipal x1 dock (784.6MB/s)

The HDD Bay is giving us 8Gbps-M2 bandwidth. Impressive as I wasn't expecting the USB 3.0 interconnect cable to deal with the higher 8Gbps operating frequency.

The slower speed on the GPU Fan M.2 looks to be due to bit errors & error correction being engaged. Being close to the dGPU, there is more EMI noise there which the Chipal's USB 3.0 cable may not be insulating against well. If you have a ferrite bead, then try adding it to the USB 3.0 cable to see if it helps like shown. If not, try wrapping the USB 3.0 cable up in aluminium foil. Re-test to see if H2D numbers boost up.

Internal Vega56 PCIe switch is giving us confusing link speed data

As for the link speed, the Vega has a PCIe switch so the final PCIe bridge sees the video card attach at x16 3.0. Not sure why there is a PCIe switch in the video card. 

To get accurate details of the link with the notebook,  go up a few levels in the hwinfo64 tree and look at the AMD Vega10 - Switch Upstream in PCIe link details. It's the one that connects with the notebook PCIe port. I'd expect it to report x4 3.0 (ADT) and x1 3.0 (Chipal).

 

 

Edited: 7 months  ago

eGPU Port Bandwidth Reference TableeGPU Setup 1.35


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Robert Evans
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November 11, 2017 6:11 pm  

@nando4

Starting with the Switch upstream - HDD Bay M.2 slot w/ ADT R43SL switch upstream. I also wrapped the Chipal's USB 3.0 cable with Aluminium foil as seen here and connected it to the GPU Fan M.2 slot and ended up with this result.

I wanted to add that even with the Aluminium foil. Running a Chipal x1 adapter through the GPU Fan M.2 slot is highly unstable. Whether the memory write bandwidth is 200 mb/s ( I tested this when I first received the chipal x1 dock a month ago) or 715 mb/s after being wrapped in Aluminium foil. I cannot get the dock to work for more than 10 minutes as the desktop becomes very stuttery and will generally crash within 10 minutes of starting windows.

I ran aida64 a second time and got a memory read bandwidth of 764 mb/s but was unable to obtain the memory write speed as the laptop crashed before completing the aida64 GPGPU benchmark.

The stutter/instability does not occur whatsoever when using the ADT R43SL or Chipal x1 dock with the HDD Bay M.2 slot. I also recall suffering one crash using the ADT R43SL with the GPU Fan M.2 slot yesterday when I tested the bandwidth, though I don't know if this was simply a coincidence.

Edited: 6 months  ago

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nando4
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November 13, 2017 1:34 am  

@Robert, so we see then the EMI noise near the GPU Fan M.2 slot is the cause of the Chipal x1 dock instability. The ADT R43AL differs to the Chipal by running it's wires in a parallel fashion, so with differential encoding are better suited for transmission near noisy sources, as your tests prove. Still, for a US$7 adapter, the Chipal seemingly can do 8Gbps transmission in your HDD Bay M.2 slot with a less EMI noisy environment.

eGPU Port Bandwidth Reference TableeGPU Setup 1.35


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(@mehmet_oz)
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February 4, 2018 11:34 pm  

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Robert Evans
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February 8, 2018 6:45 am  

@Mehmet

What eGPU adapter and what model graphics card are you using?, I can still use my Vega 56 with my laptop's internal monitor.


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(@mehmet_oz)
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February 9, 2018 5:46 pm  

adt r43sc-wk 
https://m.tr.aliexpress.com/item/32828953261.html
8Gbps but I tried with msi gtx 1060

  • For my search i need optimus and disable dgpu in bios for accelerated internal screen but our device dont have optimus.
  • I could use internal screen but when I try game or benchmark 980m working,when I disable 980m in computer management
  • It works like intelish graphics performance I m sure its not 1060.
  • Thanks for respond.

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