Confused about what loop back loss means?
 
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0Badger0
(@0badger0)
Eminent Member
Joined: 3 months ago
 

I have a MacBook Pro 15” 2017 (Model A1707) Intel Core i7 3.1 GHz with a built-in dGPU Radoon 560. I have a Razer X Chroma with a Sapphire AMD Radeon Nitro+ RX 5700 XT card mounted in it and a Display Port connected Dell S-Series 27-Inch Screen LED-Lit Gaming Monitor (S2719DGF); QHD (2560 x 1440) up to 155 Hz.

Finally, I'm running Windows 10 under Bootcamp from a standalone external Samsung T7 SSD. When I plug in the T7 SSD, it boots straight into Windows 10 and I like that independent setup. If I unplug the T7 and restart, the MacBook boots right into OSX Catalina.

I've seen a lot of comments here that due to loop back, the monitor loses FPS performance if plugged into the MacBook Pro versus being plugged into the back of the Razer X Chroma with a Sapphire AMD Radeon Nitro+ RX 5700 XT card.

To be honest, on my system, the performance is better when the monitor is plugged directly into a TB3 Port via a Display Port connection.

Using Geekbench 5 GPU test ...

1. 76,000 with Dell S-Series 27-Inch Screen LED-Lit Gaming Monitor with Display Port connection plugged directly into a TB3 Port.

2. 75,100 with Dell S-Series 27-Inch Screen LED-Lit Gaming Monitor with Display Port connection plugged into the back of Razer Chroma.

Both tests using the Sapphire AMD Radeon Nitro+ RX 5700 XT card.

The question ... what am I not understanding?

Thanks for any and all feedback.

Regards,
Doug

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

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Mini i5
(@mini-i5)
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Joined: 1 year ago
 

@0badger0

Geekbench isn't drawing anything on your display.  It runs a series of computations offscreen.

Running a game, or running Firestrike, Timespy, or Unigine Superposition benchmarks will show a difference.

 

2018 Mac Mini i5 / 6-core 3.0-4.1 Ghz / 32GB / 256GB / Intel UHD 630 / PowerColor Gaming Station / PowerColor dual-fan RX 5700 XT / Mac OS 10.15.6 Catalina / Windows 2004 😏 / Dual LG 27" 4K displays


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0Badger0
(@0badger0)
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Joined: 3 months ago
 

@Mini i5

Thanks... that explains it... 🙂 

I downloaded and ran Unigine Heaven and with the same configuration, I get the following:

Plugged into MacBook Pro TB3

DirectX 9 ... FPS = 121.9 Score = 3072

DirectX 11 ... FPS 83.7 Score = 2110

OpenGL ...  FPS 29.1 Score = 732

 

Plugged into RazerX Chroma via HDMI

DirectX 9 ... FPS = 184.8 Score = 4655

DirectX 11 ... FPS 108.3 Score = 2728

OpenGL ...  FPS 131.6 Score = 3315

Clearly a performance hit by plugging into the computer, as opposed to plugging into the graphics card in the RazerX Chroma.

Appreciate your clarification for me.

Regards,

Doug

 

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

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0Badger0
(@0badger0)
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Joined: 3 months ago
 

@Mini i5

A second question?

Given I'm able to plug my Dell monitor into either an HDMI (v2.0) or a Display Port (v1.2) on the back of the 5700XT in the Razer Chrome with Dell supporting both interfaces, which type of connection would benefit the most?

Are there inherent advantages to either in regards to performance or compatibility with software?

Finally, s question that may not be in your wheelhouse, or in the right threads, but I have a Caldigit TB multiport (nice product) which provides 85W of power to my MacBook Pro.  For it to work, I need to plug it into the computer (TB3), but my RazerX Chromes also needs to plug (TB3) into the same computer, and it also provided 85W by default.

Is there any issue with doing this?  In other words, does the MacBook Pro TB3 bus decide which 85W to draw from and so it'san academic question?

Thanks again.....

 

 

 

 

 

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

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Mini i5
(@mini-i5)
Honorable Member
Joined: 1 year ago
 

@0badger0

There should be no practical difference between the two with your display. 

I’m not familiar with the caldigit dock, but others here might jump in with some insight.

 

2018 Mac Mini i5 / 6-core 3.0-4.1 Ghz / 32GB / 256GB / Intel UHD 630 / PowerColor Gaming Station / PowerColor dual-fan RX 5700 XT / Mac OS 10.15.6 Catalina / Windows 2004 😏 / Dual LG 27" 4K displays


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