eGPU Performance Loss - PCI Express vs. Thunderbolt
 
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eGPU Performance Loss - PCI Express vs. Thunderbolt  

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ataylor
(@ataylor)
Eminent Member
Joined: 2 years ago
 

I as more wondering how NOT having the monitors connected to the egpu's but directly internal via tb3 adaptor will effect things. i.e will i not get full speed out of the gtx cards when no monitor is connected to them? I assume it won't make a difference for "compute" tasks.

This post was modified 1 year ago

2018 MacBookPro 15 in. /w Touchbar - i9 - 32gig ram - 1080 Aorus 1080 Gaming Box - Sonnet-Breakaway550 with GTX 1080 - Still need to get both of the GTX 980TI working for 4 GTX total cards


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Martin Poon
(@martin_poon)
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Joined: 8 months ago
 

planned to get the Razer core x with RTX 2080ti, but hesitated after reading an article which said there is much 31% performance drop than those desktop setups

is it a hardware problem or software or alleviated any in recently?

IMG 8808

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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Rydell Hall
(@rydell_hall)
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Joined: 6 months ago
 

Am I understanding this right, if you have a Thunderbolt 3 laptop (we'll say the latest Razer 15" so everything is up to spec) with an eGPU connected to an external 4k monitor, you will only see a ~5% reduction in performance vs a similarly spec'd desktop? I started considering getting a laptop+eGPU to replace my desktop but saw specs that you lose up to 30% of the GPUs performance.  So now I'm reading this saying that's only the case for resolutions lower than 4k. I have a 4k external monitor that I would be using at home for gaming, then when I'm gaming away from home I'd just use my laptop by itself. This seems like the perfect solution if that's the case. I don't care about a 5% performance loss, but a 30% is not worth it.

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)
Reputable Member
Joined: 11 months ago
 

@rydell_hall

Until you personally test a specific game on a specific laptop+eGPU - and are able to adjust the relevant power and performance settings - go ahead and assume a 30% performance loss. 👨‍💻

Sometimes the loss will be greater, depending on the game, and the laptop’s thermal management (aka thermal throttling).

This thread is a good resource. It explains the various factors involved. There are many.

2018 Mac Mini i5 / 6-core 3.0-4.1 Ghz / 32GB / 256GB / Intel UHD 630 / PowerColor Gaming Station / PowerColor dual-fan RX5700 XT / Mac OS 10.15.5 Catalina / Windows 2004 😏 / LG 27" 4K display


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Rydell Hall
(@rydell_hall)
New Member
Joined: 6 months ago
 
Posted by: @mini-i5

@rydell_hall

Until you personally test a specific game on a specific laptop+eGPU - and are able to adjust the relevant power and performance settings - go ahead and assume a 30% performance loss. 👨‍💻

Sometimes the loss will be greater, depending on the game, and the laptop’s thermal management (aka thermal throttling).

This thread is a good resource. It explains the various factors involved. There are many.

Appreciate the info. I read through the thread once again and it is seeming dicey. I'm about to pick up this laptop:

https://www.amazon.com/dp/B07HPQPNV1/ref=cm_sw_r_cp_api_i_pr4kEbYXJP4J6

With this card:

https://www.amazon.com/dp/B07HY6QWXN/ref=cm_sw_r_cp_api_i_It4kEb15JFN81

The goal is RDR2 on ultra (4k reso) with my existing 4k monitor w/ <10% performance loss

Seems what I'll have to do is start asking around if anyone has tried it with this specific setup. 

This post was modified 6 months ago

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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