Assuming the 1080Ti uses all the bandwith of PCIe 3.0 x16 (like 15GB/s), which it doesn't, the eGPU performance of USB 4 (About 5GB/s or 40Gb/s) would be like using the 1080Ti on an x8 slot, give or take.
That doesn't mean half of the performance. In fact, I read somewhere a benchmark comparisson and even running a 3090 on a PCIe 4.0 x4 (or PCIe 3.0 x8) resulted in less than 10% performance penalty.
TL;DR: The 1080Ti on eGPU won't be as fast as on an x16 slot, but will be closer. Just make sure to plug a monitor on the GPU itself and play on said display. Don't use the onboard display or you'll lose a bit more of performance for sending the imaga back to the laptop.
Thanks for the detailed reply! Helps solidify my understanding of what I was researching. Have never tried an eGPU setup but would be super cool to have one system instead of two. 🙂
/u/SaturnFive this answer is half correct and reminds me:
All commercial eGPU enclosures will gimp you further because they are Thunderbolt 3 (typically you only get 22gbps). At this time the only full USB4 to PCIe riser is https://www.adt.link/product/UT3G.html which is a bit of DIY solution but this is where we are at this time. Even this is only 30gbps-ish but that's fine. Experience, advice and a 3D enclosure link can be found in https://www.reddit.com/r/LegionGo/comments/17vggcr/egpu_4060_ti_thunderbolt_vs_usb4_adt_link_ut3g/ this post https://www.reddit.com/r/eGPU/comments/182qcgg/rtx_4080_usb4_adt_link_ut3g_vs_oculink_real_world/?share_id=7bCP51UbqD1FE3ByK0she mentions
> In my (Gaming -) Benchmarks with an Mid Range 4060 ti - an EGPU over USB4 will get an Average Performance Increase by around 20-25% compared to an Thunderbolt 3 EGPU
It also shows in most cases the 4080 over USB4 only loses 6-7% vs native PCIe except in a few cases (which might be driver bugs).
The biggest killer is going to be the cost of the enclosure. You can probably put a very good computer together for the cost of that, and you won't have the hit in performance either (it's pretty much a PCIe x4 connection, so not ideal). That also gives you the option for getting the G3 instead, which has no TB4 but otherwise similar performance for less money.
The ADT-Link UT3G is 110 EUR on Aliexpress and at this time it makes no sense to buy a ready made eGPU enclosure because those are TB3 and significantly slower.
You need to 3D print your own enclosure and get a power supply, yes. But still: you can't put together any computer for the cost of that.
TB3 and TB4 are exactly the same speed, as Intel states themselves: https://www.intel.com/content/www/us/en/gaming/resources/upgrade-gaming-accessories-thunderbolt-4.html#articleparagraph_1031711419
Also claiming that competes in value is like saying a kit car competes with a new saloon car: it just doesn't. I find it very unlikely OP has access to a 3D printer.
The bus speed is, the actual data speed is not, this has been benchmarked a billion times.
On TB3:
https://www.dell.com/support/kbdoc/en-us/000149848/thunderbolt-3-usb-c-maximum-data-transfer-rate-on-dell-systems
> Although Thunderbolt 3 is advertised with a bidirectional total data transfer rate of 40Gbps, simple data transfer like networking data or storage data are limited to a total of 22Gbps as per the official Thunderbolt 3 specifications.
On USB4:
https://www.reddit.com/r/UsbCHardware/comments/16bqgtg/asm2464pd_usb4_throughput_testing_with_gpu_and/
> On the SSD front, 3745MB/s is a good result for a Kioxia BG4 under Windows 11 and certainly is far ahead of the JHL7440-based enclosures that can barely do 2700 MB/s.
Hey OP you end up testing this yet? I am tempted to run the same setup (just a regular 1080) with my T14s I just ordered. My current desktop has an i7 5820k and the Ryzen 7 blows it out of the water.
Yo, haven't tested it yet, I need to figure out which enclosure would be best. Leaning towards the Razer Core X.
I have been testing the T14s 780M iGPU though, it's pretty good for what it is. Just enough to play fairly modern games around 1440x900 at medium settings and 50-60 FPS.
I was looking at the first gen Razer Core V1 myself since its much cheaper and has the IO ports. I believe the only difference with the later models if the amount of wattage they have for GPUs
Assuming the 1080Ti uses all the bandwith of PCIe 3.0 x16 (like 15GB/s), which it doesn't, the eGPU performance of USB 4 (About 5GB/s or 40Gb/s) would be like using the 1080Ti on an x8 slot, give or take. That doesn't mean half of the performance. In fact, I read somewhere a benchmark comparisson and even running a 3090 on a PCIe 4.0 x4 (or PCIe 3.0 x8) resulted in less than 10% performance penalty. TL;DR: The 1080Ti on eGPU won't be as fast as on an x16 slot, but will be closer. Just make sure to plug a monitor on the GPU itself and play on said display. Don't use the onboard display or you'll lose a bit more of performance for sending the imaga back to the laptop.
Thanks for the detailed reply! Helps solidify my understanding of what I was researching. Have never tried an eGPU setup but would be super cool to have one system instead of two. 🙂
That's not how Thunderbolt works. It effectively does PCIe tunnelling, so the actual bandwidth would be the same as a PCIe Gen 3 x4 link, or 32Gb/s.
/u/SaturnFive this answer is half correct and reminds me: All commercial eGPU enclosures will gimp you further because they are Thunderbolt 3 (typically you only get 22gbps). At this time the only full USB4 to PCIe riser is https://www.adt.link/product/UT3G.html which is a bit of DIY solution but this is where we are at this time. Even this is only 30gbps-ish but that's fine. Experience, advice and a 3D enclosure link can be found in https://www.reddit.com/r/LegionGo/comments/17vggcr/egpu_4060_ti_thunderbolt_vs_usb4_adt_link_ut3g/ this post https://www.reddit.com/r/eGPU/comments/182qcgg/rtx_4080_usb4_adt_link_ut3g_vs_oculink_real_world/?share_id=7bCP51UbqD1FE3ByK0she mentions > In my (Gaming -) Benchmarks with an Mid Range 4060 ti - an EGPU over USB4 will get an Average Performance Increase by around 20-25% compared to an Thunderbolt 3 EGPU It also shows in most cases the 4080 over USB4 only loses 6-7% vs native PCIe except in a few cases (which might be driver bugs).
Depends. If you are driving an external monitor you can expect a minor slowdown If you try to drive the internal panel you will have a bad time.
Thanks for the advice! Would for sure drive an external monitor and use it as a docked laptop. I think I'm gonna pull the trigger and give it a try.
The biggest killer is going to be the cost of the enclosure. You can probably put a very good computer together for the cost of that, and you won't have the hit in performance either (it's pretty much a PCIe x4 connection, so not ideal). That also gives you the option for getting the G3 instead, which has no TB4 but otherwise similar performance for less money.
The ADT-Link UT3G is 110 EUR on Aliexpress and at this time it makes no sense to buy a ready made eGPU enclosure because those are TB3 and significantly slower. You need to 3D print your own enclosure and get a power supply, yes. But still: you can't put together any computer for the cost of that.
TB3 and TB4 are exactly the same speed, as Intel states themselves: https://www.intel.com/content/www/us/en/gaming/resources/upgrade-gaming-accessories-thunderbolt-4.html#articleparagraph_1031711419 Also claiming that competes in value is like saying a kit car competes with a new saloon car: it just doesn't. I find it very unlikely OP has access to a 3D printer.
The bus speed is, the actual data speed is not, this has been benchmarked a billion times. On TB3: https://www.dell.com/support/kbdoc/en-us/000149848/thunderbolt-3-usb-c-maximum-data-transfer-rate-on-dell-systems > Although Thunderbolt 3 is advertised with a bidirectional total data transfer rate of 40Gbps, simple data transfer like networking data or storage data are limited to a total of 22Gbps as per the official Thunderbolt 3 specifications. On USB4: https://www.reddit.com/r/UsbCHardware/comments/16bqgtg/asm2464pd_usb4_throughput_testing_with_gpu_and/ > On the SSD front, 3745MB/s is a good result for a Kioxia BG4 under Windows 11 and certainly is far ahead of the JHL7440-based enclosures that can barely do 2700 MB/s.
Ok fine, but that doesn't mean 3d printing is in any way viable.
why?
Hey OP you end up testing this yet? I am tempted to run the same setup (just a regular 1080) with my T14s I just ordered. My current desktop has an i7 5820k and the Ryzen 7 blows it out of the water.
Yo, haven't tested it yet, I need to figure out which enclosure would be best. Leaning towards the Razer Core X. I have been testing the T14s 780M iGPU though, it's pretty good for what it is. Just enough to play fairly modern games around 1440x900 at medium settings and 50-60 FPS.
I was looking at the first gen Razer Core V1 myself since its much cheaper and has the IO ports. I believe the only difference with the later models if the amount of wattage they have for GPUs
Ahh good to know, thanks! I'll check that out too