Thunderbolt 3 is limited to 2750 MB/s of data transfer to the GPU. But actually, this speed doesn't matter much. The VRAM of a GPU is mostly used by the GPU and not the computer. Once the data's in the GPU, the GPU can process it as fast as usual.
PCIe 1.0 x1 is 250 MB/s.
PCIe 2.0 x1 is 500 MB/s.
PCIe 3.0 x1 is 985 MB/s.
PCIe 1.0 x4 is 1000 MB/s.
PCIe 2.0 x4 is 2000 MB/s.
PCIe 3.0 x4 is 3938 MB/s.
PCIe 1.0 x16 is 4000 MB/s.
PCIe 2.0 x16 is 8000 MB/s.
PCIe 3.0 x16 is 15754 MB/s.
Compare the frame rates of games using GPUs connected at different PCIe link widths and speeds:
PCI-Express 4.0 has been one of the main new features prominently brandished on the product boxes of both the 3rd generation Ryzen desktop processors and Radeon RX 5700 series graphics cards. We examine the performance impact of running these cards on older generations of PCIe.
www.techpowerup.com
It takes a lot of bandwidth to support the fastest graphics card, especially one that can play anything at 4K 60 Hz, with an eye on 120 Hz. The GeForce RTX 2080 Ti could be the most bandwidth-heavy non-storage PCIe device ever built. PCI-Express gen 3.0 is facing its design limits.
www.techpowerup.com
In this article, we investigate how performance of NVIDIA's GeForce GTX 1080 is affected when running on constrained PCI-Express bus widths such as x8 or x4. We also test all PCIe speed settings, 1.1, 2.0, and 3.0. One additional test checks on how much performance is lost when using the...
www.techpowerup.com
PCI-Express x16 3.0 is well established in the market, and the majority of gamers are using the interface. But what happens if you end up in a slot-bandwidth-constrained situation? We are testing NVIDIA's latest GeForce GTX 980 flagship in 17 games, at four resolutions, including 4K, to assess...
www.techpowerup.com
NVIDIA's latest beast offers unprecedented performance to the enthusiast gamer. But it also requires massive amounts of data being fed to it to perform. That's why it is commonly expected that high-end graphics cards are crippled if the PCI-Express interface does not offer the maximum speed of...
www.techpowerup.com
In this article, we investigate how performance of AMD's Radeon Fury X is affected when running on constrained PCI-Express bus widths such as x8 or x4. We also test all PCIe speed settings, 1.1, 2.0, and 3.0. One additional test checks how much performance is lost when using the chipset's PCIe...
www.techpowerup.com
Today's latest graphics cards come with support for PCI-Express 3.0, which promises twice the bandwidth, while still being compatible with older motherboards and graphics cards. In our article we analyze differences in PCIe performance on Intel's Ivy Bridge with GeForce GTX 680 and Radeon HD...
www.techpowerup.com
It shows that going from PCIe 3.0 x16 down to PCIe 2.0 x4 (down to 13%) only lowers the performance slightly (down to 80%). Higher resolutions have a lower drop in performance because higher resolutions use the same amount of data but do more work in the GPU.
Thunderbolt 3 has extra latency so even though it can transmit 2750 MB/s of data, it may perform less than PCIe 3.0 x1 (985 MB/s). Here again higher resolutions will have a lower drop in performance.
Page 17 | I was thinking about this, and I think I came up with a way to test the effect of Thunderbolt 2 and/or Thunderbolt 3 on GPU performance. I h...
egpu.io
