eGPU vs. normal GPU
Of course, the aspect of bandwidth must also be tested, because with Thunderbolt 3 you are limited by the data rate. Here, the total data rate is limited to 40 GBps, which is also not fully utilized. To illustrate the whole thing again, I benchmarked my NVIDIA GPU with the AMD card from the eGPU:
As a result, you can clearly see that the eGPU is at a disadvantage with its data rate. My NVIDIA RTX 3050 laptop GPU outperforms it in almost all categories. It has a 6x higher memory read rate than the eGPU. The fire width between GPU and CPU is calculated. The performance is measured in terms of how quickly the GPU can copy data from its own device memory to the system memory. The eGPU doesn’t really shine when it comes to memory write either. The NVIDIA card was able to achieve an almost 6x higher rate. Memory write performance measures how quickly the GPU can copy data from the system memory to its own device memory.
But the AMD card is not inferior everywhere. The NVIDIA card was able to beat it in memory copy. In this category, the performance of the GPU’s internal device memory is measured by recording the speed at which the GPU can copy data within its own memory. The AMD card also clearly outperforms in the other categories. The eGPU is only inferior to the normal GPU when it comes to bandwidth.
For the particularly curious, I also tested my Intel UHD. This also offers better performance in some categories than the eGPU and the normal GPU. Some tests could not be run because they are simply not supported by the Intel UHD.
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