The picture is very different in games, some games completely collapse on the Thunderbolt interface, others run excellently or flawlessly up to a certain frame rate. Open world titles naturally cause the most bandwidth problems, as a lot is streamed from the main memory and the CPU load is high.
Anno 1800:
Anno runs surprisingly well on the eGPU, both in FHD and UHD. Unfortunately my data for the 5700XT was not correct, so it is missing here in the benchmarks. In UHD the 6700XT just wouldn’t boot with the internal panel, I don’t know the cause.
The reductions are with a little over 10% on average more than bearable, the game runs even in UHD still top, even on the internal panel, although the engine of Anno also solves this cleverly and some textures sometimes load in quite late.
Shadow of the Tomb Raider
SotTR makes high demands on the CPU, here in FHD bandwidth limit and CPU limit alternate depending on the scene. Striking here, the 5700XT and the 6700XT are almost identically fast (or rather slow…). The RTX 3060 and RTX 3070 are also pretty close, with the Geforce cards running much better in general. You can see the limitations of the bandwidth in FHD very well in this example. In UHD, the cards are more differentiated from each other and the RX 6700XT and the RTX 3070 are about on par. Interesting again is the 3060, which is in the sweet spot and loses the least performance percentage-wise when used on the internal panel. The RX 5700XT once again doesn’t cut a good figure when using the internal panel, the Vega does a good job.
Watch Dogs Legion:
WDL is the absolute worst case for an eGPU, the game already jerks in the menu. The framerates are very low, the frametimes a disaster. The Radeons both run into the same limit in about, we see as very clear a bandwidth limit here. The 3060 and the 3070 are also very close. The CPU is challenged in the game, but is not the limiting factor. The differences between external and internal panels are comparatively small. I’ve overclocked the 3060 to the max here as an example, in 720p + DLSS performance to illustrate the bandwidth limit.
The Vega M GL barely lags behind the Radeons here, since it is not affected by the bandwidth limitation, but the 4GB HBM is not enough in Watch Dogs in the preset and the chip drops significantly in the last third.
In UHD, the 3060 is as fast as the 6700XT, which should easily be 30% faster.
Cyberpunk
Here I have deliberately measured only with the internal panel. The performance gaps fit between the cards here so far, but an RTX 3070 should be able to easily handle the 60 FPS here in a desktop system, all cards fall short of expectations, but can also be optimized accordingly to reach the 60Fps. The frame times are stable, DLSS scales much better than in Watch Dogs to my surprise. On an external panel there is about 20% more performance with all three cards. The CPU also has to do well in the game, here it is hard to separate if the CPU or the bandwidth is limiting. Probably a mixture of both.
Dirt 5
I have not tested the 5700XT here due to time constraints. The CPU does not play a role in the game. The RX 6700XT has the edge here for the first time with the use of the internal panel. The two Geforce drop more, but are superior when using the external panel. The RTX 3060 then comes close to the 6700XT, both cards are only separated by 10%, the RTX 3070 can even stand out quite clearly in this case. The APU directly receives a message because of too little VRAM, end of the line memory.
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