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Originally Posted by MeteorRain
That means the video renderer can't keep up because of the limited PCIe bandwidth? Very interesting.
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Also the number of lanes that the CPU has with the GPU is important. For instance, Xeon CPUs like the W-3265M has 64 PCI-E lanes, while its consumer counterpart probably has less lanes. The thing is that it's not only a matter of GPU, but also a matter of which CPU you are using. As a matter of fact, having a very good GPU with a not so good CPU will limit its efficiency.