To paraphrase @marcan42, iirc: "you could run pcie over different lengths of wet string"
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I don't think I went as far as *different* lengths of wet string... but yeah :-)
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Conductivity aside, that would create Hopper-like delays in the signal lines, yes?
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Pcie spec involves relatively robust link training so that it's safely independent of the physical medium. As a result, it's capable of running over just about anything that's conductive.
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It doesn't include FEC so you have to have a reasonably low BER. I don't think it would work over literal wet string, for example.
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Yeah, I was exaggerating. But it does work over rather unorthodox wiring, like that USB3 cable thing, or soldering down some fly-wires, or ribbon cables (at least at short distances).
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It trains the 4x link at 8 GT/s over floppy cable here, but then it observes errors and I think drops it a bit. Maybe if the extender used UDMA cable instead of floppy cable it'd actually work well.
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Replying to @whitequark @marcan42 and
But yeah "I can't get 50 fps over floppy cable, it caps out at something like 20 fps" is a very good complaint to have about your 8 GB/s combined throughput serial interface.
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Is it even that bad? I was under the impression that PCIe is ~rarely the bottleneck in modern gaming.
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It is if you're transferring back framebuffers at 3K, yes.
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Oh, eGPU buffer sharing? Yeah okay.
2:56 AM - 19 Feb 2019
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