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Graphics cards only have to comply to EMI standards while mounted inside a computer chassis. Ultimately the person/company putting a computer together (or impo
by blattimwind 8y ago
Graphics cards only have to comply to EMI standards while mounted inside a computer chassis.
Ultimately the person/company putting a computer together (or importing it) is responsible for the whole computer adhering to EMI standards.
- exikyut 8y agoHeh, I just pictured a GPU inside an empty PC case, and then immediately realized of course that wouldn't work, and am now wondering, how do you generate the necessary load to correctly EMI-test a GPU? Do GPUs include a secret "crank everything to 11" test mode feature that exercises all the cores and RAM and everything, so you can just bolt it into a case, maybe connect it to a fake motherboard that supplies 3.3V or whatever so the card initializes properly... or do vendors test with a massive pile of motherboards, measuring and offsetting for the EMI generated by each motherboard?
- SAI_Peregrinus 8y agoIf the GPU + Motherboard passes EMI compliance, then the GPU - Motherboard must also pass, since the motherboard doesn't provide shielding but only adds noise. So I don't think the particular motherboard should matter. The measured interference will always be >= to the real interference produced by the GPU under test.
- exikyut 8y agoHmm, good point, didn't quite look at it that way. But now I'm wondering if there are motherboards out there that radiate a little bit more than they should, and force peripheral vendors to do extra work clipping EMI in their own products. This is probably not true, since all PCI card vendors would have to test their products with tons of different boards.