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I'm trying to figure out whether my system supports PCI Express without opening up the box. lspci doesn't mention "Express" or "PCI-e" anywhere, but dmesg reports that a "PCI Express Hot Plug Controller Driver" is in use.

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Why are you avoiding opening the PC? Due to a warranty sticker? Could you lookup your PC from the manufacturer/supplier to see what is on the product specification? –  user155695 Feb 19 '10 at 14:23
    
This would be a fun solution to see +1. I wouldn't mind having this ability for when I am not in front of a machine. –  Urda Feb 19 '10 at 14:26
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3 Answers

up vote 6 down vote accepted

Easiest thing you can do is restart the machine and write down the model number then Google it and look up the specification.

Simple, but works!

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That's a good point, the BIOS POST screen will usually display a model number of some kind which as you say can be fed into Google. Nice idea. –  Mokubai Feb 19 '10 at 14:36
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If you want the motherboard make and model so you can google it, but you don't want to reboot, you should be able to get that info from /sys/class/dmi/id/board_vendor and /sys/class/dmi/id/board_name

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One thing to note is if your machine has a 1x, 2x, 4x, 8x, 16x PCI-E port and then buy the appropriate hardware.

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-1, Irrelevant. –  l0b0 Feb 19 '10 at 14:50
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