pci express

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What's the Deal with PCI Express?

Ask the Doctor LogoAre x1 PCI Express cards and x16 PCI Express slots compatible? Can I insert my x1 PCI Express soundcard into a x16 PCI Express slot? And maybe this question isn’t relevant, but why do motherboard companies always put their x1 slots between two x16 slots? Even if you install one videocard it will block access to the x1 slot. Of course, you can install your videocard in a secondary x16 PCI Express slot, but how do you know it’s not running at x8 speed? Moreover, if you want to install only one videocard, the motherboard manufacturer instructs you to install it in the topmost x16 slot. But is that required?

—Vitaliy

Read the Doctor's answer after the jump.