Sometimes you need to find what empty PCI or other slots are available on your PC without opening computer case. For example when you have only remote access to the PC, or simply don’t fancy crawling under a desk and disconnecting bunch or cables.

Problem is that not all system information utilities reliably display such information.
My favourite is HWiNFO, which is free and doesn’t require installation.

Versions 6.32 can be downloaded from here: HWiNFO

For latest versions check HWiNFO website.

Another alternative is SIW – System Information for Windows. It does the job, however, the portable version is only available as a 15-day trial. And a free home version requires installation which can install additional software if you are not careful.