"Speed 133 MB/s (32-bit at 33 MHz – the standard configuration)
266 MB/s (32-bit at 66 MHz or 64-bit at 33 MHz)
533 MB/s (64-bit at 66 MHz)" From wikipedia on PCI slots.

I have an old HP desktop running Mint 19. I want for sure it is 64 bit and the speed of my PCI slot, is it 66 or 33 MHz from which I can tell?

did you try something like this: https://www.dell.com/support/article...bution?lang=en ?

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bren@bren-HP-Compaq-8100-Elite-SFF-PC:~$ lspci
00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev 02)
00:01.0 PCI bridge: Intel Corporation Core Processor PCI Express x16 Root Port (rev 02)
00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series Chipset HECI Controller (rev 06)
00:16.3 Serial controller: Intel Corporation 5 Series/3400 Series Chipset KT Controller (rev 06)
00:19.0 Ethernet controller: Intel Corporation 82578DM Gigabit Network Connection (rev 05)
00:1a.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)
00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 (rev 05)
00:1c.4 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 5 (rev 05)
00:1c.6 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 7 (rev 05)
00:1d.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev a5)
00:1f.0 ISA bridge: Intel Corporation Q57 Chipset LPC Interface Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 6 port SATA AHCI Controller (rev 05)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV710 [Radeon HD 4550]
24:00.0 Network controller: Qualcomm Atheros AR9287 Wireless Network Adapter (PCI-Express) (rev 01)
3f:00.0 Host bridge: Intel Corporation Core Processor QuickPath Architecture Generic Non-core Registers (rev 05)
3f:00.1 Host bridge: Intel Corporation Core Processor QuickPath Architecture System Address Decoder (rev 05)
3f:02.0 Host bridge: Intel Corporation Core Processor QPI Link 0 (rev 05)
3f:02.1 Host bridge: Intel Corporation 1st Generation Core i3/5/7 Processor QPI Physical 0 (rev 05)
3f:02.2 Host bridge: Intel Corporation 1st Generation Core i3/5/7 Processor Reserved (rev 05)
3f:02.3 Host bridge: Intel Corporation 1st Generation Core i3/5/7 Processor Reserved (rev 05)
bren@bren-HP-Compaq-8100-Elite-SFF-PC:~$

ok, so which device uses that PCI slot?

I have two empty PCI slots. And one PCI e 16 slot empty. I plan to install a USB 3.0 PCI card.

Novation,

Is your machine similar to this:
https://microdream.co.uk/hp-compaq-8...l#.XzJ_YRnTVE4

Here is a photo:

Attached Thumbnails

 

Similar.

THIS IS IT:
https://support.hp.com/us-en/product...c02030592#AbT1

I still think the speed depends both on the card and slot too, so without that there is no speed.

The card has standard USB 3.0 speed.
I got the picture in above.

In my OP I quoted a wikipedia fact about PCI speeds.

At the end of the day, it determines what kind of removable memory I buy, and it's read and write speed.

Astrotek USB 3.0 PCI Card 4 Port

why don't you insert the card and check the speed?

I will pick it up in two days and give it a try.