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how do i tell whether my computer has pci or pci express
my motherboard is a ASUS P4B533-VM

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— quick, practical ways to be certain whether your board uses PCI, PCI Express, or something older.

As hinted, a visual check is the fastest: PCIe comes in different lengths (x1, x4, x8, x16) and the x16 slot used by modern GPUs is long but keyed differently from legacy slots. AGP (an older graphics slot) and conventional PCI are different shapes and positions on the board. Look for small printed labels on the PCB near each slot (labels like PCI, PCIEX16, AGP are common).

If you prefer not to open the case, check the motherboard manual or the ASUS support page for P4B533-VM to see the exact expansion-slot layout. In the BIOS there is often a setting for primary display or video initialization that will list available options (Onboard/AGP/PCI), which also confirms what slot types are present.

From software, on Linux use lspci to detect bus capabilities; for example:

lspci -vv | egrep -i "vga|agp|express"

That will show whether a VGA controller is on an AGP or Express bus. Windows tools do not reliably show physical slot types, so the manual or visual check is usually necessary there.

A few cautions and upgrade notes: physical incompatibility is real — PCIe cards do not fit AGP or conventional PCI slots, and AGP-to-PCIe GPU adapters are not practical. Also check power connectors and BIOS support before buying a new card. If the board only has legacy slots and a modern PCIe GPU is needed, the realistic path is a newer motherboard/CPU platform rather than forcing incompatible hardware.

Quick checklist: 1) Inspect the board for slot labels; 2) Consult the manual/support page; 3) Use BIOS options to see available video buses; 4) Run lspci on Linux for a software check.

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Member Avatar for TheNNS

PCI
PCI express

PCI is bigger, express is smaller

Member Avatar for zelkea

Thurstboss,
I just looked up your motherboard, it is capable of supporting a AGP video card.

AJZ

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