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what is the difference between agp and pci graphics slots?

my pc is a presario sr1709uk with an amethyst-m 1.0 motherboard.
it has radeon xpress200 Integrated graphics which are crap.
i want to add a graphics card for a bit of gaming.when i checked on the hp site for my mother board i found a diagram which shows the graphics slot to be a pci type(brown slot with a partition about 25mm along the slot). when i tried to fit a graphics card of this type from another faulty pc i found that my mother board has a different type of brown slot. this one is continuous with no partition. is this the agp type? why is mine different to what hp say it should be? which is better? whats the difference? any help? thanks

Your motherboard has 3 PCI slots and a single PCI Express x16 slot (for graphics).
Don’t get hung up on the colours! In my experience PCI and the much smaller PCI Express x1 slots are usually white, and the PCI Express x16 slot(s) can be all sorts of garish colours. Or brown ish – as in this case.

AGP (usually brown) has mostly been superseded by PCI Express x16, and came in a variety of flavours 1x, 2x, 4x, 8x which used different (sometimes incompatible) signal voltages, so that the slots were introduced to prevent damage upon insertion of incompatible cards.

Get a torch on the job, and see that “partition” – it’s brown on brown – just believe and you’ll see it!