I Have no Idea what SiS, but I can tell you thats the 5200 is AGP. So don't worry about it.
Now, You can easily tell whether you only have PCI slots or PCI and 1 AGP Slot.
Open case, look at slots and all the PCI ones should be white and in the same alignment. If one is AGP it will slightly offset from the other slots and it will not be white, it will be either lime Green or Brown most likely.