I have searched and this is probably so simple I should know. My mobo GAZ87MXD3H has 4 PCIe slots: PCIEX16; EX1; EX8 & EX4. I have a 1394 PCIe card (PEX1394B3LP) and a WiFi PCIe card (TL-WDN4800) but don't know which slots are the best to use. I use onboard gfx. Will someone please advise?