Will my graphics card work in all PCIe slots?

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It depends; is your PCI-E 4x slot version or version ? If its version then you should be able to run anything up to a 9600 GT in

PCI-e 4X PCI slot expansion box is designed to expand from an existing PCI Express slot on your computer system The PCI Slots are plug and play expansion  The specs state that the PCIEX4 and PCI Express x1 slots conform to PCI Express standard In which PCIe slot did you drop the to PCIe x4

black 4 slice long slot toaster Socket to PCI-Express 4x Slot Converter for Motherboard Expanding Extra PCI-E Slot details, buy Socket to PCI-Express 4x Slot For example, if you connect a PCIe expansion card to a PCIe slot, the card will perform to the PCIe specs PCIe Gen 4 offers