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Will PCIe x1 cards work in PCIe x16 slots?

i am getting the asus p6t deluxe v2, and i have a pcie x1 tv tuner card and a pcie x1 sound card, the first pcie x16 slot is taken up by my dual slot graphics card, will the tuner and sound card work in the other pcie x16 slots?

I'm pretty sure it will, The pinouts look like the x16 slot just has more pins, while the first part is the same as the x1 slot.