Need some advice about selection of FPGA devices(probably with PCIe interface)

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I just need a lot bit more information about the FPGA boards attached to a laptop before I purchase the devices.

So if the FPGA devices have a PCIe interface(e.g., this one: http://www.annapmicro.com/ws6pci.html ), is it possible to directly insert it to the PCIe interface inside the laptop(is the FPGA device too big?).

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You will not be able to plug any sort of PCIe card inside a laptop :)

The link you point to shows a board that looks significantly longer than a regular PCIe card. You would need to talk to MaxExpansion and OneStopSystems to get their recommendations on which product to use. For example, I use this bare motherboard, which would also work for the card you link to

http://www.onestopsystems.com/pcie_atx_bp.php

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What if my laptop doesn't have PCIe connector on the side? Is the "ExpressCard" slot common in today's laptop? I still believe directly inserting it inside will get higher throughput,right?

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An ExpressCard is only a x1 PCIe link, so depending on your data transfer requirements, it may be too slow.

You would need to insert the board inside a regular desktop machine if you need x4 or x8 PCIe. If the board is too large for a regular desktop, then you can still use the OneStopSystems board I linked to above, but you also need a bridge card and a cable - to bridge x4 or x8 PCIe from the motherboard over to the bare motherboard.

Cheers,

Dave