I have a board with a TPM header, but I can't find anywhere to buy a module to go in it. Are these standard thing or do I need one for the motherboard specifically? Is it even required for Bitlocker to work properly?
It's a Gigabyte GA-P67X-UD3-B3 motherboard.
You don't need TPM to use bitlocker.
How To Use BitLocker on Drives without TPM - How-To Geek
Would this reduce the security? Presumably the TPM is there for a reason.
Have a look at this list of FAQs: BitLocker Drive Encryption in Windows 7: Frequently Asked Questions
Good information to check out, specifically this area:
BitLocker Drive Encryption in Windows 7: Frequently Asked Questions
You're very welcome.
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