This results in BSOD on multiprocessor system. Solution is to download the MS hotfix (they will send you a password protected zip file to install the hotfix from).More details here.
When your PC crashes you may also see a message to disable ROM caching or shadowing. ROM is much slower to access than RAM (120ns compared with 50ns, say), so a performance "trick" is to shadow the ROM in the RAM (i.e. mirror the code). There is usually a separate parameter to control the shadowing of the system BIOS, video BIOS and adapter ROM areas.
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