FYI, the windows installer added an entry to the EFI boot loader (as Boot0000), but left Gentoo as the active entry;
# efibootmgr BootCurrent: 0003 Timeout: 15 seconds BootOrder: 0003,0000,0008,0007,0001,0002 Boot0000* Windows Boot Manager Boot0001* Hard Drive Boot0002* Network Card Boot0003* 980GrubEFI Boot0007* USB HDD Boot0008* UEFI: Patriot Memory PMAP, Partition 1
