A casual glance shows that Legacy options are available and useable there.
But when it is working perfectly, no real need is there to pay much attention in it. If you opt for windows 10 (or windows 8.1) anytime in future, then changing to UEFI will have some bearing.
Samsung 128GB 840 Pro SSD (1),
Samsung 4TB 850 EVO SSDs (4)
Samsung 4TB 850 EVO SSDs (16) external backup drives used in 2.5" hot swap bays in the computer.
PSU
Corsair HX750w
Case
Antec Two Hundred v2 (modified)
Cooling
Cooler Master GeminII S524 120mm (fan replaced with a 140mm)
As the legacy option for USB is there, the legacy boot option for ODD should also be there. And as default the configuration for USB is, "if Legacy is available then legacy first and then UEFI"; ODD also should be configured in the same way. As far as I know and have seen, all the boards have it, at least till date.
That is how your windows is installed, the installer booted using the "legacy first" option. If you dont guide a windows 7 installer to boot as UEFI, it will generally boot as legacy due to it. It is not an issue, not a bad install, not anything. It just does not use the UEFI features. And those are not any very big deal for windows7. Windows 7 is perfectly OK with BIOS+MBR.
The catchline is, your board has the UEFI features, but the present windows installation does not use it. Because during installation it was not guided to boot as UEFI, so it booted as legacy, formatted the SSD to MBR and kept UEFI aside.
