I found X99 motherboard Manual.
Gigabyte GA-X99-Gaming 5
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x99-gaming5_e.pdf
Gigabyte GA-X99-Gaming 7 WIFI
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x99-gaming7-wifi_e.pdf
Gigabyte GA-X99-Gaming G1 WIFI
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x99-gaming-g1-wifi_e.pdf
Gigabyte GA-X99-SOC Force
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x99-soc-force_e.pdf
Gigabyte GA-X99-UD4
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x99-ud4_e.pdf
Gigabyte GA-X99-UD5 WIFI
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x99-ud5-wifi_e.pdf
Gigabyte GA-X99-UD7 WIFI
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x99-ud7-wifi_e.pdf
Gigabyte GA-X99-Gaming 5
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x99-gaming5_e.pdf
Gigabyte GA-X99-Gaming 7 WIFI
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x99-gaming7-wifi_e.pdf
Gigabyte GA-X99-Gaming G1 WIFI
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x99-gaming-g1-wifi_e.pdf
Gigabyte GA-X99-SOC Force
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x99-soc-force_e.pdf
Gigabyte GA-X99-UD4
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x99-ud4_e.pdf
Gigabyte GA-X99-UD5 WIFI
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x99-ud5-wifi_e.pdf
Gigabyte GA-X99-UD7 WIFI
http://download.gigabyte.us/FileList/Manual/mb_manual_ga-x99-ud7-wifi_e.pdf