The NO POST issue on some of the 6xx video card products which are limited to some of the new shipments, however it is unrelated to these OC SKU.
We are shipping with legacy BIOS on new shipments now.
The NO POST (in fact, a hang on POST code B2) is caused by the Hybrid BIOS in the VGA card that has conflict/compatibility issue with older UEFI BIOS without GOP support. GOP support has been introduced with UEFI 2.1 and is required by SecureBoot, thus Win8 compliance (not required by end users).
http://en.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface
The solution is to update the motherboard to the newest UEFI BIOS based on updated UEFI codebase with enabled GOP support (using integrated display or a known working discrete graphics card).
Or update the BIOS on the VGA card on a legacy platform with legacy VGA BIOS ROM. However, if you have no way to update both of your motherboard/vga BIOS then it is recommended to return the product to vendor, or submit a RMA request.