If you are a chip design house designing graphic processors, and you find that a certain percentage of your chips coming from the foundry does not perform on specification, you have 2 choices. Either you discard them, or you redefine the specification to make it a different product. This particular way is quite usual and AMD shows the latest incarnation of this practice. The AMD Radeon HD 6790 is a cut-down Barts chip targeting the mainstream segment. HT4U.net compares an AMD reference board and a branded version from Sapphire.
You do software updates to get the most from favourite programs right? Updating a motherboard BIOS can in a timely manner is also critical. The guide to Flashing a Motherboard BIOS spells out the often complicated steps in plain english. PCSTATS Tips