The DirectCU line of cards from ASUS are catered to the overclockers out there in the market. The DirectCU has precision mounting, putting the copper heatpipes in direct contact with the GPU for better cooling performance. ASUS has also implemented their SAP, Super Alloy Performance technology, which uses high quality capacitors, MOSFETs, and chokes along with ASUS’s super hybrid engine. They have also equipped the 6870 with multiple sets of input fuses on the circuit board to eliminate any chance of excessive or dangerous temperature rises, which should keep you from frying your video card. The 6870 DirectCU also comes factory overclocked from ASUS to 915MHZ, compared to the stock speed of 900MHz on basic 6870 cards.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips