Earlier this week it was speculated that poor yields were to blame for the delay of AMD's Radeon HD 6970 graphics card but today VR Zone claims the real reason behind the delay is a shortage of driver-MOSFET (DrMOS) components from Texas Instruments.
The site heard a final launch date will be decided at the end of this week.
Supply of this DrMOS is limited, and since the Radeon HD 6800 Series and upcoming HD 6900 Series share the same VRM design, any (tight) supply from TI is shared between all the cards. This leads to a delay in HD 6970 card manufacturing, with partners receiving their final boards late as well.
It is interesting to note that AMD has also withheld the final BIOS from partners. It is an open question as to whether NVIDIA's just-launched GeForce GTX 580 flagship GPU and its performance figures has anything to do with this.