AMD is planning a revised Radeon HD 6900 series reference-design PCB. It is reported that the delays which short-supply of TI-made driver-MOSFETs caused have been tided over with, giving AMD the opportunity to redesign the PCB to make use of the more cost-effective yet high-performance VRM circuitry. AMD is reported to have used expensive Volterra-made digital PWM chippery in a last-ditch effort to release the Radeon HD 6900 series in time for the X'mas shopping season, after TI-made VRM components couldn't make it to foundry-partners in time (which caused the launch delay in November, 2010). The redesigned PCB with its new TI-made driver-MOSFETs (DrMOS) could also present an opportunity for AMD to patch the Radeon HD 6950, making stream processor unlocking using BIOS flash impossible, notes the source. This development surfaced after water-cooling major Swiftech announced that it delayed the launch of its Radeon HD 6900 series full-coverage water block because AMD is revising its PCB design.