Word is going around that AMD will release the ATI Radeon HD 4830 graphics card next week. This card is based on the Radeon HD 4850 but is somewhat slower because it has less shaders and lower clockspeeds.
The card is based on RV770LE core, which is nothing more than RV770PRO with a few pipelines disabled, more conservative clock and lesser bandwidth. This naturally means that this card will end up significantly cheaper than Radeon HD 4850 and it is out and about to fight Geforce 9800GT based products.
The significant detail that we've found out in press time is that the shader number will be dropped from original 800 with RV770XT and PRO chips to 480 with RV770LE in Radeon HD 4830.