AMD will cut all Radeon X1300 series and renominate the RV516/RV505 to Radeon X1550, giving them a bit more overclocking power.
AMD has announced to the market that Radeon X1550 is ready to ship in Mid-Jan 2007 to replace the old X1300 series. In addition, Radeon X1600PRO (RV530PRO) has also re-nominated to Radeon X1650 as well. In short, Radeon X1300PRO is cut, while Radeon X1300 is re-nominated to Radeon X1550.
ATI Radeon X1550 has two souls, 80nm RV516 or RV505PRO. These cores are manufactured by TSMC (RV516) and UMC (RV505PRO), same designs but different manufacturers. The default clock speed is now 550MHz, 150MHz higher than Radeon X1300. However, since the core is fabricated with 80nm process, AMD confirmed that the core is capable to be over-clocked to 600MHz without any change to the core voltage, and manufactures are also approved to give a over-clocked Radeon X1550 special version to the market, which may be running at 700MHz with additional voltage and improved heat-sink.