The Inquirer reports ATI has delayed the switch to the 80nm processor for unknown reasons, but likely it's a yield problem.
The chip-maker was supposed to transition its mainstream and entry-level chippery to this smaller architecture but it won't happen by Computex as originally expected.
So, RV535, ATIs 80-nanometre mainstream part, RV560, ATIs 80-nanometre performance part and RV570, ATIs other 80-nanometre performance part are delayed at least till end of summer, we think September at the earliest.
It has to be about the yields. And it seems ATI will have to keep its R520, Radeon X1800 GTO and upcoming Radeon X1900 GT, breathing for a few months more than it originally planned.