Bit Tech heard at Computex that TSMC has been working hard to fix the issues of its 40nm process technology. Sources close to AMD told the site the yields of the 40nm Radeon HD 4770 (RV740) are terrible, the chip is currently yielding at around 20 percent and one source claims it's actually below this figure. The yields should start to get better now, but it will still take quite some weeks until there will be enough supply of RV740 GPUs.
Several sources close to AMD have told us that RV740 is currently yielding at around 20 percent, with one source saying that it was actually below this figure. While discussing AMD’s and Nvidia’s plans for later this year, one source told us that there will be another spin of TSMC’s process which “fixes the [yield] issues.”
The source went onto tell us that TSMC expects to start shipping GPUs based on its ‘remixed’ 40nm process later this quarter, which suggests that the 4770’s current availability woes are unlikely to disappear in a matter of weeks – the pressures may not disappear until September at a worst case based on the information we’ve received.