TSMC’s troubled 40nm process has once again hit yield issues. When RV740 (HD 4770) first released in Q2 2009, availability remained poor due to troubled yields reported to be as low as 20-30%. By July, the 40nm yield had improved to a respectable 60%. 

Today, the main 40nm products are AMD’s Juniper and Cypress dies. Nvidia’s GF100 is set to follow, reportedly to release in December. Unfortunately, due to “chamber matching issues”, TSMC report a drop in yield rate from 60% in July to 40% now. The products which suffer most from this yield rate are not mentioned; the 40% value is a general overview of all 40nm products. Both AMD and Nvidia have claimed in the past that their 40nm processes are yielding just fine, though several rumours are afloat as to Nvidia’s troubles with the 40nm process, for the current GT21x shrinks, as well as the upcoming GF100. Meanwhile, the HD 5800 series continues to remain in short supply. 
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TSMC’s troubled 40nm process has once again hit yield issues. When RV740 (HD 4770) first released in Q2 2009, availability remained poor due to troubled yields reported to be as low as 20-30%. By July, the 40nm yield had improved to a respectable 60%. 

Today, the main 40nm products are AMD’s Juniper and Cypress dies. Nvidia’s GF100 is set to follow, reportedly to release in December. Unfortunately, due to “chamber matching issues”, TSMC report a drop in yield rate from 60% in July to 40% now. The products which suffer most from this yield rate are not mentioned; the 40% value is a general overview of all 40nm products. Both AMD and Nvidia have claimed in the past that their 40nm processes are yielding just fine, though several rumours are afloat as to Nvidia’s troubles with the 40nm process, for the current GT21x shrinks, as well as the upcoming GF100. Meanwhile, the HD 5800 series continues to remain in short supply. 
On a positive note, TSMC CEO Morris Chang has vowed to fix all 40nm issues by the end of 2009. 40nm product revenue surged to 4% of all TSMC revenue in Q3 ’09, compared to 1% in Q1 ’09. TSMC expects 40nm products to take a 10% share by the end of 2009. If TSMC can get yield rates up to scratch for both AMD and Nvidia products, that seems like a fair target. 
Reference: Digitimes