AMD unleashes 55nm HD 3470 and HD 3650
Thursday 24th January 2008, 12:40:00 PM, written by Arun
We can also confirm that, unlike what some rumours implied in the last few weeks, power for HD 34xx and HD 3650 (RV620 and RV635 respectively) is actually lower than for their 65nm equivalents. Core and memory clock speeds for HD 3450/3470 are 600/500 and 800/950, respectively. This is a nice boost compared to 525/400 and 700/800 for RV610.
The HD 3650 doesn’t look quite as exciting, however, as its performance is presumably mid-way between the 2600 Pro and the 2600 XT, with the core clock at 725MHz and memory clock being 800MHz. AIBs are actually free to put on 500MHz DDR2, so make sure you check what model you’re buying before thinking you’ve just found an incredible deal!
Die sizes, as measured by expreview, are 66.5mm² and 120mm² for RV620 and RV635 respectively, compared to 78.75mm² and 149.25mm² for RV610 and RV630. That represents die shrinks of 15.5% and 19.5% respectively, which is about what you’d expect given the theoretical die shrink of 19% for 55nm. Both chips are shipping on their first spin, just like RV670.
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