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ATI Radeon HD 3450, 3470 and 3650 p
Posted by newsbot on January 23rd 2008

Starting with RV635, AMD has decided that instead of havingseparatePro and XT cards like it did in the Radeon HD 2600 series, it wouldstick with just one model name in the Radeon HD 3650 series. AMD’s IainMcNaughton explained that the company looked at the mainstream segmentand asked itself “what can we do that is different and disruptive toour competitors, while offering more value to our customers?”Despite only offering one model name, there are stilltwo products that fit under this name – both share the same engineclock, which is set at 725MHz (slower than the Radeon HD 2600 XT’sengine clock), and the same number of stream processors as the RadeonHD 2600 series cards (120 stream processors or 24 five-way superscalarshader units) – both also feature a 128-bit memory interface.The number of texture units and raster operators hasn’t changed either,meaning there are still just eight texture units and four rasteroperators (or ROPs). What has changed architecturally now though isthat there is support for DirectX 10.1, PCI-Express 2.0 and ATIPowerPlay at a high level... at a much lower level, I've heard (butstill waiting for confirmation) that AMD has added double precisionsupport at one quarter speed, but it’s not exposed in current 3Dgraphics APIs.RV635 also uses fewer transistors—a total of 378 million—than the RV630chip, which itself featured a pretty massive 390 million of the littleblighters. AMD says that it has made some optimisations during the dieshrink, which should help to improve performance per clock andefficiency a little bit when it’s compared to the ASIC it’s replacingat the same clock speed.

View article at bit-tech.net

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