G80 IS PROVED TO HAVE 160 STREAM PROCESSORS AFTER ALL

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POSTER: Erik Larsson   ||   G80 IS PROVED TO HAVE 160 STREAM PROCESSORS AFTER ALL	DATE:2007-04-02
UPDATED DATA... Engineering findings prove it... An engineer from Saarland University in Germany publicly said that G80 has 160 stream processors. He said this at their CeBIT presentation. The rest of the world knows that the G80 is supposed to have 128 only. It's proven that the G80 chip used in current NVIDIA 8800 GTX/GTS cards is equipped with 160 stream processors instead of 128 like NVIDIA uses to publish. This report is based on the findings of Professor Philipp Slusallek working in Germany on the Saarland University. His team is dedicated to 'SaarCOR', a hardware architecture which implements the ray-tracing algorithm on a single chip in order to get realistic images of 3D environments in realtime. He is quite experienced with computer graphics hardware and is insisting the G80 has more than 128 stream processors. The remaining ones may be enabled using a new driver in the future to compete with ATI's R600. To try to confirm the data about the "160" Stream Processors I contacted my nVIDIA source who's an nVIDIA engineer as well and he said the followings:"We have designed the G80 with 160 Stream processors in mind etc. grouped in 10 clusters by 16 Stream processors..but we enabled only 128 SPs with the 8800GTX SKU...Since they are all scalar they don't take much of a transistor budget so 160 Scalar AULs are well possible considering G80 has a total of 750M transistors (681M for main shader core & 72M for the NVI/0 die)...so we designed our G80 arch with 160 Stream Processors in mind and enable the rest of the SPs on a later stage..probably on 80nm.. " Asking him whether we will have 160 SPs on the upcoming 8800 Ultra he replyed : "Since 8800Ultra is based on the same 90nm G80 as the 8800GTX it consumes alot of power and yields are not good so 8800 Ultra will not have 160 Stream Processors but only 128 enabled..despite the rest of the 32 SPs are already there , albeit idle and disabled..." Asking the same nVIDIA source about when will nVIDIA enable the whole 160 SPs he replyed :"Once we move towards 80nm process & lower process with the G80 we'll have the means to enable the entire chip with it's 160 SPs e.q..better yields and low power draw.." The same source is informing me that we'll see 160 Stream Processors within the GeForce 8900GTX (80/65nm) to be released in June/July timeframe along with other members of the "8900" family of products.. Once those 160 Stream Processors are enabled in future 8900 SKUs we'll have a performance boost not only in the shader arena but also in the texture arena since those 10 shader clusters include Texture filtering and Texture addressing as well.. 160 Stream Processors means total of 80 TF Units and 40 TA Units.. There is to believe that these hardware enthusiasts with PhD's know what they are talking about, and there is a strong belief that Nvidia actually enabled 128 streaming processors only and is keeping the rest of them for a later date. All this can be done in the driver, as you can enable as much stream processors as you like and you can enable the rest when the time is right, e.g. when ATI releases its R600 chip or right after in the form of "8900 series". We will try to find more about it, but we think we are on a fine lead. It would be cool if he is right, for maybe he has pre-announced Nvidia's next chip. Only Time will tell... Related Products :

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