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Thread: AMD RV770 has 900 stream processors (4800 series GPU)

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    Default AMD RV770 has 900 stream processors (4800 series GPU)

    Intresting Info about the RV770!!

    The Finnish member largon of the English-speaking Xtremesystems-forum has made an interesting discovery by having a look at the RV770-GPU. To be exact he looked at the SIMD-cores of the chip on a schemata-subscription and came to a surprising conclusion.
    On the RV770 there are 180 instead of 160 vec5-units synonymic with 900 instead of 800 streamprocessors. But one by one:

    The current picture shows the SIMD-cores of the RV770. The row by row to ten numbered figures correspond to the SIMD-units of AMD-GPU. The column by column to nine numbered figures the shader clusters per SIMD, in which two shader units are located. Consequently, it has 18 shader cores per SIMD-unit.
    The product of both numbers is the count of vec5-units, so 180 (10*18). Because every vec5-unit – as the name says – has five different scalar units (RGBA, red green, blue, alpha stock, special function) you can speak of 900 stream processors.



    But what does our schemata-subscription tell us? In reality the RV770 has only 800 stream processors from ten SIMD-units and 16 instead of 18 shader cores per SIMD.
    We can speculate that AMD could have obstructed two extra shader cores per SIMD only to increase the yieldrate of the chip. Are one or two shader cores per SIMD-unit broken the chip must not be directly trashed.

    Underhand you could also wonder if AMD could activate the two disabled shader units per SIMD in a prospective video card. 900 instead of 800 streamprocessors would be synonymic with a 12.5 per cent higher shader performance on the paper.
    But this is more than improbable: The shader cores have to be always a multiple of four because quads – groups of four pixels – must be calculated. The extra shaders could be used as coprocessors to calculate GPGPU-applications.

    An interesting detail, that finds first six months after the official presentation the why outwards.

    Giddy can be traced back to the same Germanic root *gud– that has given us the word God

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    Default Re: AMD RV770 has 900 stream processors (4800 series GPU)

    :O :O :O I hope they find a way to enable some

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    Default Re: AMD RV770 has 900 stream processors (4800 series GPU)

    nice find

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    Default Re: AMD RV770 has 900 stream processors (4800 series GPU)

    I think its highly unlikely that these are actual redundant streaming processors since they look different from the other rows, and AMD hinted already that there was no redundancy for the 48xx series of GPU's since the yields were so high (small die size, unlike nvidias)

    just watch out for the 40nm RV740. and also, probably a higher clocked 4870 based on the same process, to compete with the 55nm refresh of the GTX2xx series.

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    Default Re: AMD RV770 has 900 stream processors (4800 series GPU)

    is there any rumors about "lil dragon "?????????

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    Default Re: AMD RV770 has 900 stream processors (4800 series GPU)

    RV770 die may look small if compared to nvidia's die, but its still huge compared to a CPU die. I wonder how gud the yeilds are..

    Giddy can be traced back to the same Germanic root *gud– that has given us the word God

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    Default Re: AMD RV770 has 900 stream processors (4800 series GPU)

    yields are very good in fact, and at 260mm^2 the die size is the same as Core i7's 265mm^2...

    yields are excellent, unlike nvidia who are still suffering. also, redundancy is also being used to create the HD 4830 which has 2 SIMD clusters disabled, hence 160 shaders are disabled for the cores which dont have all working streaming processors

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