And it would contrast Nvidia, because they hadn't decoupled their texturing ops from shader ops, etc. It could be, that you can issue a vector, scaler, vertex fetch, and texture load, all with-in one instruction cycle. Rather than just listing vector and scaler. But I don't think he was implying shader ops. contribs) 02:49, 29 January 2008 (UTC) Yeah, I remember when he said that.Preceding unsigned comment added by Gears, Gears, Gears ( talk One of the lead engineers who was working on the Xenos (His name escapse me at the moment) stated that the xenos is capable of 96 billion shader ops per second, thats twice the ammount stated by Microsoft, Im assuming that the piplines now do 2 vector4 ops and 2 scalar ops, so 4 ops per pipline and 48*4*500,000,000=96,000,000,000 shader ops per second, I dont know if this is true, or what I said just then made any sense, im just wondering if anyone can confirm or disprove this but if its right can you please post this on the article (If im right I think it may effect everything and definetly make the flop count per pipline 20). Swapnil 404 ( talk) 06:49, 15 September 2009 (UTC) Double shader preformance for the Xenos?
I won't modify it personally, but I doubt it'd be written up like that officially. You could just as easily devote more than 1 simd blocks of shader alus to vertex work if you found use for it. (which is a listing of transform rate, not set-up rate)Īnd it lists 16, because that's the number of alus in a single simd block of shaders. I'm not sure how it should technically be listed, but isn't the 1.5 billion figure ad-lib? It's derived from the "500 million" set-up limit, and quoted as if it's the same measure as you see in other gpus. And with a reasonable number of vertex shader instructions (outside of simple transform), you would avoid reaching that limit. That would be the maximum you could actually draw on screen, after back-face and occlusion culling, etc. So, Microsoft listed the "set-up" limit in their specifications. But again, even that wouldn't make sense, for a list of reasons. And technically, 1 block of alus devoted to vertex work, would be 2 billion vertices per second. But it wouldn't make much sense to list that as a per second figure of 6 billion. The problem here, is that (being unified) all of Xenos's alus could potentially be processing geometry at once, such would be the case in the z-only pre-pass. And since all polygons in a mesh could (theoretically) be sharing a vertex with it's neighbor in strips and fans, the theoretical maximum polygon count is sometimes "considered" 1 to 1 with vertex rate. That's true of all gpus from what I can tell. So for every vertex shader you have, = 1/4 the clock frequency. It's my understanding, that typical gpu listings for this figure, calculate vertex shader processing, by assuming it takes 4 clock cycles to complete the simplest vertex positional transform (matrix * vector). So it seems they worked backwards from the "500 million" figures released by Microsoft, and just assumed 1.5 billion vertices from there. I would assume they thought that since a typical polygon is a triangle with three sides, 1.5 billion vertices, would form 500 million polygons. In this article, they seem to have come to a "1.5 billion vertices per second" figure from somewhere. Naming it in similar way Hollywood chip was named Hollywood (graphics_chip) Oldag07 ( talk) 18:13, 9 December 2008 (UTC) So, how was the vertex rate figured? Should it be Xenos (GPU), Xenos GPU or Xenos (graphical processing unit)- ZayZayEM ( talk) 02:09, 11 December 2007 (UTC) I am third his. Other possibilities though would be to point this to the disambiguous page. Would favour Xenos (Greek) under first precendences.- ZayZayEM ( talk) 05:55, 10 December 2007 (UTC) It would make sense to me, as the concept is the source of the other names. No assertion of usage prominence over other uses for " Xenos". 11 Claims of R5xx/x1900/x1800 'base' chip dubious/uncited.7 Image copyright problem with Image:R500gpu.jpg.5 The Xenos does not use the 65nm process yet.3 Double shader preformance for the Xenos?.