AMD: R7xx Speculation
- Thread starter Unknown Soldier
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I don't think so... According that rumors each core will have 32 unified shaders and 8 rops. Maybe each shader have 5 stream processor.... It's look like more reasonable to me. I think that 8 rops, 160sp (32*5) and 8 TMU could fit in a 72 mm^2 die.
Achieving 2 Tp with a similar architecture don't look too difficult: a 1,5 Ghz of shaders frequency give an amount of 1,92 Tp (160 sp*4 cores* 2 flops * 1,5).
Yes, offcourse, i know that
10 mb edram , like Xenos, required almost 100 milion of transistors and they could help GPU only at low-classic resolution with low livell of AA. For appling 8xAA on 1080p, without using tiling, would need more than 32mb. Too big and too expensive
But what the rumors said about shaders and rops, could be a good supposition.
Indeed, it makes you wonder why AMD did not implement it though and instead implemented something that really knocks AA down performance wise.
To be honest this entire thread has started way way too early, the only way out is for B3D to buy AMD around April when it is worth about $30m and then we can order them to do an entire write up on R700 and then the thread can be
CLOSED.
interesting rumor right here
At the end of that thread:
Last week I received word that ATI has taped out their R700 core... That means they are just a few weeks away from having running R700's in the lab. A little insider FYI for you as no one else reported this!
So, I guess we can start calling these Radeon HD 4000s?
At the end of that thread:
leoneazzurro
Regular
Depends if there is need of respins and the such, RV670 seems to have had a very successful first spin, while R600 had some problems, according to what the rumors said. What I heard is that R600 was taped out at the end of Summer/beginning of Fall 2006, but rumors said it took 2-3 respins before coming out.
vertex_shader
Banned
Also, assuming problems are found and fixed instantly, each respin adds ~2 months. 9-12 months is just ridiculous...
For sure AMD not need 3-4 spin to tape out sucesfully a less than 80mm² GPU. (or they need than i'm speechless).
What about when not for respin's the 9-12 months needed, its needed to make acceptable (at highend not 10% faster than r680) multi core products and mature drivers?
BTW. don't forget this
leoneazzurro
Regular
Rumours? Why rumours? The number of spins is always right on the chip! Also, assuming problems are found and fixed instantly, each respin adds ~2 months. 9-12 months is just ridiculous...
If I recall correctly, the R600 launch revision was A13, that is, at least 2 respins needed. That's 4 months at the minimum. So we are talking about tape out-debugging-respin-debugging-respin-production launch, and that's likely to have taken 6-8 months: What I knew is that R600 was taped out in September at the earlier, so that's perfectly compatible with the launch dates. RV670 seemed to not require respins, so it was a pretty successful execution. So, the bottom line is that if R700 has non big problems, we could see even a 4 months between tape out and launch, but if it needs more respins...
Anyway, IF R700 is a multi-chip solution, and each chip has a smaller number of transistors than RV670, I don't expect to have such enormous problems in execution. And, of course, multi-chip drivers are needed...
leoneazzurro: R600 was ready at the end of January 07 - look at the date of R600 at B3D review...
Unknown Soldier
Veteran
But it was only released in what .. May. That was a bad decision at that time(something I said). Last I heard it was driver problems too.
http://www.tomshardware.com/2007/05/14/r600_finally_dx10_hardware_from_ati/
So what we looking at here .. R7xx tapes out now, 6-9(or if you believe 12 months) then AMD might still delay further for driver issues .. add another 3-5 months .. hmm yep .. 2009 release. 1Q09 .. and dare I say 1H09
US
leoneazzurro
Regular
August/September->January =5 months, January was probably first A13 revision, that is going from first spin (A11) to A13 took 5 months, then there have should been the "production and launch" part of the process (because you have to go in mass production in the final spin), which usually takes a couple of months or a little more.
But this needed 2 respins .
If R700 is more successful (à la RV670) then ATI could save 4-5 months respect to R600.
Good news if true. Problem is it's almost impossible to believe anything good coming out of AMD these days.
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