They took it down shortly after it appeared, it was a couple hours ago.
AMD: R7xx Speculation
- Thread starter Unknown Soldier
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They took it down shortly after it appeared, it was a couple hours ago.
Mintmaster
Veteran
"Overall, the card is roughly fifteen percent faster than Radeon 4850, and it will sell for $329 in U.S. e-tail"
We know he's wrong about the performance, but is it really going to sell for $329?
You'll only be waiting for 2.5 hours.
Random question answering from the thread and notes on things, since I won't have anything for NDA expiry (it's already 2am here, I'm not done, and I have work in the morning sadly):
It's the single most impressive graphics processor (and pairing with a memory technology, nice one Joe!) I've ever seen, when looked at as a whole. I don't say that lightly either, there have been some winning chips over the years.
Deeply impressive and really deserves to get ATI back on the map when it comes to performance 3D graphics. Sorry I won't have anything more filling for arch NDA expiry, go read hardware.fr, Tech Report and Morgoth's pieces if you want more data.
***
^infinity, that's honestly the best thing ever
Random question answering from the thread and notes on things, since I won't have anything for NDA expiry (it's already 2am here, I'm not done, and I have work in the morning sadly):
- FP16 filtering is half speed, and the samplers are limited by available interpolators (only 32 texcoords/clk) when processing INT8 at full speed
- 260mm2, 960M transistors or so
- Huge focus on area efficiency and perf/watt
- Chip was pad limited in the beginning***, so the last couple of SIMDs are value adds that weren't originally planned for. Explains the first point a little bit.
- ROPs are mostly 2x everywhere measured with MSAA and really help the chip go fast. ROP MSAA downfilter this time.
- Seems to be 64KiB L1 per sampler with huge L1 bandwidth, new design
- Finding peak rates everywhere on the chip has been easy. I've seen 1Tflop FP32, full bilinear rates and peak INT8 blend and Z-only writes (64 Zs/clock, yay!)
- GDDR5 is really what lets the chip kick some real ass
- GS perf is up compared to RV670, maybe a new (bigger) coalescing stream out cache there, and more threads in flight
- Colour cache is per ROP, same as R6
- 16KiB per SIMD shared memory + 16KiB global (not the SMX)
- All 800 SPs can do integer, fat one only for specials still. 1 FP32 MAD or 1 FP<->INT or 1 integer op/clock for all
- New caching scheme for the RF I think
- Orlando-led design but very distributed in terms of teams. Scott Hartog led, and he worked on i740 at Intel
- Over 5MiB of SRAM on-chip if you count every pool
- New UVD block with 7.1 over HDMI
- No ring bus MC, new controller nice and efficient due to new ROP design
It's the single most impressive graphics processor (and pairing with a memory technology, nice one Joe!) I've ever seen, when looked at as a whole. I don't say that lightly either, there have been some winning chips over the years.
Deeply impressive and really deserves to get ATI back on the map when it comes to performance 3D graphics. Sorry I won't have anything more filling for arch NDA expiry, go read hardware.fr, Tech Report and Morgoth's pieces if you want more data.
***
^infinity, that's honestly the best thing ever
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Ahh that explains the int8 numbers... Test apps using the same coords for multiple textures shouldn't be showing this, though (are there any?)
Not sure I follow this. Why would it be pad limited if it's larger than rv670? Shouldn't it have only a slightly larger pad count?
Really? Surprising to see AMD would get back to fixed function resolve (for basic modes) - with tons of shader alus what's the point?
Hmm I find that hard to believe. The pics don't indicate that.
FYI. This is the "96 Shader" chip Orton talked about some time ago. Things change.
Mintmaster
Veteran
Where the heck are the texcoords interpolated? Odd that it doesn't scale with SIMD count.
Why this wasn't always the case is beyond me...
INT8 Z-only? What do you mean by that?
Ridiculous. We gotta see some GPUBench numbers.
Is this partly due to 1 ROP quad per memory channel, like NVidia's products since G80?
That's some serious praise! I gotta agree with you, though, particularly when looking at ATI's recent track record. Before RV770, I honestly thought NVidia was just more talented.
INT8 blend, sorry about that. My specials rate is wrong, only the fatter unit can do that (corrected that too). Integer for them all though.
The controller seems designed around that being the case, where each quad ROP connects to a 64-bit memory partition and its L2 pool (and other caches).
The controller seems designed around that being the case, where each quad ROP connects to a 64-bit memory partition and its L2 pool (and other caches).
Mintmaster
Veteran
I think lots of apps do this, but I'm not sure about test apps.
I thought 3DMark06 was like this because it always showed higher texture rate than D3DRightMark for G84 onwards, but obviously I was wrong.
I guess it's the power/ground pins, and maybe some more for R700...
Maybe the rate at which samples can be fed back to the shader is limited. Another reason could be that the shaders can do something else in the meantime.
Mintmaster
Veteran
Let's pretend I didn't brainfart and x4 shall weOkay. So you still mean 256 Z/s per clock? Are you talking about reads/tests (i.e. z-rejection rate) or writes?
Does that mean 16xAA with almost no perf hit?
Mintmaster
Veteran
It's presumably all ATI, given the timescales for design, Nice question for us to ask Scott, though, or maybe Wavey knows and can spill the beans. 4am here and the sun is coming up, I'm out for a few hours.
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