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  1. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    I am only saying what cache sizes are possible based on what we know about Navi 10 die size of 251 sq mm with 40 CU and 256 bit GDDR6. The Zen 2 L3 cache was roughly 16-17 sq mm for 16 MB L3. The math suggests N23 cannot have 64 MB Infinity Cache with 128b it G6 and only 32 MB. Similarly N22 is...
  2. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Navi 21 has sixteen 64 byte AMD Infinity Fabric channels connecting the cache to the graphics engine. Navi 21 has eight 32 bit GDDR6 memory controllers. So I think AMD is maintaining a ratio of 1:2 (memory channels to cache channels) N21 - 16 channels x 8 MB = 128 MB cache ~ 530 sq mm (256...
  3. R

    Question 'Ampere'/Next-gen gaming uarch speculation thread

    Well said. For folks who upgrade every time a new Nvidia flagship is launched this does not matter. But for folks who want to keep it longer than 2 years the VRAM discussion is important, especially for 4K gaming.
  4. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    RGT has said that quite a while back. Its 60% per CU perf/watt improvement. My guess is even higher if you compare 5700XT to 6900XT.
  5. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Now if only AMD can price the 6800XT at $650 and have good availability then we can truly say consumers are the beneficiary in this next gen GPU wars.
  6. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    In GPU market share and overall revenues/profits yes. On performance lets wait for RDNA2 reviews.
  7. R

    Question 'Ampere'/Next-gen gaming uarch speculation thread

    If RGT is right then 6800XT will match RTX 3080 at 4K and beat it at 1440p and 1080p. Same for RX 6900XT vs RTX 3090. RX 6800 will beat RTX 3070 soundly and thats why Nvidia want a GA102 based 3070 Ti . If AMD price RX 6800 at $500, RX 6800XT at $600 and RX 6900XT at $800 that would be fairly...
  8. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    RGT who has been the most accurate of all leakers till now has been saying for now over a month that 6800XT competes with RTX 3080 and 6900XT with RTX 3090 in rasterization. In ray tracing benchmarks Ampere is ahead. But that is also a function of Nvidia RTX being out for 2 years while RDNA2 is...
  9. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    N24 is not 64 CU. N24 is a small die with 16-20 CU and < 150 sq mm. You have to remember N23 according to Acquariuszi is 240 sq mm.
  10. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    80CU vs 82SM 72CU vs 68SM 72CU vs 68SM What we will see. So if kopite is right and I tie the info VCZ said about XTX having more CU than XT then its obvious that RX 6900 XT = Navi 21 XTX = 80/16GB /128 ROPs (fully enabled) RX 6900 = Navi 21 XT = 72,/16GB/128 ROPs (4 WGP disabled)...
  11. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Yes. Navi 24 is most likely 16-20 CU and will finally retire Polaris after almost 5 years of service. Polaris is probably the longest lived GPU from either GPU vendor in history.
  12. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Total system power consumption is less than RTX 2080 which has a 215w TDP with GPU performance comparable to RTX 2080 Ti (this will be confirmed in a few days when Navi 21 based SKUs launch). The power efficiency of Xbox Series X is very impressive and bodes well for upcoming PC desktop and...
  13. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Zen 2 at 3.66 Ghz (SMT off) draws 55w approx. That 12 TF RDNA2 GPU in Series X is drawing less than 130w. Even against mobile RX 5700M that Series X GPU is atleast >1.5x perf/watt if you account for twice the VRAM capacity https://www.notebookcheck.net/AMD-Radeon-RX-5700M-Mobile-GPU.439543.0.html
  14. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    The binning process is designed to maximize the usage of dies from a wafer. So whatever SKU strategy AMD adopts for Navi 21 will be done to maximize the total product revenue from a wafer of Navi 21 chips. https://www.techpowerup.com/review/amd-radeon-rx-5700-xt/2.html RDNA already moved the...
  15. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    AMD has more than 4 SKUs for Renoir based on a tiny die at roughly 150 sq mm. R7 4800U - 8C,/16T, 8CU R7 4700U - 8C,8T, 7 CU R5 4600U - 6C/12T, 6 CU R5 4500U - 6C/6T, 6 CU R3 4300U - 4C/4T, 5 CU Whats better is they have 4 SKUs for even a tiny 75 sq mm chiplet. R7 3800X - 8C/16T R5 3600X -...
  16. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Big Navi is Navi 21 with 80CU and a die size of > 500 sq mm. Navi 21 is confirmed to have atleast 3 SKUs (some saying 4) . Navi 21 XTX - RX 6900XT - 80CU, Navi 21 XT - RX 6900 - 72 CU, Navi 21 XL - RX 6800XT - 60-64 CU Navi 21 XE - RX 6800 - ? CU Navi 22 is the...
  17. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    I believe AMD showed off RX 6800XT (aka Navi 21 XL 16 GB) with 64 CU. The way I see it even teasing RX 6000 was not necessary unless AMD were very confident of Navi 21. I believe RX 6900XT will be roughly 25% faster than RX 6800XT. So for rasterization I do expect RX 6900XT to take the crown...
  18. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Yeah. But again unless AMD has messed up thats the least you can expect. In reality if perf/clock is higher then RTX 3090 level perf at 4K and better at 1440p is expected.
  19. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    RX 5700XT official game clock is 1755 Mhz but you can see it run anywhere between 1800 - 1850 Mhz depending on game. So if N21 official game clock is 2.2 Ghz we should not be surprised to see it run between 2250-2300 Mhz. So game clock to game clock its roughly 25%. More importantly RDNA2 has...
  20. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Nvidia already has a 3080 Ti coming up. So we already know 3 SKUs are based on the GA102 die. Its not uncommon to see 3 or even 4 SKUs on massive > 500 sq mm dies. I would say there are atleast 3 SKUs based on N21. RX 6800XT, RX 6900, RX 6900XT. My opinion is that AMD did not reveal their...
  21. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Where did you get 13B transistors for Sony PS5 SoC. Did Sony give any numbers ?
  22. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    AMD has said that RDNA2 will have higher perf/clock vs RDNA. How much is still to be seen when the final products arrive. https://www.anandtech.com/show/15591/amds-rdna-2-gets-a-codename-navi-2x-comes-this-year-with-50-improved-perfperwatt
  23. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Well said. These so called tech youtubers lack any real skill, a real job and do not provide any value to anybody. They do provide lots of entertainment with their funny rubbish. They are out to make easy money and lots of people fall for their tricks.
  24. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Well said. These youtubers with so called exclusive info are just pathetic. Bunch of clowns.
  25. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Navi 21 - 4SE, 8SA, 40 WGP / 80 CU, 128 ROPs, 256 bit GDDR6 or 2048 bit HBM2E, 16 GB. My guess is 2048 bit HBM2E and performance on par with RTX 3090 at 275w.
  26. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    I did say in my reply few users might look at the overall package. AMD need a competitive response to DLSS and raytracing and thats obvious. The media engine is important but I do not agree that everyone streams. Having said that each user looks at a certain set of parameters to make his...
  27. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Thats a baseless argument. Nvidia has a stronger brand but that is built on performance leadership for many years. I can bet you if Nvidia did not have the GPU crown consumers would not hesitate to switch to AMD. Maybe few will want to wait for 1 more generation to see if AMD have an overall...
  28. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    So you are saying if AMD have a flagship N21 GPU with 16 GB HBM2E for $1000 or even $1200 which is 5-10% faster than RTX 3090 FE AMD will not sell out every unit they make. I will take a bet with you that they will sell every unit they manufacture.
  29. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Why is everyone surprised that RDNA2 can clock 2.5 Ghz when the Renoir APU with Vega gfx overclocked to 2.4 Ghz. In fact if anything at minimum 2.5 Ghz was to be expected given RDNA2 is AMD's latest and best GPU arch and incorporates the best physical design methodologies utilized by the "Zen"...
  30. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Even lesser. Digitalfoundry measured 155w in Infamous First Light at 4k on PS4 Pro even though it had a 310w rated PSU. https://www.eurogamer.net/articles/digitalfoundry-2016-playstation-4-pro-review Xbox One X had a power draw of 175w with a much smaller 245w rated PSU...
  31. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    In RDNA the instruction cache which is shared per WGP can fetch 32 bytes (2-4 instructions) per clock cycle per SIMD. 4 SIMDs are present in a dual CU WGP. So 4-8 instructions per clock cycle per CU and 8-16 instructions per clock cycle per WGP. RDNA2 does 7 instructions per clock cycle per CU...
  32. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    If a 2SE,4SA, 20WGP/40CU, 64 ROPs, 192 bit GDDR6 RDNA2 graphics card can match a 5 GPC, 38 SM, 80 ROPs, 256 bit GDDR6 Ampere graphics card then the comparisons up the stack will get brutal as AMD is likely to have better scaling due to the 80 CU being 4SE, 8SA, 40 WGP/80CU, 128 ROPs and most...
  33. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    If AMD has intentionally planted incorrect firmware info so that leakers don't get the actual specs then I think even 80 CU might be wrong. I would not be surprised to see 96 CU and 2048 bit HBM2E for the 505 sq mm flagship die.
  34. R

    Question 'Ampere'/Next-gen gaming uarch speculation thread

    The number of GPC increasing by only 1 for the RTX 3090 and remaining same for RTX 3080 compared to RTX 2080 Ti, RTX 2080 Super, RTX 2080 and RTX 3070 is limiting the performance gain at 1440p where its likely to be not purely shader performance bound but geometry bound. At 4K the shader bound...
  35. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Console PSUs are never run anywhere close to the max rated wattage. Xbox One X had a 245w PSU and drew around 172w in GoW4 in anandtech review. There is good reason for that. These consoles have a long lifetime (in some cases 10 years or more) and the PSU wattage output is likely to reduce with...
  36. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    https://www.bloomberg.com/news/articles/2020-09-15/sony-is-said-to-cut-ps5-forecast-by-4-million-due-to-chip-woes
  37. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    Vega 20 was a 331 sq mm die with 4 HBM2 stacks. Navi 21 is likely to be a 500 sq mm die with 2 HBM2E stacks. Not really. It depends on the die area spent for Radeon PRO features like SR-IOV and MXGPU, xGMI (for multi GPU), FP16 etc.
  38. R

    Question Speculation: RDNA2 + CDNA Architectures thread

  39. R

    Question Speculation: RDNA2 + CDNA Architectures thread

    For those interested here is a good explanation on RDNA2
  40. R

    Question 'Ampere'/Next-gen gaming uarch speculation thread

    For those interested here is a good explanation on Ampere
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