Recent content by raghu78

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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...
- raghu78
- Post #4,306
- Oct 30, 2020
- Forum: Graphics Cards
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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...
- raghu78
- Post #4,286
- Oct 29, 2020
- Forum: Graphics Cards
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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.
- raghu78
- Post #4,745
- Oct 25, 2020
- Forum: Graphics Cards
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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.
- raghu78
- Post #3,782
- Oct 25, 2020
- Forum: Graphics Cards
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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.
- raghu78
- Post #3,737
- Oct 24, 2020
- Forum: Graphics Cards
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Question Speculation: RDNA2 + CDNA Architectures thread

In GPU market share and overall revenues/profits yes. On performance lets wait for RDNA2 reviews.
- raghu78
- Post #3,680
- Oct 23, 2020
- Forum: Graphics Cards
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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...
- raghu78
- Post #4,734
- Oct 23, 2020
- Forum: Graphics Cards
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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...
- raghu78
- Post #3,641
- Oct 23, 2020
- Forum: Graphics Cards
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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.
- raghu78
- Post #3,207
- Oct 17, 2020
- Forum: Graphics Cards
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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)...
- raghu78
- Post #3,203
- Oct 17, 2020
- Forum: Graphics Cards
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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.
- raghu78
- Post #3,159
- Oct 17, 2020
- Forum: Graphics Cards
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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...
- raghu78
- Post #3,112
- Oct 15, 2020
- Forum: Graphics Cards
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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
- raghu78
- Post #3,100
- Oct 15, 2020
- Forum: Graphics Cards
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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...
- raghu78
- Post #3,054
- Oct 14, 2020
- Forum: Graphics Cards
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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 -...
- raghu78
- Post #3,040
- Oct 14, 2020
- Forum: Graphics Cards

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