AMD's "Big Navi" GPU may feature up to 80 Compute Units, doubling that of the 5700XT 📦

8    31 Jul 2020 18:31 by u/None

Keep in mind that final silicon almost always has some of the cores disabled in order to improve yields. Big Navi is unlikely to feature more than 72 CU's for the retail version. By comparison the 5700XT has just 40 CU's and is around 47% slower than a 2080 Ti at 1440p (20+ games average). Even without 1:1 scaling of CU's to performance, Big Navi should be faster than a 2080 Ti.

5 comments

1 u/Channu 31 Jul 2020 19:24
Are the chiplets smaller in size? That would explain why they probably put more on one die.
1 u/None [OP] 31 Jul 2020 19:38
AMD GPU's do not use chiplets, they use monolithic die's. To add more CU's you simply increase the die size. The 5700XT has a die size of 251 mm², where as Big Navi is rumored to be around 500mm². GPU makers may use chiplets in the future because the maximum die size is restricted by the reticle limit of the production process. Large die's also have a significantly higher chance of containing defects, which means lower yields and much higher costs. This is why a "monster die" like the Nvidia GA100 (826mm²) costs ten thousand dollars per chip. The reticle limit for 7nm is 858mm², so that chip is right on the edge. Nvidia also had to disable nearly 1000 cores on that chip because the chip is so large that they can't produce enough of them without defects (well, TSMC produces the chips, not Nvidia).
1 u/Channu 31 Jul 2020 19:40
Good to know, thanks.
1 u/None [OP] 31 Jul 2020 20:45
Why is there an Israeli on the TSMC board?
0 u/NitroglycerinLtd 01 Aug 2020 09:37
Why is there an Israeli in your bathtub?