4 ms·
Bergamo (server chips) are 4c-only machines, so you could look at benchmarks for those. They're pretty impressive.
by atq2119 3y ago
Bergamo (server chips) are 4c-only machines, so you could look at benchmarks for those. They're pretty impressive.
- brucethemoose2 3y agoAnd the key here is they are using 16-core CCDs. The IO die is not even fully populated! I'm sure there is a technical reason they didn't make Bergamo bigger (bandwidth starvation?), but it almost feels like they are trying not to clobber Intel too hard.
- adgjlsfhk1 3y agoI think the bigger part is that they are running out of bandwidth to feed the cores. They already bumped the ram up to 12 channel, and the chip is already mostly cache. They could pretty easily make a 256 core chip if they wanted, but those cores would spend all of their time waiting for data.
- brucethemoose2 3y agoAnd if they build 3D cache capability into the Bergamo CCD, that would still blow up the die size (from the TSVs) and not alleviate some workloads anyway. For the Zen 3 generation, AMD quietly mentioned that they skipped the 5950X3D because there was too much congestion between the CCDs, thanks to all the extra L3 they were trying to access. The IF links got saturated. Maybe something similar would happen to Bergamo as well. Even if there's enough memory bandwidth, the IO die just gets saturated with all the CCD slots active.