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AMD released EPYC 7003 series The (Milan) processor used in the data center more than a year ago. However, according to reports, the chip maker is preparing for an overhaul in Milan, which includes 3D chip stacking.
points leakers ExecutableFix and Patrick Schur sparked concerns about AMD’s implementation of its X3D chip packaging technology with Milan-X. In terms of design, Milan-X retains the Zen 3 core, and may reach 64 cores, just like the vanilla Milan chip. The focus behind X3D is to provide up to 10 times the bandwidth, so Milan-X may use stacked memory chips.
It is not clear what kind of memory AMD will stack on Milan-X. However, the general consensus is high bandwidth memory (HBM). With HBM, Milan-X can provide amazing bandwidth. We don’t know exactly how much bandwidth or capacity there is, because AMD has not disclosed the design to the public.
If we continue with the chart that was shared during AMD Financial Analyst Day 2020, Milan-X has four HBM stacks, one for each chiplet. Assuming Milan-X contains the latest HBM2E modules, each stack can provide up to 16GB and 460GBps of memory bandwidth. In a configuration with four stacks, a single Milan-X chip can finally provide a total of 64GB and 1,840 GBps of memory bandwidth, slightly below the 2 TBps mark.
AMD EPYC Milan-X specifications*
| processor | Core/thread | OPN |
|---|---|---|
| EPYC 7773X | 64/128 | 100-000000504 |
| EPYC 7573X | 32/64 | 100-000000506 |
| EPYC 7473X | 24/48 | 100-000000507 |
| EPYC 7373X | 16/32 | 100-000000508 |
*Specifications have not been confirmed.
points detective momomo_us It is said that the specifications of Milan-X have been discovered. OPN (Order Part Number) is available on AMD’s Product master file So they are legal. According to the leaked information, Milan-X is likely to be launched under the EPYC 7073 series brand, which makes sense, because Milan makes its debut under the name of the 7003 series.
EPYC 7773X seems to be the flagship SKU of the Milan-X series. It is likely to be the Milan-X counterpart of the existing EPYC 7763. Therefore, EPYC 7573X, 7473X, and 7373X may be equivalent to EPYC 7543, 7443, and 7343, respectively. According to momomo_us, Milan-X and Milan share the same core configuration as previously speculated. On the other hand, clock speed is still a mystery. We did notice that there was no mention of the 56-core, 48-core, 28-core or 8-core models of Milan-X. Nevertheless, it seems reasonable that momomo_us has not found them.
Given the design, Milan-X may be a stopgap measure for Intel’s upcoming launch Sapphire Rapids with HBM memory. EPYC Genoa is AMD’s powerhouse and a true competitor of Sapphires Rapid. However, Genoa is not expected to arrive until 2022.
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