The fact that AMD slowed down a little about its future processors for “Rome” EPYC Zen 2-based servers did not prevent speculation about their capabilities. For example, as AMD said that a single Rome EPYC processor could deliver up to 128 PCIe lines, the company did not specify how many lines two processors could deliver on a dual socket server.
According to ServeTheHome.com, there is a clear possibility that EPYC could offer up to 162 PCIe 4.0 lines in a dual-socket configuration, which is 66 tracks more than Intel’s Cascade Lake Xeon dual-socket server. This is even better than Intel’s latest Platinum 9200 56-core 112-series processors, which feature 80 PCIe lanes per double-socket server.
New 7 nm AMD EPYC would offer up to 162 PCIe 4.0 lines
ServeTheHome published a publication focusing on high-performance computing, and @RetiredEngineer on Twitter concluded that two 7nm EPYC CPUs could support 160 PCIe 4.0 lines. In fact, Kennedy expects an additional PCIe line per CPU (i.e., 129 lines in a single socket), bringing the total number of lines in a double socket server to 162.
If the calculations and theories are correct, then Intel has even more competition than AMD has shown. Intel’s latest Cascade Lake architecture will face great challenges against Rome despite up to 56 cores. The new Rome processors have eight more cores, a new 7nm TSMC node, probably lower price and power consumption, and perhaps significantly more PCIe lanes.
Although AMD is facing a tough battle for the server market, the advantages of the 7 nm EPYC hardware over Xeon will certainly attract many data center and server companies.