Arm's latest IP announcement, covered by Chips and Cheese, introduces the C2-Ultra core alongside the G2-Ultra NX and CSS N4 IP. The headline number is a maximum 7% IPC improvement for C2-Ultra over its predecessor, C1-Ultra, but Arm later clarified that this figure depends on the parameters shown in the endnotes and does not factor in memory bandwidth improvements.
The clarification matters because memory bandwidth can influence overall performance in ways that are separate from core IPC. By excluding it, Arm is presenting a more conservative estimate of what the microarchitecture itself delivers. The same update also brings the G2-Ultra NX and CSS N4 IP, though the source does not provide detailed performance comparisons for those parts.
Since there is only one source, there are no conflicting accounts to weigh. The key takeaway is that Arm is positioning C2-Ultra as a modest IPC step forward, while expanding its IP portfolio with new NX and CSS offerings aimed at compute and hardware designers.