3.5. VCC Core Board Current Slew Rate
The VCC core fabric has a very high current slew rate. But some of that is filtered out by the metal-insulator-metal (MIM) capacitors as they provide the lowest impedance to the load because of their proximity. With addition of OPDs, most of the remaining fast edges are filtered out, leaving the board cavity capacitors and voltage regulator capacitors to handle only a fraction of the die level current.
You must ensure the PDN can deliver the current specified at the package balls. Board LC Recommended Filters for Noise Reduction in Combined Power Delivery Rails describes the recommended PCB system-level simulation to ensure the voltage tolerance or specification at package balls are met through the design.
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