P05 is the entry tier in IBM's processor-based software licensing structure for IBM i, sitting below higher tiers like P10, P20, P30, and beyond. The tier a system qualifies for is set by its processor performance rating (a value IBM assigns per model and core activation), not simply by how many physical cores are installed, so two systems with the same core count can land in different tiers depending on configuration. P05 is the tier most small and midsized IBM i shops actually need, and it's usually the more consequential budget number in a small business quote, not the hardware price itself. A reseller quoting a small business Power system should confirm the target license tier early in the conversation, before the buyer anchors on a hardware number that doesn't include the real cost of running IBM i on it.

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