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| General information |
| Type | CPU / Microprocessor |
| Family | Intel Pentium 4 |
| Part number | RK80531PC021G0K |
| Processor markings | 80531PC1.5G0K |
| Frequency (GHz) | 1.5 |
| Bus speed (MHz) | 400 |
| Clock multiplier | 15 |
| Package type | 478-pin FC-PGA2 |
| Socket type | Socket 478 (mPGA478B) |
| Architecture / Microarchitecture / Other |
| CPUID | 0F0Ah |
| Core stepping | C1 |
| Processor core | Willamette |
| Manufacturing technology (micron) | 0.18 |
| Number of cores | 1 |
| L2 cache size (KB) | 256 |
| Notes on sSpec QES5 |
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Qualification sample.
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The processor is marked as QES5ES
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Besides the Pentium 4 RK80531PC021G0K, the QES5 S-Spec number was also used by Intel Celeron G1840T
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