New 478-pin micro-PGA package for desktop Pentium 4 microprocessors was introduced in August 2001 together with 1.9 GHz and 2 GHz versions of Pentium 4s. Almost full line of Willamette CPUs, starting from this Pentium 4 1.4 GHz, was also converted to use the brand-new 478-pin package. This package, compatible with socket 478 motherboards, had 35% smaller width and height, and 57% smaller package area than original Pentium 4 CPUs. This reduction in size was achieved by cutting distance between pins in half. The smaller package was the major change in socket 478 Willamette processors. There were also minor differences between socket 423 and 478 versions of Pentium 4 in electrical characteristics, maximum operating temperature and Thermal Design Power. All major CPU features, such as micro-architecture, size of cache memory, support for SIMD instructions, etc, stayed the same on socket 478 Willamette processors.
Socket 478 Willamettes do not have any performance advantage over socket 423 CPUs, but they provide much better upgrade path. In most cases, this 1.4 GHz CPU can be upgraded to 2.6 GHz Pentium 4 with 400 MHz FSB, or, even to faster, but significantly more rare, 2.8 GHz and 3 GHz Pentium 4s with 400 MHz FSB. Socket 423 CPUs can be upgraded to Pentium 4 2 GHz. Although socket 423 motherboards can be used with faster socket 478 processors, you will need to buy a special socket 423-to-478 adapter for that, and the cost of the adapter is usually higher than the cost of the Pentium 4 2.6 GHz, even years after Pentium 4 family became obsolete. Other upgrade options for this socket 478 Pentium 4 CPU depend primarily on the motherboard. If the motherboard supports 533 MHz FSB then you should be able to upgrade to Pentium 4 3.06 GHz with Northwood core. If, by any chance, the motherboard supports 800 MHz FSB, then you may be able to upgrade to Pentium 4 3.4 GHz, or, if the Prescott core is supported by your board, to Pentium 3.8 GHz. For more details on upgrade options please click on the Socket 478 link on this page.
Intel Pentium 4 1.4 GHz specifications
|Type||CPU / Microprocessor|
|Family||Intel Pentium 4|
|CPU part numbers||RK80531PC017G0K is an OEM/tray microprocessor|
BX80531NK140G is a boxed microprocessor
|Frequency ? ||1400 MHz|
|Bus speed ? ||400 MHz|
|Clock multiplier ? ||14|
|Package||478-pin Flip-Chip Pin Grid Array (FC-PGA2)|
|Socket||Socket 478 / mPGA478B|
|Architecture / Microarchitecture|
|Processor core ? ||Willamette|
|Core steppings ? ||C1 (SL59U, SL5N7)|
D0 (SL5TG, SL5UE)
|CPUIDs||F0A (SL59U, SL5N7)|
F12 (SL5TG, SL5UE)
|Manufacturing process||0.18 micron|
42 million transistors
|Data width||32 bit|
|The number of cores||1|
|The number of threads||1|
|Floating Point Unit||Integrated|
|Level 1 cache size ? ||8 KB|
|Level 2 cache size ? ||256 KB 8-way associative full-speed on-die cache|
- MMX instructions
- SSE / Streaming SIMD Extensions
- SSE2 / Streaming SIMD Extensions 2
|Low power features|
- System Management Mode
- Auto-HALT mode ?
- Stop Grant mode ?
- Sleep mode ?
- Deep Sleep mode ?
|Electrical / Thermal parameters|
|V core ? ||1.75V|
|Minimum/Maximum operating temperature ? ||5°C - 72°C|
|Minimum/Maximum power dissipation ? ||21.2 Watt (Stop Grant mode) / 69.1 Watt|
|Thermal Design Power ? ||55.3 Watt|
|Notes on Intel RK80531PC017G0K|
- Bus frequency is 100 MHz. Because the processor uses Quad Data Rate bus the effective bus speed is 400 MHz.
CPUs, related to Intel Pentium 4 1.4 GHz (RK80531PC017G0K)
• Highlighted numbers and features indicate whether specific processor performs better or worse than the Pentium 4 1.4 GHz (RK80531PC017G0K)
• Within each category, the CPUs are sorted from slower (at the top) to faster (at the bottom)
• List of related CPUs is not complete.
• Features abbreviations:
SSE3 - SSE3 instructions
HT - Hyper-Threading
Q: I have an Intel Pentium 4 1.4 GHz processor. Can I upgrade it?
A: Probably yes. CPU compatibility is determined by your motherboard. Please see CPU-Upgrade.com website for CPU support list for your board.
Intel Pentium 4 1.4 GHz Overclocking
Sorry, overclocking information is not available at this time.
CPU ID (1)
CPUID features of Intel Pentium 4 1400 MHz
NOTE: The CPU ID information below was taken from one CPU and
may include features that are not present in all different steppings of the
Intel Pentium 4 1400 MHz CPU.
|CPU Family:||Pentium 4|
|Processor Number:||1400 MHz|
|Processor name (BIOS):|| Intel(R) Pentium(R) 4 CPU 1400MHz|
|Processor type:||Original OEM Processor|
|Model:|| 0 (00h)|
|TLB/Cache details:||Data TLB: 4-KB or 4-MB pages, fully associative, 64 entries|
Instruction TLB: 4-KB, 2-MB or 4-MB pages, fully associative, 64 entries
No 2nd-level cache or, if processor contains a valid 2nd-level cache, no 3rd-level cache
|Instruction set extensions||Additional instructions|
|Major features||Other features|
|On-chip Floating Point Unit
||36-bit page-size extensions|
||Advanced programmable interrupt controller|
||Machine check architecture|
||Machine check exception|
||Memory-type range registers|
||Page attribute table|
||Page global extension|
||Page-size extensions (4MB pages)|
||Physical address extensions|
||Thermal monitor and software controlled clock facilities|
||Time stamp counter|
||Virtual 8086-mode enhancements|
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