SL9KE - Pentium 4 651 3.40GHz 800MHz FSB 2MB L2 LGA775 65W CPU Processor

This Pentium 4 651 processor is the later SL9KE D0 stepping for compatible legacy desktops, business computers, workstations, servers, and LGA775 motherboards. It operates at 3.40GHz with an 800MT/s front-side bus, 2MB L2 cache, Hyper-Threading Technology, and Intel 64 support.

Unlike earlier 86W Pentium 4 651 revisions, SL9KE uses the cooler-running 65W D0 design. The motherboard BIOS must specifically support the Cedar Mill D0 stepping; an LGA775 socket alone does not confirm compatibility.

Technical Specifications

• Manufacturer: Intel
• Processor Family: Pentium 4
• Processor Number: 651
• sSpec Number: SL9KE
• Core Name: Cedar Mill
• Core Stepping: D0
• CPUID: 0F65h
• Socket: LGA775 / Socket T
• Manufacturing Process: 65nm
• Core / Thread Count: 1 core / 2 threads
• Hyper-Threading: Supported
• Processor Speed: 3.40GHz
• Clock Multiplier: 17x
• Front-Side Bus: 800MT/s
• L2 Cache: 2MB
• Thermal Design Power: 65W
• Thermal Profile: 775_VR_CONFIG_06
• Maximum TCASE: 64.4°C
• VID Voltage Range: 1.200V–1.325V
• Architecture: 64-bit Intel 64
• Instruction Support: MMX, SSE, SSE2, SSE3
• Additional Technologies: Execute Disable Bit, Enhanced Intel SpeedStep, Enhanced Halt State C1E, Thermal Monitor 2
• Intel VT-x: Not supported
• Integrated Graphics: None
• Included Quantity: One processor
• Heatsink / Thermal Grease: Not included

Interchangeable / Replacement Part Numbers

Exact SL9KE D0 / 65W identifiers:

SL9KE, KU339, RT657-69001

Intel processor and packaging order codes:

HH80552PG0962M, BX80552651, BX80552651T, BX80552651T2

Pentium 4 651 production sSpecs and OEM service references:

SL96J, SL94W, SL8WG, PY395, MW529, 418939-001, ER064-69002, 5188-5039, 41D5046, 41D5058, 41T1714

Label, model, and catalog aliases:

0KU339, 0PY395, 0MW529, HHHH80552PG0962, 80552PG0962M2M, ER064AV

Legacy catalog aliases—verify the actual CPU marking before ordering:

ER064-69001, 5188-3650, 5188-6041

Revision Note: SL96J, SL94W, and SL8WG are earlier 86W Pentium 4 651 revisions. They share the same 3.40GHz speed, 800MT/s bus, 2MB cache, and LGA775 package, but they are not the same 65W D0 stepping as SL9KE. When D0 or 65W is specifically required, confirm that SL9KE is printed on the processor.

⭐➕ Recommended Thermal Grease — Sold Separately

Fresh thermal compound should be applied whenever installing this processor or reinstalling the heatsink. Completely remove the old compound from the CPU heat spreader and heatsink base, then apply a thin, even layer of Shin-Etsu G751 High-Performance Thermal Grease before securing the cooler.

Proper application fills microscopic surface gaps and helps transfer heat efficiently from the processor to the heatsink.

✅ Confirmed Compatibility

The following models have documented Pentium 4 651 support, exact D0 motherboard support, or an OEM D0 service mapping. Install the stated BIOS or a later release. For factory systems, update to the latest available BIOS and verify the exact chassis and motherboard revision before installation.

Factory Desktop and Server Systems

✔️ HP Compaq Business Desktops: dc5100 Microtower; dc5700 Microtower and Small Form Factor; dc7600 Ultra-Slim Desktop, Small Form Factor, and Convertible Minitower; dc7700 Small Form Factor and Convertible Minitower; dx2300 Microtower; dx7300 Business PC
✔️ HP Compaq Regional Business Desktops: dx2130 Microtower, dx2200 Microtower, dx2280 Microtower, dx2700 Microtower, dx7380 Microtower
✔️ Dell XPS / Dimension: XPS 410, Dimension 9200; KU339 is the exact D0 service processor—install the latest available BIOS
✔️ Lenovo ThinkCentre A52: Machine Types 8170, 8287, 8299, 8382, 8785, 8786
✔️ Lenovo ThinkCentre E50: Machine Type 8472
✔️ Lenovo ThinkCentre M55e: Machine Types 9380, 9632, 9637, 9649
✔️ Lenovo ThinkCentre A55: Machine Types 8705, 8706, 8975
✔️ Acer Desktop: AcerPower AP2000-UP651C
✔️ Fujitsu Siemens Server: PRIMERGY TX150 S4

Intel Server Boards and Systems

✔️ Intel Server Boards: S3000AH, S3000AHLX, S3000AHV with BIOS R0039 or later
✔️ Intel Server Systems: SR1530AH, SR1530AHLX, SR1530AHNA, SR1530AHLXNA with BIOS R0039 or later

ASUS LGA775 Motherboards and Barebones

✔️ P5B Series: P5B BIOS 0201+, P5B-E 0211+, P5B-E Plus 0405+, P5B-Plus, P5B-V 0117+, P5B Deluxe/WiFi-AP 0405+, P5B Premium, P5B-VM DO 0305+
✔️ P5K Series: P5K 0302+, P5K/EPU 0203+, P5K-E 0201+, P5K PRO 0201+, P5K Deluxe/WiFi-AP 0311+, P5K3 Deluxe/WiFi-AP 0301+, P5K Premium/WiFi-AP 0102+, P5K SE 0204+, P5K SE/EPU 0201+, P5K-VM 0304+, P5K WS 0307+
✔️ P5Q Series: P5Q 0205+, P5Q-E 0506+, P5Q PRO 0205+, P5Q Deluxe 0204+, P5Q-VM 0202+, P5Q-EM 0202+, P5QC 0408+, P5Q SE/R 0405+, P5Q Premium 0508+
✔️ P5LD2 Series: P5LD2 1207+, P5LD2 Deluxe 0704+, P5LD2-VM PCB 1.03G with BIOS 0703+, P5LD2-VM DH 0704+
✔️ Additional Motherboards: P5W DH Deluxe 2103+, P5W64 WS Professional 0116+, P5PL2 PCB 2.00G with BIOS 0703+, P5GPL 0901+, P5MT PCB 1.01G with BIOS 1006+, P5P800 SE 0803+, P5NSLI PCB 1.02 with BIOS 0504+, P5ND2 PCB 1.02G with BIOS 0207+
✔️ Barebones Systems: V2-PE2 BIOS 0201+, V2-PH2 BIOS 0501+

ASRock LGA775 Motherboards

✔️ X48 / X38: X48TurboTwins-WiFi, X38TurboTwins-WiFi, X38TurboTwins
✔️ P45 / P43: P45X3 Deluxe, P45DE3, P45XE-WiFiN, P45XE, P45R2000-WiFi, P45TurboTwins2000, P45TS-R, P45TS, P43 Pro/USB3, P43R1600Twins-WiFi, P43R1600Twins, P43Twins1600, P43DE3, P43DE2
✔️ G43 / G41: G43Twins-FullHD, G41MH/USB3, G41C-GS R2.0, G41M-GS, G41M-S, G41M-VS3 R2.0 BIOS P1.30+, G41M-VS3, G41M-VS2, G41M-VS, G41M-LE
✔️ P35 / G31 / G965 / P965: 4Core1600P35-WiFi+, 4Core1600P35-WiFi, 4Core1600Twins-P35, G31M-GS R2.0 BIOS P1.60+, G31M-S R2.0 BIOS P1.70+, G31M-S, G31M-VS2, G31M-VS, 4Core1600-D800, G965M-S, 4Core1333-Viiv
✔️ 945 / 865: ConRoe1333-eSATA2, ConRoeXFire-eSATA2, Wolfdale1333-D667 R2.0 BIOS P1.20+, ConRoe1333-D667 R1.0, ConRoe1333-DVI/H R2.0, ConRoe945G-DVI, 945GCM-S, 775i945GZ, 775i65G R3.0, 775i65G R2.0 BIOS P2.30+, 775i65G BIOS P2.30+
✔️ NVIDIA / VIA Chipset Boards: N7AD-SLI, Penryn1600SLI-110dB, 4CoreDX90-VSTA R2.0 BIOS P1.30+, 4CoreDX90-VSTA, 4CoreDual-VSTA, 4CoreDual-SATA2 R2.0 BIOS P1.70+, 4CoreDual-SATA2, 775Dual-VSTA BIOS P1.20+

☑️ Key Features

☑️ Exact SL9KE D0 stepping with reduced 65W thermal design
☑️ 3.40GHz operating frequency and 800MT/s front-side bus
☑️ 2MB L2 cache for compatible Cedar Mill platforms
☑️ Hyper-Threading provides two logical processing threads
☑️ Supports Intel 64, Execute Disable Bit, EIST, C1E, and Thermal Monitor 2
☑️ Broad documented support across business desktops, server boards, and retail LGA775 motherboards
☑️ Suitable for legacy system repair, restoration, and exact CPU replacement

⚙️ Fit Notes

• Confirm that the processor supplied is marked SL9KE when the 65W D0 revision is required.
• The motherboard must support LGA775, an 800MT/s FSB, Cedar Mill D0 microcode, and VR_CONFIG_06.
• A matching socket or chipset does not independently confirm processor compatibility.
• Update the BIOS using the currently installed processor before installing SL9KE.
• Earlier SL96J, SL94W, and SL8WG revisions are 86W and may have different BIOS and cooling requirements.
• Use an LGA775 heatsink and fan rated for at least 65W, together with fresh thermal compound.
• This processor has no integrated graphics. The system requires motherboard-integrated chipset graphics or a compatible discrete graphics card.
• Intel VT-x is not supported.
• This processor does not meet Windows 11 processor requirements. Intel 64 support does not guarantee compatibility with modern operating systems or current drivers.