SLAWQ Intel Core 2 Quad Q9550 2.83GHz 1333MHz 12MB LGA775 95W Quad-Core CPU Processor

The Intel Core 2 Quad Q9550 is a standard 95W Yorkfield desktop processor with four cores, a 2.83GHz clock speed, 12MB of L2 cache, a 1333MHz front-side bus, and an LGA775 package. It is designed for compatible desktop motherboards and systems that explicitly support 45nm Core 2 Quad processors with a 95W thermal design.

Supplied markings and stepping can vary among the interchangeable references listed below. Every reference in this item identifies the standard 95W Q9550. The 65W Q9550S is a different processor and is not included with this item.

Technical Specifications

• Primary Part Number: SLAWQ
• Product Type: CPU processor
• Processor Model: Intel Core 2 Quad Q9550
• Processor Family: Intel Core 2 Quad
• Architecture / Code Name: Yorkfield
• Market Segment: Desktop
• Socket: LGA775 / Socket T
• Package Type: 775-land FC-LGA
• Core Count: 4
• Thread Count: 4
• Base Clock Speed: 2.83GHz
• Bus Speed: 1333 MT/s front-side bus, commonly listed as 1333MHz
• Clock Multiplier: 8.5x
• L2 Cache: 12MB total, implemented as two 6MB cache blocks
• Manufacturing Process: 45nm
• Thermal Design Power: 95W
• Thermal Specification: 71.4°C TCASE
• VID Voltage Range: 0.8500V to 1.3625V
• Transistor Count: Approximately 820 million
• Die Size: Approximately 214mm²
• Instruction Set: 64-bit with MMX, SSE, SSE2, SSE3, SSSE3, and SSE4.1 support
• Processor Technologies: Intel Virtualization Technology, Enhanced Intel SpeedStep Technology, Execute Disable Bit, and thermal monitoring
• Integrated Graphics: None; a motherboard-integrated or discrete graphics solution is required
• Standard sSpec Codes: SLAN4 for C0 stepping, SLAWQ for C1 stepping, and SLB8V for E0 stepping; some listed service references identify the processor by an OEM part number instead, so confirm the revision from the top-side sSpec marking when needed
• Release Period: First quarter of 2008
• Quantity Included: One processor

The 12MB cache is arranged as two 6MB L2 blocks, with each block shared by one pair of processor cores. The 1333MHz listing language refers to the effective 1333 MT/s front-side-bus data rate.

Interchangeable / Replacement Part Numbers

SLAWQ, C865D, P067D, 465758-001, F886J, KC916-69002, 497294-001, SLB8V, BX80569Q9550, 5189-3902, C756C

These references identify the standard 95W Core 2 Quad Q9550. The boxed ordering code and some service references can cover more than one production stepping, so use the processor's top-side sSpec marking when a motherboard or system requires a particular revision.

⭐ Recommended Thermal Paste

For installation, we recommend Shin-Etsu G751 High Performance Thermal Grease to help create proper thermal contact between the processor heat spreader and a compatible heatsink.

✅ Confirmed Compatibility

The list below is not exhaustive. Compatibility requires an LGA775 motherboard with explicit 45nm Core 2 Quad Q9550 support, a 1333 MT/s front-side bus, a 95W-capable voltage regulator and cooling system, and suitable firmware. Install the latest stable firmware with the currently working processor before changing the CPU. The ASRock entries and the first ASUS group explicitly support C0, C1, and E0 revisions. Every stepping-limited entry states the exact revision to request.

ASUS Motherboards - C0 C1 and E0
✔️ ASUS P5QL and P5KPL Boards: P5QL/EPU PCB 1.00G with BIOS 0303 or later and P5KPL/EPU PCB 1.01G with BIOS 0215 or later
✔️ ASUS Maximus and GeForce Boards: Maximus II Gene with BIOS 0223 or later and P5N-VM WS with BIOS 0601 or later
✔️ ASUS G41 and P41 Boards: P5G41T-M LX2 with BIOS 0313 or later, P5G41T-M LX3 with BIOS 0209 or later, P5P41T/USB3 with BIOS 0307 or later, P5P41T with BIOS 0208 or later, and P5P41T LE PCB 1.00G with BIOS 0204 or later
✔️ ASUS QPL and G41 Boards: P5QPL-AM PCB 1.00G with BIOS 0201 or later, P5QPL-VM EPU PCB 1.00G with BIOS 0205 or later, P5QL-VM EPU PCB 1.01G with BIOS 0205 or later, and P5G41-M PCB 1.00G with BIOS 0304 or later
✔️ ASUS P43 Boards: P5P43TD PRO PCB 1.02G with BIOS 0214 or later and P5P43TD/USB3 with BIOS 0204 or later
✔️ ASUS P5W DH Deluxe: Supports C0, C1, and E0 with BIOS 2103 or later under the manufacturer's optional 45nm processor support designation

ASUS Motherboards - SLAWQ C1 or SLB8V E0 Required
✔️ ASUS P5Q Series - C1 or E0: P5Q Deluxe with BIOS 1003 or later, P5Q PRO with BIOS 1004 or later, P5Q-E with BIOS 1003 or later, P5Q SE with BIOS 0502 or later, P5Q SE/R with BIOS 0502 or later, and P5Q SE2 PCB 1.00G with BIOS 0305 or later; request SLAWQ or SLB8V
✔️ ASUS P5QL Series - C1 or E0: P5QL PRO with BIOS 0410 or later and P5QL-E with BIOS 0702 or later; request SLAWQ or SLB8V
✔️ ASUS P5K Series - C1 or E0: P5K with BIOS 1103 or later, P5K-E with BIOS 1102 or later, P5K SE with BIOS 1104 or later, and P5K3 Deluxe/WiFi-AP with BIOS 1103 or later; request SLAWQ or SLB8V
✔️ ASUS P5KPL Series - C1 or E0: P5KPL-VM with BIOS 0902 or later, P5KPL-C with BIOS 0401 or later, P5KPL-CM with BIOS 0514 or later, and P5KPL-AM/BR with BIOS 0312 or later; request SLAWQ or SLB8V
✔️ ASUS Performance and GeForce Boards - C1 or E0: P5E with BIOS 0901 or later, Rampage Formula with BIOS 0407 or later, Maximus II Formula with BIOS 0802 or later, P5N-EM HDMI with BIOS 0305 or later, P5G41C-M LX with BIOS 0305 or later, and P5G41T-M LX with BIOS 0301 or later; request SLAWQ or SLB8V
✔️ ASUS Barebone Platforms - C1 or E0: T3-P5G31A with BIOS 0207 or later, T4-P5G43 with BIOS 0403 or later, and P4-P5N9300 with BIOS 0403 or later; request SLAWQ or SLB8V

BIOSTAR Motherboard - SLAWQ C1 or SLB8V E0 Required
✔️ BIOSTAR GF7050V-M7 Ver. 6.x - C1 or E0: Supports the standard 95W Q9550 C1 and E0 revisions; install the latest available motherboard firmware and request SLAWQ or SLB8V

ASRock models shown without a minimum version are listed for Q9550 support across all published firmware versions. The latest stable version is still recommended before installation.
✔️ ASRock X48 and X38 Boards: X48TurboTwins-WiFi with BIOS P1.20 or later, X48TurboTwins with BIOS P1.10 or later, X38TurboTwins-WiFi, and X38TurboTwins
✔️ ASRock P45 Performance Boards: P45X3 Deluxe, P45DE3, P45XE-WiFiN, P45XE-R, P45XE, P45TS-R, and P45TS
✔️ ASRock P45 Boards with Minimum Firmware: P45R2000-WiFi with BIOS P1.20 or later, P45R2000 with BIOS P1.10 or later, P45TurboTwins2000 with BIOS P1.20 or later, and P45DE with BIOS P1.60 or later
✔️ ASRock P43 Boards: P43 Pro/USB3, P43DE3, P43DE3L, P43DE2, P43DE, P43C-ME, and P43ME
✔️ ASRock P43 Boards with Minimum Firmware: P43R1600Twins-WiFi with BIOS P1.20 or later, P43R1600Twins-110dB with BIOS P1.10 or later, P43R1600Twins with BIOS P1.20 or later, P43D1600Twins-1394 with BIOS P1.20 or later, P43D1600Twins with BIOS P1.10 or later, and P43Twins1600 with BIOS P1.20 or later
✔️ ASRock G43 Board: G43Twins-FullHD
✔️ ASRock G41 and P41 Boards: G41MH/USB3, P41C-DE, G41C-GS R2.0, G41C-GS, G41C-S, G41C-VS, G41M-PS, G41M-GE3, G41MH-GE, G41M-GS3, G41M-S3, G41M-GS, G41M-S, G41M-VS3, G41M-VS2, G41M-VS, G41MH-LE3, and G41M-LE
✔️ ASRock G41 Board with Minimum Firmware: G41M-VS3 R2.0 with BIOS P1.30 or later
✔️ ASRock P35 Boards: 4Core1600Twins-P35 with BIOS P1.40 or later, 4Core1600-GLAN with BIOS P1.10 or later, 4Core1333-GLAN R2.0 with BIOS P1.30 or later, and 4Core1333-GLAN with BIOS P1.30 or later
✔️ ASRock G31 Boards: G31DE, G31M-GS, G31M-S, G31M-VS2, and G31M-VS
✔️ ASRock G31 Boards with Minimum Firmware: G31M-GS R2.0 with BIOS P1.60 or later and G31M-S R2.0 with BIOS P1.70 or later
✔️ ASRock 4Core1600 G31 Boards: 4Core1600-DVI with BIOS P1.10 or later, 4Core1600-D800 with BIOS P1.10 or later, and 4Core1600-GLAN/M with BIOS P1.10 or later
✔️ ASRock G965 and 945 Boards: G965M-S, P5B-DE, P5B Pro, 945GCM-S, and 4Core1333-Viiv with BIOS P1.60 or later
✔️ ASRock GeForce Boards: N7AD-SLI, N73PV-S, and N73V-S
✔️ ASRock GeForce Boards with Minimum Firmware: Penryn1600SLIX3-WiFi with BIOS P1.20 or later, Penryn1600SLI-110dB with BIOS P1.40 or later, and 4CoreN73PV-HD720p R1.0 with BIOS P1.40 or later
✔️ HP xw4600 Workstation: Supports the standard 95W Q9550 2.83GHz processor; retain the 95W-rated workstation heatsink, fan, and airflow components
✔️ HP Compaq dc7900 Systems: dc7900 Convertible Minitower and dc7900 Small Form Factor configurations that list the standard Q9550 processor; this entry does not apply to the Ultra-slim Desktop
✔️ HP Compaq dx7500 Systems: dx7500 Microtower and dx7500 Small Form Factor configurations that list the standard Q9550 processor
✔️ HP Compaq dx2310 and dx2318 Systems: dx2310 Microtower and dx2318 Microtower configurations that list the standard Q9550 processor
✔️ HP Compaq 6000 and 6080 Pro Systems: 6000 Pro Microtower, 6000 Pro Small Form Factor, and 6080 Pro Microtower configurations that list the standard Q9550 processor
✔️ HP Compaq 8000 Elite Small Form Factor: Supports the standard Q9550 under service reference 465758-001; use the 95W processor cooling assembly and do not substitute the separately listed lower-power processor family
✔️ HP Pro 3000 and 3080 Systems: Pro 3000 Microtower, Pro 3000 Small Form Factor, and Pro 3080 Microtower configurations that list the standard Q9550 processor
✔️ HP Pro 3010 Microtower: Supports configurations that list the standard Q9550 processor
✔️ OptiPlex 380 Systems: Mini Tower, Desktop, and Small Form Factor configurations that list the standard Q9550
✔️ OptiPlex 760 Systems: Mini Tower, Desktop, and Small Form Factor configurations that list the standard Q9550; the Ultra Small Form Factor chassis is excluded
✔️ OptiPlex 780 Systems: Mini Tower, Desktop, and Small Form Factor configurations that list the standard Q9550; the Ultra Small Form Factor chassis is excluded
✔️ OptiPlex 960 Systems: Mini Tower, Desktop, and Small Form Factor configurations that list the standard Q9550; the Ultra Small Form Factor chassis is excluded
✔️ OptiPlex 755 - F886J E0 Service Configuration: Compatible only when using the final system firmware and the chassis-appropriate 95W cooling assembly; request the F886J E0 processor for this late service configuration, and do not use an Ultra Small Form Factor chassis
✔️ XPS 420 - C865D C1 Service Configuration: Supports the C865D Q9550 C1 service processor with the final system firmware and original 95W tower cooling assembly; request C865D for this exact configuration
✔️ Acer Veriton M265 Microtower: Supports both the documented C1 and E0 standard Q9550 service revisions; install the latest system firmware before changing revisions
✔️ Acer Veriton M275 Microtower: Supports the documented E0 standard Q9550 service revision; request an E0 processor such as SLB8V or F886J for this system
✔️ Acer Aspire X1700 and Veriton X270: Their joint service documentation lists the standard 95W Q9550; preserve the model-specific heatsink, fan, ducting, and power-supply configuration
✔️ Acer Aspire X3810 and X5810: Their joint processor matrix lists the standard Q9550; verify the exact system board and install current firmware before the CPU change
✔️ Acer Aspire M3802 and M3802G: Support the documented E0 standard Q9550 service revision; request an E0 processor such as SLB8V or F886J
✔️ Acer Aspire M5800 ASM5800-A38: This exact factory configuration uses the standard Q9550; match the complete ASM5800-A38 configuration rather than assuming support across every M5800 variant
✔️ Fujitsu CELSIUS Workstations: CELSIUS M460 and CELSIUS W360 configurations offered with the standard Q9550 2.83GHz 12MB 1333MHz processor
✔️ Fujitsu ESPRIMO E Series: ESPRIMO E5730 E-Star 4.0, E5731 E-Star 5.0, and E5731 E85+ configurations offered with the standard Q9550
✔️ Fujitsu ESPRIMO P3520 and P3521 Systems: ESPRIMO P3520 E85+ and ESPRIMO P3521 E-Star 5 configurations offered with the standard Q9550
✔️ Fujitsu ESPRIMO P5730 and P5731 Systems: ESPRIMO P5730 and ESPRIMO P5731 E85+ configurations offered with the standard Q9550
✔️ Fujitsu ESPRIMO P7935 and P7936 Systems: ESPRIMO P7935 E80+, P7935 E-Star 5.0, P7935 0-Watt, and P7936 0-Watt configurations offered with the standard Q9550

Sun Workstation
✔️ Sun Ultra 24 Workstation: Supports the standard Q9550 2.83GHz 12MB 1333MHz processor module in the documented 4107A-Z configuration; retain the workstation's specified 95W cooling hardware

Intel Server Boards and Systems - SLAWQ C1 Only
✔️ Intel S3200 and S3210 Server Boards: S3210SHLX, S3210SHLC, S3200SHV, and S3200SHL support the SLAWQ C1 revision with BIOS R0039 or later; request SLAWQ for these platforms
✔️ Intel SR1530 Server Systems: SR1530SH, SR1530HSH, SR1530SHNA, and SR1530HSHNA support the SLAWQ C1 revision with BIOS R0039 or later; request SLAWQ for these systems
✔️ Intel X38ML Platform: Intel Server Board X38ML and Server System SR1520ML support the SLAWQ C1 revision with BIOS R0039 or later; request SLAWQ for this platform

☑️ Key Features

☑️ Standard 95W Core 2 Quad Q9550 with four physical processor cores and four threads
☑️ 2.83GHz base frequency with an effective 1333 MT/s front-side bus
☑️ 12MB total L2 cache arranged as two 6MB blocks
☑️ 45nm Yorkfield architecture for compatible LGA775 desktop platforms
☑️ Intel 64 and SSE4.1 instruction support for compatible operating systems and applications
☑️ Hardware virtualization, Enhanced Intel SpeedStep Technology, Execute Disable Bit, and thermal monitoring support
☑️ Interchangeable standard-Q9550 service references are clearly separated from the 65W Q9550S family
☑️ Extensive model-specific motherboard and system compatibility with minimum firmware guidance
☑️ One processor is included per quantity ordered

⚙️ Fit Notes

• This item is the standard 95W Q9550. It is not the 65W Q9550S, and it must not be installed in a system that supports only the lower-power version.
• LGA775 socket fit alone does not establish compatibility. The motherboard chipset, voltage regulator, firmware, front-side-bus capability, and cooling system must all support a 45nm 95W Q9550.
• The supplied processor can carry a C0, C1, or E0 revision depending on the interchangeable part number. Confirm the top-side sSpec when a system or motherboard support list names one exact stepping.
• Update the motherboard or system to the latest stable firmware while the currently supported processor is still installed. A system may not start far enough to perform an update after an unsupported stepping is fitted.
• Firmware versions shown in the compatibility list are minimum revisions for the listed processor support. A newer stable version is recommended when available.
• Motherboards sharing a similar retail name can use different PCB revisions, chipsets, or firmware branches. Match the complete model and PCB revision before installation.
• Confirm that the heatsink and fan assembly is rated for a 95W processor and that the fan connector, mounting hardware, and chassis airflow are correct for the system.
• Remove old thermal compound from the processor and heatsink, apply fresh thermal paste, and secure the heatsink evenly before powering on the system.
• This item includes one processor. A heatsink, fan, thermal paste, and motherboard are not included unless specifically shown or stated in the listing.