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Intel Core 2 Extreme QX9775 EU80574XL088N (BX80574QX9775 / BX80574QX9775A)

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Core 2 Extreme QX9775 microprocessor, part of "Skulltrail" platform, was launched in February 2008. "Skulltrail", that also included desktop D5400XS motherboard, was demonstrated numerous times before the official launch, and was positioned as a gaming and digital media platform. The platform was unique in a sense that it took "Extreme" from the family name to the extreme. While frequency and features of the QX9775 processor were not different from the QX9770, the QX9775 supported dual CPU configuration. Being the socket 771 CPU, the QX9775 couldn't work in consumer socket 775 motherboards, and required quite expensive dual-socket D5400XS board. The board also accepted up to four PCI Express graphics cards, either NVIDIA SLI or ATI CrossFireX, and supported up to 8 GB FBDIMM 800 memory. Although the board had sockets 771, it used socket 775 heatsinks. The price for this platform was also "extreme". Each QX9775 processor had suggested retail price $1499, and the price of the D5400XS board was $600+, so the total just for two CPUs with the board would be more than $3600.

The QX9775 platform outperformed QX9770 by large margin in multi-threaded digital media applications, but it didn't always have the best performance in games owing to their poor utilization of multiple cores. Compared with the QX9770, the platform had noticeable performance advantage in some games, while not showing any performance difference in other games, or, in some cases, showing worse performance due to lower memory bandwidth than the memory bandwidth available on QX9770 consumer boards with DDR3 memory.

Intel Core 2 Extreme QX9775 specifications

General information
TypeCPU / Microprocessor
Market segmentDesktop
FamilyIntel Core 2 Extreme
Model number  ? QX9775
CPU part numbers
  • EU80574XL088N is an OEM/tray microprocessor
  • BX80574QX9775 is a boxed microprocessor
  • BX80574QX9775A is a boxed microprocessor
  • BX80574QX9775P is a boxed microprocessor
Frequency  ? 3200 MHz
Bus speed  ? 1600 MHz
Clock multiplier  ? 8
Package771-land Flip-Chip Land Grid Array (FC-LGA8)
1.48" x 1.48" (3.75 cm x 3.75 cm)
SocketSocket 771 / LGA771
Introduction dateFebruary 19, 2008
Price at introduction$1499
S-spec numbers
  Production processors
Part number SLANY
Architecture / Microarchitecture
Processor core  ? Yorkfield
Core stepping  ? C0 (SLANY)
Manufacturing process0.045 micron
820 million transistors
Die size214mm2
Data width64 bit
The number of cores4
The number of threads4
Floating Point UnitIntegrated
Level 1 cache size  ? 4 x 32 KB 8-way set associative instruction caches
4 x 32 KB 8-way set associative data caches
Level 2 cache size  ? 2 x 6 MB 24-way set associative caches (each L2 cache is shared between 2 cores)
MultiprocessingUp to 2 processors
  • MMX instructions
  • SSE / Streaming SIMD Extensions
  • SSE2 / Streaming SIMD Extensions 2
  • SSE3 / Streaming SIMD Extensions 3
  • SSSE3 / Supplemental Streaming SIMD Extensions 3
  • EM64T / Extended Memory 64 technology / Intel 64  ? 
  • VT / Virtualization technology  ? 
  • NX / XD / Execute disable bit  ? 
  • SSE4.1 / Streaming SIMD Extensions 4.1  ? 
Low power features
  • Enhanced SpeedStep technology  ? 
  • Stop Grant state  ? 
  • Halt state
  • Extended Halt state
Integrated peripherals / components
Integrated graphicsNone
Electrical / Thermal parameters
V core  ? 0.85V - 1.35V
Minimum/Maximum operating temperature  ? 5°C - 63°C
Thermal Design Power  ? 150 Watt
Notes on Intel Core 2 Extreme QX9775
  • Binary compatible with 32-bit x86 software
  • Bus frequency is 400 MHz. Because the processor uses Quad Data Rate bus the effective bus speed is 1600 MHz

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Detailed side-by-side comparison

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Historical price chart

The chart below shows official prices of Intel Core 2 Extreme QX9650, QX9770 and QX9775 processors:

Historical official prices of Core 2 Extreme QX9650, QX9770 and QX9775 processors


Q: Can I upgrade my QX9775 microprocessor?
A: Probably yes. Processor compatibility is determined by your motherboard. Please see resource for CPU support list for your board.

Core 2 Extreme QX9775 Overclocking

Sorry, overclocking information is not available at this time.

CPU ID information for the Core 2 Extreme QX9775

We don't have CPU ID information for the Intel Core 2 Extreme QX9775 CPU in our database. If you have this processor please use our CPUID tool to submit CPUID information. During submission, please specify family name, EU80574XL088N part number, and, most importantly, make the CPUID record public. To search or browse all public CPUID submissions please visit CPUID database.

CPUs, related to Intel Core 2 Extreme QX9775

Model Cores /
Frequency L2
TDP Features  
Intel Core 2 Extreme family, Socket 771
   Core 2 Extreme QX97754 / 43.2 GHz12 MB2150W 
Intel Core 2 Extreme family, Core micro-architecture, Other sockets
   Core 2 Extreme X68002 / 22.93 GHz4 MB175W>
   Core 2 Extreme QX67004 / 42.66 GHz8 MB1130W>
   Core 2 Extreme QX68004 / 42.93 GHz8 MB1130W>
   Core 2 Extreme QX68504 / 43 GHz8 MB1130W>
   Core 2 Extreme QX96504 / 43 GHz12 MB1130W>
   Core 2 Extreme QX97704 / 43.2 GHz12 MB1136W>
Other families, Core micro-architecture, Socket 771
   Celeron 4451 / 11.86 GHz512 KB 65W>
   Core 2 Duo E63052 / 21.86 GHz2 MB165W>
   Core 2 Duo E64052 / 22.13 GHz2 MB165W>
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