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Core i7-7740X - Intel
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Core i7-7740X
kaby lake x (front).png
General Info
Model Numberi7-7740X
Part NumberBX80677I77740X, BXC80677I77740X
IntroductionMay 30, 2017 (announced)
June 26, 2017 (launched)
Release Price$339
General Specs
FamilyCore i7
Frequency4,300 MHz
Turbo Frequency4,500 MHz (1 core),
4,500 MHz (2 cores),
4,500 MHz (3 cores),
4,500 MHz (4 cores)
Bus typeDMI 3.0
Bus rate4 × 8 GT/s
ISAx86-64 (x86)
MicroarchitectureKaby Lake
PlatformKaby Lake
Core NameKaby Lake X
Core Family6
Core Model158
Core SteppingB0
Process14 nm
Word Size64 bit
Max CPUs1 (Uniprocessor)
Max Memory64 GiB
TDP112 W
Tstorage-25 °C – 125 °C
PackageFCLGA-2066 (LGA)
Dimension52.5 mm x 45 mm
Pitch1.016 mm
SocketSocket R4

Core i7-7740X is a 64-bit quad-core high-end performance x86 desktop microprocessor introduced by Intel in 2017. This processor, which is based on the Kaby Lake microarchitecture, is manufactured on Intel's improved 14nm+ process. The i7-7740X operates at 4.3 GHz with a TDP of 112 W and a Turbo Boost frequency of 4.5 GHz for all cores. This MPU supports up to 64 GiB of dual-channel DDR4-2666 memory.


Main article: Kaby Lake § Cache

[Edit/Modify Cache Info]

hierarchy icon.svg
Cache Organization
Cache is a hardware component containing a relatively small and extremely fast memory designed to speed up the performance of a CPU by preparing ahead of time the data it needs to read from a relatively slower medium such as main memory.

The organization and amount of cache can have a large impact on the performance, power consumption, die size, and consequently cost of the IC.

Cache is specified by its size, number of sets, associativity, block size, sub-block size, and fetch and write-back policies.

Note: All units are in kibibytes and mebibytes.
L1$256 KiB
0.25 MiB
262,144 B
2.441406e-4 GiB
L1I$128 KiB
0.125 MiB
131,072 B
1.220703e-4 GiB
4x32 KiB8-way set associative 
L1D$128 KiB
0.125 MiB
131,072 B
1.220703e-4 GiB
4x32 KiB8-way set associativewrite-back

L2$1 MiB
1,024 KiB
1,048,576 B
9.765625e-4 GiB
  4x256 KiB4-way set associativewrite-back

L3$8 MiB
8,192 KiB
8,388,608 B
0.00781 GiB
  4x2 MiB write-back

Memory controller[edit]

[Edit/Modify Memory Info]

ram icons.svg
Integrated Memory Controller
Max TypeDDR4-2666
Supports ECCNo
Max Mem64 GiB
Max Bandwidth39.74 GiB/s
Single 19.87 GiB/s
Double 39.74 GiB/s


[Edit/Modify Expansions Info]

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Expansion Options
Max Lanes16
Configs1x16, 2x8, 1x8+2x4


This processor has no integrated graphics.


[Edit/Modify Supported Features]

Supported x86 Extensions & Processor Features
MMXMMX Extension
EMMXExtended MMX Extension
SSEStreaming SIMD Extensions
SSE2Streaming SIMD Extensions 2
SSE3Streaming SIMD Extensions 3
SSSE3Supplemental SSE3
SSE4.1Streaming SIMD Extensions 4.1
SSE4.2Streaming SIMD Extensions 4.2
AVXAdvanced Vector Extensions
AVX2Advanced Vector Extensions 2
ABMAdvanced Bit Manipulation
BMI1Bit Manipulation Instruction Set 1
BMI2Bit Manipulation Instruction Set 2
FMA33-Operand Fused-Multiply-Add
AESAES Encryption Instructions
RdRandHardware RNG
ADXMulti-Precision Add-Carry
CLMULCarry-less Multiplication Extension
F16C16-bit Floating Point Conversion
x86-1616-bit x86
x86-3232-bit x86
x86-6464-bit x86
RealReal Mode
ProtectedProtected Mode
SMMSystem Management Mode
FPUIntegrated x87 FPU
TBT 2.0Turbo Boost Technology 2.0
EISTEnhanced SpeedStep Technology
VT-xVT-x (Virtualization)
VT-dVT-d (I/O MMU virtualization)
EPTExtended Page Tables (SLAT)
TSXTransactional Synchronization Extensions
MPXMemory Protection Extensions
SGXSoftware Guard Extensions


See also: Intel's CPU Frequency Behavior

[Modify Frequency Info]

ModeBaseTurbo Frequency/Active Cores
Normal4,300 MHz4,500 MHz4,500 MHz4,500 MHz4,500 MHz
Facts about "Core i7-7740X - Intel"
Has subobject
"Has subobject" is a predefined property representing a container construct and is provided by Semantic MediaWiki.
Core i7-7740X - Intel#package +
base frequency4,300 MHz (4.3 GHz, 4,300,000 kHz) +
bus links4 +
bus rate8,000 MT/s (8 GT/s, 8,000,000 kT/s) +
bus typeDMI 3.0 +
chipsetLewisburg +
core count4 +
core family6 +
core model158 +
core nameKaby Lake X +
core steppingB0 +
designerIntel +
familyCore i7 +
first announcedMay 30, 2017 +
first launchedJune 26, 2017 +
full page nameintel/core i7/i7-7740x +
has advanced vector extensionstrue +
has advanced vector extensions 2true +
has ecc memory supportfalse +
has extended page tables supporttrue +
has featureAdvanced Vector Extensions +, Advanced Vector Extensions 2 +, Advanced Encryption Standard Instruction Set Extension +, Hyper-Threading Technology +, Turbo Boost Technology 2.0 +, Enhanced SpeedStep Technology +, Intel VT-x +, Intel VT-d + and Transactional Synchronization Extensions +
has intel enhanced speedstep technologytrue +
has intel turbo boost technology 2 0true +
has intel vt-d technologytrue +
has intel vt-x technologytrue +
has locked clock multiplierfalse +
has second level address translation supporttrue +
has simultaneous multithreadingtrue +
has transactional synchronization extensionstrue +
has x86 advanced encryption standard instruction set extensiontrue +
instance ofmicroprocessor +
isax86-64 +
isa familyx86 +
l1$ size0.25 MiB (256 KiB, 262,144 B, 2.441406e-4 GiB) +
l1d$ description8-way set associative +
l1d$ size0.125 MiB (128 KiB, 131,072 B, 1.220703e-4 GiB) +
l1i$ description8-way set associative +
l1i$ size0.125 MiB (128 KiB, 131,072 B, 1.220703e-4 GiB) +
l2$ description4-way set associative +
l2$ size1 MiB (1,024 KiB, 1,048,576 B, 9.765625e-4 GiB) +
l3$ size8 MiB (8,192 KiB, 8,388,608 B, 0.00781 GiB) +
ldateJune 26, 2017 +
main imageFile:kaby lake x (front).png +
manufacturerIntel +
market segmentDesktop +
max cpu count1 +
max memory65,536 MiB (67,108,864 KiB, 68,719,476,736 B, 64 GiB, 0.0625 TiB) +
max pcie lanes16 +
max storage temperature398.15 K (125 °C, 257 °F, 716.67 °R) +
microarchitectureKaby Lake +
min storage temperature248.15 K (-25 °C, -13 °F, 446.67 °R) +
model numberi7-7740X +
nameCore i7-7740X +
packageFCLGA-2066 +
part numberBX80677I77740X + and BXC80677I77740X +
platformKaby Lake +
process14 nm (0.014 μm, 1.4e-5 mm) +
release price$ 339.00 (€ 305.10, £ 274.59, ¥ 35,028.87) +
s-specSR3FP +
seriesi7-7700 +
socketSocket R4 +
supported memory typeDDR4-2666 +
tdp112 W (112,000 mW, 0.15 hp, 0.112 kW) +
technologyCMOS +
thread count8 +
turbo frequency (1 core)4,500 MHz (4.5 GHz, 4,500,000 kHz) +
turbo frequency (2 cores)4,500 MHz (4.5 GHz, 4,500,000 kHz) +
turbo frequency (3 cores)4,500 MHz (4.5 GHz, 4,500,000 kHz) +
turbo frequency (4 cores)4,500 MHz (4.5 GHz, 4,500,000 kHz) +
word size64 bit (8 octets, 16 nibbles) +