i7-1255U vs i7-5820K

Primary details

Comparing Core i7-5820K and Core i7-1255U processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1087	895
Place by popularity	not in top-100	74
Cost-effectiveness evaluation	1.19	no data
Market segment	Desktop processor	Laptop
Series	no data	Intel Alder Lake-M
Power efficiency	4.19	53.85
Architecture codename	Haswell-E (2014)	Alder Lake-U (2022)
Release date	1 September 2014 (10 years ago)	23 February 2022 (2 years ago)
Launch price (MSRP)	$410	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i7-5820K and Core i7-1255U basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.

Physical cores	6 (Hexa-Core)	10 (Deca-Core)
Threads	12	12
Base clock speed	3.3 GHz	1.7 GHz
Boost clock speed	3.6 GHz	4.7 GHz
Bus rate	0 GT/s	no data
L1 cache	64 KB (per core)	80K (per core)
L2 cache	256 KB (per core)	1.25 MB (per core)
L3 cache	15 MB (shared)	12 MB (shared)
Chip lithography	22 nm	Intel 7 nm
Die size	356 mm2	no data
Maximum core temperature	67 °C	100 °C
Number of transistors	2,600 million	no data
64 bit support	+	+
Windows 11 compatibility	-	+
Unlocked multiplier	+	-

Compatibility

Information on Core i7-5820K and Core i7-1255U compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.

Number of CPUs in a configuration	1	1
Socket	FCLGA2011	FCBGA1744
Power consumption (TDP)	140 Watt	15 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-5820K and Core i7-1255U. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.2, Intel® AVX2	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2
AES-NI	+	+
FMA	-	+
AVX	+	+
Enhanced SpeedStep (EIST)	+	+
Speed Shift	no data	+
Turbo Boost Technology	2.0	no data
Hyper-Threading Technology	+	+
TSX	+	+
Idle States	+	no data
Thermal Monitoring	+	+
Flex Memory Access	no data	+
Smart Response	+	no data
Demand Based Switching	-	no data
Deep Learning Boost	-	+

Security technologies

Core i7-5820K and Core i7-1255U technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	+
Secure Key	no data	+
Identity Protection	+	-
OS Guard	no data	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-5820K and Core i7-1255U are enumerated here.

VT-d	+	+
VT-x	+	+
EPT	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-5820K and Core i7-1255U. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4	DDR4, DDR5
Maximum memory size	64 GB	64 GB
Max memory channels	4	2
Maximum memory bandwidth	68 GB/s	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	no data	Intel® Iris® Xe Graphics eligible
Quick Sync Video	-	+
Graphics max frequency	no data	1.25 GHz
Execution Units	no data	96

Graphics interfaces

Available interfaces and connections of Core i7-5820K and Core i7-1255U integrated GPUs.

Number of displays supported

no data

4

Graphics image quality

Maximum display resolutions supported by Core i7-5820K and Core i7-1255U integrated GPUs, including resolutions over different interfaces.

Max resolution over HDMI 1.4	no data	4096 x 2304 @ 60Hz
Max resolution over eDP	no data	4096 x 2304 @ 120Hz
Max resolution over DisplayPort	no data	7680 x 4320 @ 60Hz

Graphics API support

APIs supported by Core i7-5820K and Core i7-1255U integrated GPUs, sometimes API versions are included.

DirectX	no data	12.1
OpenGL	no data	4.6

Peripherals

Specifications and connection of peripherals supported by Core i7-5820K and Core i7-1255U.

PCIe version	3.0	4.0
PCI Express lanes	28	20

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.

---

Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

---

Pros & cons summary

---

Performance score	6.20	8.53
Recency	1 September 2014	23 February 2022
Physical cores	6	10
Power consumption (TDP)	140 Watt	15 Watt

---

Should you still have questions on choice between Core i7-5820K and Core i7-1255U, ask them in Comments section, and we shall answer.

Vote for your favorite

Do you think we are right or mistaken in our choice? Vote by clicking "Like" button near your favorite CPU.

---