i7-4578U vs i7-5557U

Primary details

Comparing Core i7-5557U and Core i7-4578U processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1952	1951
Place by popularity	not in top-100	not in top-100
Market segment	Laptop	Laptop
Series	Intel Core i7	Intel Core i7
Power efficiency	6.62	6.62
Architecture codename	Broadwell-U (2015)	Haswell (2013−2015)
Release date	1 March 2015 (9 years ago)	21 July 2014 (10 years ago)
Launch price (MSRP)	$426	$426

Detailed specifications

Core i7-5557U and Core i7-4578U 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	2 (Dual-core)	2 (Dual-core)
Threads	4	4
Base clock speed	3.1 GHz	3 GHz
Boost clock speed	3.4 GHz	3.5 GHz
Bus rate	5 GT/s	5 GT/s
L1 cache	64K (per core)	128 KB
L2 cache	256K (per core)	512 KB
L3 cache	4 MB (shared)	4 MB
Chip lithography	14 nm	22 nm
Die size	133 mm2	181 mm2
Maximum core temperature	105 °C	100 °C
Maximum case temperature (TCase)	105 °C	no data
Number of transistors	1900 Million	1300 Million
64 bit support	+	+
Windows 11 compatibility	-	-

Compatibility

Information on Core i7-5557U and Core i7-4578U 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	FCBGA1168	FCBGA1168
Power consumption (TDP)	28 Watt	28 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-5557U and Core i7-4578U. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2
AES-NI	+	+
AVX	+	+
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	2.0	2.0
Hyper-Threading Technology	+	+
Idle States	+	+
Thermal Monitoring	+	+
Flex Memory Access	+	no data
Smart Response	+	no data
FDI	+	+
Fast Memory Access	+	no data

Security technologies

Core i7-5557U and Core i7-4578U technologies aimed at improving security, for example, by protecting against hacks.

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

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-5557U and Core i7-4578U are enumerated here.

AMD-V	+	+
VT-d	+	+
VT-x	+	+
EPT	+	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-5557U and Core i7-4578U. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR3
Maximum memory size	16 GB	16 GB
Max memory channels	2	2
Maximum memory bandwidth	25.6 GB/s	25.6 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card Compare	Intel Iris Graphics 6100	Intel Iris Graphics 5100
Max video memory	16 GB	2 GB
Quick Sync Video	+	+
Clear Video	+	no data
Clear Video HD	+	+
Graphics max frequency	1.1 GHz	1.2 GHz
InTru 3D	+	+

Graphics interfaces

Available interfaces and connections of Core i7-5557U and Core i7-4578U integrated GPUs.

Number of displays supported	3	3
eDP	+	+
DisplayPort	+	+
HDMI	+	+
VGA	no data	+

Graphics image quality

Maximum display resolutions supported by Core i7-5557U and Core i7-4578U integrated GPUs, including resolutions over different interfaces.

Max resolution over HDMI 1.4	2560x1600@60Hz	3200x2000@60Hz
Max resolution over DisplayPort	3840x2160@60Hz	3200x2000@60Hz
Max resolution over VGA	no data	N/A

Graphics API support

APIs supported by Core i7-5557U and Core i7-4578U integrated GPUs, sometimes API versions are included.

DirectX	11.2/12	11.2/12
OpenGL	4.3	4.3

Peripherals

Specifications and connection of peripherals supported by Core i7-5557U and Core i7-4578U.

PCIe version	2.0	2
PCI Express lanes	12	12

Synthetic benchmark performance

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

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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.

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Pros & cons summary

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Integrated graphics card	2.34	1.94
Recency	1 March 2015	21 July 2014
Chip lithography	14 nm	22 nm

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Should you still have questions on choice between Core i7-5557U and Core i7-4578U, ask them in Comments section, and we shall answer.

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