i5-8257U vs Celeron 420

Place in the ranking	3323	1281
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Laptop
Series	no data	Intel Core i5
Power efficiency	0.40	29.50
Architecture codename	Conroe-L (2007−2008)	Coffee Lake-U (2018−2019)
Release date	June 2007 (17 years ago)	10 July 2019 (5 years ago)
Launch price (MSRP)	$23	no data

Detailed specifications

Celeron 420 and Core i5-8257U 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	1 (Single-Core)	4 (Quad-Core)
Threads	1	8
Base clock speed	1.6 GHz	1.4 GHz
Boost clock speed	1.6 GHz	3.9 GHz
Bus rate	no data	4 GT/s
L1 cache	64 KB	256 KB
L2 cache	512 KB	1 MB
L3 cache	0 KB	6 MB
Chip lithography	65 nm	14 nm
Die size	77 mm²	no data
Maximum core temperature	no data	100 °C
Maximum case temperature (TCase)	60 °C	no data
Number of transistors	105 million	no data
64 bit support	+	+
Windows 11 compatibility	-	+
VID voltage range	1V-1.3375V	no data

Compatibility

Information on Celeron 420 and Core i5-8257U 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	LGA775	FCBGA1528
Power consumption (TDP)	35 Watt	15 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Celeron 420 and Core i5-8257U. You'll probably need this information if you require some particular technology.

Instruction set extensions	no data	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2
AES-NI	-	+
AVX	-	+
Enhanced SpeedStep (EIST)	-	+
eDRAM	no data	128 MB
Speed Shift	no data	+
My WiFi	no data	+
Turbo Boost Technology	-	2.0
Hyper-Threading Technology	-	+
Idle States	+	+
Thermal Monitoring	+	+
Flex Memory Access	no data	+
Demand Based Switching	-	no data
FSB parity	-	no data

Security technologies

Celeron 420 and Core i5-8257U technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	-
EDB	+	+
Secure Key	no data	+
MPX	-	+
Identity Protection	-	+
SGX	no data	Yes with Intel® ME
OS Guard	no data	+

Virtualization technologies

Virtual machine speed-up technologies supported by Celeron 420 and Core i5-8257U are enumerated here.

AMD-V	-	+
VT-d	-	+
VT-x	-	+
EPT	no data	+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Celeron 420 and Core i5-8257U. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR1, DDR2, DDR3	DDR4
Maximum memory size	no data	32 GB
Max memory channels	no data	2
Maximum memory bandwidth	no data	37.5 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	no data	Intel Iris Plus Graphics 645
Max video memory	no data	32 GB
Quick Sync Video	-	+
Clear Video	no data	+
Clear Video HD	no data	+
Graphics max frequency	no data	1.05 GHz
InTru 3D	no data	+

Graphics interfaces

Available interfaces and connections of Celeron 420 and Core i5-8257U integrated GPUs.

Number of displays supported	no data	3
eDP	no data	+
DisplayPort	-	+
HDMI	-	+
DVI	no data	+

Graphics image quality

Maximum display resolutions supported by Celeron 420 and Core i5-8257U integrated GPUs, including resolutions over different interfaces.

4K resolution support	no data	+
Max resolution over HDMI 1.4	no data	4096x2304@30Hz
Max resolution over eDP	no data	4096x2304@60Hz
Max resolution over DisplayPort	no data	4096x2304@60Hz

Graphics API support

APIs supported by Celeron 420 and Core i5-8257U integrated GPUs, sometimes API versions are included.

DirectX	no data	12
OpenGL	no data	4.5

Peripherals

Specifications and connection of peripherals supported by Celeron 420 and Core i5-8257U.

PCIe version	no data	3.0
PCI Express lanes	no data	16

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.

Celeron 420 0.15

i5-8257U 4.70
+3033%

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

Celeron 420 235

i5-8257U 7463
+3076%

Gaming performance

Pros & cons summary

Performance score	0.15	4.70
Physical cores	1	4
Threads	1	8
Chip lithography	65 nm	14 nm
Power consumption (TDP)	35 Watt	15 Watt

i5-8257U has a 3033.3% higher aggregate performance score, 300% more physical cores and 700% more threads, a 364.3% more advanced lithography process, and 133.3% lower power consumption.

The Core i5-8257U is our recommended choice as it beats the Celeron 420 in performance tests.

Note that Celeron 420 is a desktop processor while Core i5-8257U is a notebook one.

Should you still have questions on choice between Celeron 420 and Core i5-8257U, ask them in Comments section, and we shall answer.