Celeron 3865U vs Xeon D-1521

Primary details

Comparing Xeon D-1521 and Celeron 3865U processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1503	2576
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	2.46	no data
Market segment	Server	Laptop
Series	Intel Xeon D	Intel Celeron
Power efficiency	7.54	5.23
Architecture codename	Broadwell (2015−2019)	Kaby Lake-U (2017)
Release date	1 November 2015 (9 years ago)	3 January 2017 (7 years ago)
Launch price (MSRP)	$199	$107

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Xeon D-1521 and Celeron 3865U 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	4 (Quad-Core)	2 (Dual-core)
Threads	8	2
Base clock speed	2.4 GHz	1.8 GHz
Boost clock speed	2.7 GHz	1.8 GHz
Bus type	DMI 2.0	OPI
Bus rate	no data	4 GT/s
Multiplier	24	22
L1 cache	256 KB	128 KB
L2 cache	1 MB	512 KB
L3 cache	6 MB	2 MB (shared)
Chip lithography	14 nm	14 nm
Die size	246.24 mm2	98.7 mm2
Maximum core temperature	no data	100 °C
Maximum case temperature (TCase)	80 °C	no data
Number of transistors	3200 Million	no data
64 bit support	+	+
Windows 11 compatibility	-	-

Compatibility

Information on Xeon D-1521 and Celeron 3865U 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 (Uniprocessor)	1 (Uniprocessor)
Socket	FCBGA1667	FCBGA1356,FPBGA1356
Power consumption (TDP)	45 Watt	15 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon D-1521 and Celeron 3865U. You'll probably need this information if you require some particular technology.

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

Security technologies

Xeon D-1521 and Celeron 3865U technologies aimed at improving security, for example, by protecting against hacks.

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

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon D-1521 and Celeron 3865U are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon D-1521 and Celeron 3865U. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4, DDR3	DDR3, DDR4
Maximum memory size	128 GB	32 GB
Max memory channels	2	2
Maximum memory bandwidth	34.124 GB/s	34.134 GB/s
ECC memory support	+	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	no data	Intel HD Graphics 610
Max video memory	no data	32 GB
Quick Sync Video	-	+
Clear Video	no data	+
Clear Video HD	no data	+
Graphics max frequency	no data	900 MHz

Graphics interfaces

Available interfaces and connections of Xeon D-1521 and Celeron 3865U 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 Xeon D-1521 and Celeron 3865U integrated GPUs, including resolutions over different interfaces.

4K resolution support	no data	+
Max resolution over HDMI 1.4	no data	4096x2304@24Hz
Max resolution over eDP	no data	4096x2304@60Hz
Max resolution over DisplayPort	no data	4096x2304@60Hz

Graphics API support

APIs supported by Xeon D-1521 and Celeron 3865U integrated GPUs, sometimes API versions are included.

DirectX	no data	12
OpenGL	no data	4.4

Peripherals

Specifications and connection of peripherals supported by Xeon D-1521 and Celeron 3865U.

PCIe version	2.0/3.0	2.0
PCI Express lanes	24	16
USB revision	2.0/3.0	no data
Total number of SATA ports	6	no data
Number of USB ports	8	no data
Integrated LAN	+	no data
UART	+	no data

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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Performance score	3.72	0.86
Recency	1 November 2015	3 January 2017
Physical cores	4	2
Threads	8	2
Power consumption (TDP)	45 Watt	15 Watt

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Should you still have questions on choice between Xeon D-1521 and Celeron 3865U, ask them in Comments section, and we shall answer.

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