Xeon 656 vs Celeron U3405

Primary details

Comparing processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	3452	not rated
Place by popularity	not in top-100	not in top-100
Market segment	Laptop	Server
Series	Intel Celeron	no data
Power efficiency	0.59	no data
Designer	Intel	Intel
Manufacturer	no data	Intel
Architecture codename	Westmere (2010−2011)	Granite Rapids (2024−2026)
Release date	no data	2 February 2026 (less than a year ago)
Launch price (MSRP)	no data	$1,399

Detailed specifications

Celeron U3405 and Xeon 656 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)	20 (Icosa-Core)
Performance-cores	no data	20
Threads	2	40
Base clock speed	1.06 GHz	2.9 GHz
Boost clock speed	0.07 GHz	4.8 GHz
Bus type	DMI 1.0	no data
Bus rate	1 × 2.5 GT/s	0 GT/s
Multiplier	8	no data
L1 cache	128 KB	112 KB (per core)
L2 cache	512 KB	2 MB (per core)
L3 cache	2 MB	72 MB (shared)
Chip lithography	32 nm	Intel 3 nm
Die size	81 mm2	2x 598 mm2
Maximum core temperature	90 °C	no data
Maximum case temperature (TCase)	no data	74 °C
Number of transistors	382 Million	no data
64 bit support	+	+
Windows 11 compatibility	-	no data
Unlocked multiplier	-	+

Compatibility

Information on Celeron U3405 and Xeon 656 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
Socket	BGA1288	FCLGA4710
Power consumption (TDP)	18 Watt	210 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Celeron U3405 and Xeon 656. You'll probably need this information if you require some particular technology.

Instruction set extensions	no data	Intel® SSE4.1, Intel® AMX, Intel® SSE4.2, Intel® AVX2, Intel® AVX-512
AES-NI	-	+
FMA	+	-
AVX	-	+
vPro	no data	+
Enhanced SpeedStep (EIST)	+	+
Speed Shift	no data	+
Turbo Boost Technology	-	2.0
Hyper-Threading Technology	-	+
TSX	-	+
Idle States	+	no data
Thermal Monitoring	+	-
Flex Memory Access	+	no data
PAE	36 Bit	no data
Turbo Boost Max 3.0	no data	+
FDI	+	no data
Fast Memory Access	+	no data
Deep Learning Boost	-	+

Security technologies

Celeron U3405 and Xeon 656 technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	+
EDB	+	+
SGX	no data	-
OS Guard	no data	+

Virtualization technologies

Virtual machine speed-up technologies supported by Celeron U3405 and Xeon 656 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Celeron U3405 and Xeon 656. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3-800, DDR3-1066	DDR5(6400MT/s)
Maximum memory size	8 GB	4 TB
Max memory channels	2	8
Maximum memory bandwidth	17.051 GB/s	no data
ECC memory support	+	+

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel HD Graphics for Previous Generation Intel Processors	N/A
Clear Video	+	no data
Graphics max frequency	500 MHz	no data

Graphics interfaces

Available interfaces and connections of Celeron U3405 and Xeon 656 integrated GPUs.

Number of displays supported

2

no data

Peripherals

Specifications and connection of peripherals supported by Celeron U3405 and Xeon 656.

PCIe version	2.0	5.0
PCI Express lanes	16	128

Pros & cons summary

---

Physical cores	2	20
Threads	2	40
Power consumption (TDP)	18 Watt	210 Watt