i7-840QM vs Xeon D-1521

Primary details

Comparing Xeon D-1521 and Core i7-840QM processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1484	2285
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	2.47	no data
Market segment	Server	Laptop
Series	Intel Xeon D	Intel Core i7
Power efficiency	7.54	2.57
Architecture codename	Broadwell (2015−2019)	Clarksfield (2009−2010)
Release date	1 November 2015 (8 years ago)	20 June 2010 (14 years ago)
Launch price (MSRP)	$199	$568

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Xeon D-1521 and Core i7-840QM 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)	4 (Quad-Core)
Threads	8	8
Base clock speed	2.4 GHz	1.86 GHz
Boost clock speed	2.7 GHz	3.2 GHz
Bus type	DMI 2.0	DMI 1.0
Bus rate	no data	2.5 GT/s
Multiplier	24	14
L1 cache	256 KB	64 KB (per core)
L2 cache	1 MB	256 KB (per core)
L3 cache	6 MB	8 MB (shared)
Chip lithography	14 nm	45 nm
Die size	246.24 mm2	296 mm2
Maximum core temperature	no data	100 °C
Maximum case temperature (TCase)	80 °C	no data
Number of transistors	3200 Million	774 million
64 bit support	+	+
Windows 11 compatibility	-	-

Compatibility

Information on Xeon D-1521 and Core i7-840QM 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	FCPGA988,PGA988
Power consumption (TDP)	45 Watt	45 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon D-1521 and Core i7-840QM. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® AVX2	Intel® SSE4.2
AES-NI	+	-
AVX	+	-
vPro	no data	+
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	2.0	+
Hyper-Threading Technology	+	+
TSX	+	-
Idle States	+	+
Thermal Monitoring	+	+
PAE	no data	36 Bit
GPIO	+	no data
Status	Launched	Discontinued

Security technologies

Xeon D-1521 and Core i7-840QM technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	+
Secure Key	+	no data
OS Guard	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon D-1521 and Core i7-840QM are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon D-1521 and Core i7-840QM. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4, DDR3	DDR3
Maximum memory size	128 GB	8 GB
Max memory channels	2	2
Maximum memory bandwidth	34.124 GB/s	21.335 GB/s
ECC memory support	+	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

no data

None

Peripherals

Specifications and connection of peripherals supported by Xeon D-1521 and Core i7-840QM.

PCIe version	2.0/3.0	2
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.

Pros & cons summary

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Performance score	3.73	1.27
Recency	1 November 2015	20 June 2010
Chip lithography	14 nm	45 nm

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Should you still have questions on choice between Xeon D-1521 and Core i7-840QM, ask them in Comments section, and we shall answer.

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