Xeon D-1581 vs i7-2635QM

Place in the ranking	1839	899
Place by popularity	not in top-100	not in top-100
Market segment	Laptop	Server
Series	Intel Core i7	Intel Xeon D
Power efficiency	4.58	12.17
Architecture codename	Sandy Bridge (2011−2013)	Broadwell (2015−2019)
Release date	3 January 2011 (13 years ago)	24 February 2016 (8 years ago)
Launch price (MSRP)	$378	no data

Detailed specifications

Core i7-2635QM and Xeon D-1581 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)	16 (Hexadeca-Core)
Threads	8	32
Base clock speed	2 GHz	1.8 GHz
Boost clock speed	2.9 GHz	2.4 GHz
Bus type	DMI 2.0	DMI 2.0
Bus rate	4 × 5 GT/s	no data
Multiplier	20	18
L1 cache	256 KB	1 MB
L2 cache	1 MB	4 MB
L3 cache	6 MB (shared)	24 MB
Chip lithography	32 nm	14 nm
Die size	216 mm²	306.18 mm²
Maximum core temperature	100 °C	no data
Maximum case temperature (TCase)	no data	80 °C
Number of transistors	1160 Million	4700 Million
64 bit support	+	+
Windows 11 compatibility	-	-

Compatibility

Information on Core i7-2635QM and Xeon D-1581 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	FCBGA1224	FCBGA1667
Power consumption (TDP)	45 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i7-2635QM and Xeon D-1581. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® AVX	Intel® AVX2
AES-NI	+	+
FMA	+	-
AVX	+	+
Enhanced SpeedStep (EIST)	+	+
My WiFi	+	no data
Turbo Boost Technology	2.0	2.0
Hyper-Threading Technology	+	+
TSX	-	+
Idle States	+	+
Thermal Monitoring	+	+
Flex Memory Access	+	no data
Demand Based Switching	-	no data
GPIO	no data	+
FDI	+	no data
Fast Memory Access	+	no data

Security technologies

Core i7-2635QM and Xeon D-1581 technologies aimed at improving security, for example, by protecting against hacks.

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

Virtualization technologies

Virtual machine speed-up technologies supported by Core i7-2635QM and Xeon D-1581 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i7-2635QM and Xeon D-1581. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3-1066, DDR3-1333	DDR4, DDR3
Maximum memory size	16 GB	128 GB
Max memory channels	2	2
Maximum memory bandwidth	21.335 GB/s	34.124 GB/s
ECC memory support	-	+

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel HD Graphics 3000	no data
Quick Sync Video	+	-
Clear Video HD	+	no data
Graphics max frequency	1.2 GHz	no data
InTru 3D	+	no data

Graphics interfaces

Available interfaces and connections of Core i7-2635QM and Xeon D-1581 integrated GPUs.

Number of displays supported	2	no data
eDP	+	no data
DisplayPort	+	-
HDMI	+	-
SDVO	+	no data
CRT	+	no data

Peripherals

Specifications and connection of peripherals supported by Core i7-2635QM and Xeon D-1581.

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

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.

i7-2635QM 2.22

Xeon D-1581 8.52
+284%

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.

i7-2635QM 3459

Xeon D-1581 13282
+284%

Gaming performance

Pros & cons summary

Performance score	2.22	8.52
Recency	3 January 2011	24 February 2016
Physical cores	4	16
Threads	8	32
Chip lithography	32 nm	14 nm
Power consumption (TDP)	45 Watt	65 Watt

i7-2635QM has 44.4% lower power consumption.

Xeon D-1581, on the other hand, has a 283.8% higher aggregate performance score, an age advantage of 5 years, 300% more physical cores and 300% more threads, and a 128.6% more advanced lithography process.

The Xeon D-1581 is our recommended choice as it beats the Core i7-2635QM in performance tests.

Be aware that Core i7-2635QM is a notebook processor while Xeon D-1581 is a server/workstation one.

Should you still have questions on choice between Core i7-2635QM and Xeon D-1581, ask them in Comments section, and we shall answer.