Core i7-820QM vs Xeon E5640

Primary details

Comparing Xeon E5640 and Core i7-820QM processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	1698	2288
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.85	no data
Market segment	Server	Laptop
Series	no data	Intel Core i7
Architecture codename	Westmere-EP (2010−2011)	Clarksfield (2009−2010)
Release date	16 March 2010 (14 years ago)	23 September 2009 (14 years ago)
Launch price (MSRP)	$49	$546
Current price	$68 (1.4x MSRP)	$529 (1x MSRP)

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Xeon E5640 and Core i7-820QM 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	2.66 GHz	1.73 GHz
Boost clock speed	2.93 GHz	3.06 GHz
Bus support	no data	2500 MHz
L1 cache	64 KB (per core)	64 KB (per core)
L2 cache	256 KB (per core)	256 KB (per core)
L3 cache	12 MB (shared)	8 MB (shared)
Chip lithography	32 nm	45 nm
Die size	239 mm2	296 mm2
Maximum core temperature	78 °C	100 °C
Number of transistors	1,170 million	774 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	No	No

Compatibility

Information on Xeon E5640 and Core i7-820QM 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	2	1
Socket	FCLGA1366,LGA1366	FCPGA988,PGA988
Power consumption (TDP)	80 Watt	45 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon E5640 and Core i7-820QM. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.2	Intel® SSE4.2
AES-NI	+	-
vPro	no data	+
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	1.0	1.0
Hyper-Threading Technology	+	+
Idle States	+	+
Thermal Monitoring	-	+
Demand Based Switching	+	no data
PAE	40 Bit	36 Bit
Status	Discontinued	Discontinued

Security technologies

Xeon E5640 and Core i7-820QM technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon E5640 and Core i7-820QM are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon E5640 and Core i7-820QM. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR3-1066, DDR3-1333
Maximum memory size	288 GB	8 GB
Max memory channels	3	2
Maximum memory bandwidth	25.6 GB/s	21 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 E5640 and Core i7-820QM.

PCIe version	2.0	2
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.

Xeon E5640 outperforms Core i7-820QM by 108% based on our aggregate benchmark results.

---

Pros & cons summary

---

Performance score	2.39	1.15
Recency	16 March 2010	23 September 2009
Cost	$49	$546
Chip lithography	32 nm	45 nm
Power consumption (TDP)	80 Watt	45 Watt

---

Should you still have questions on choice between Xeon E5640 and Core i7-820QM, ask them in Comments section, and we shall answer.

Vote for your favorite

Do you think we are right or mistaken in our choice? Vote by clicking "Like" button near your favorite CPU.

---