Xeon E5606 vs i5-661

Primary details

Comparing Core i5-661 and Xeon E5606 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	2110	2146
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.08	0.43
Market segment	Desktop processor	Server
Power efficiency	1.69	1.76
Architecture codename	Clarkdale (2010−2011)	Westmere-EP (2010−2011)
Release date	7 January 2010 (14 years ago)	14 February 2011 (13 years ago)
Launch price (MSRP)	$252	$46

Cost-effectiveness evaluation

Performance per price, higher is better.

Xeon E5606 has 438% better value for money than i5-661.

Detailed specifications

Core i5-661 and Xeon E5606 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)	4 (Quad-Core)
Threads	4	4
Base clock speed	3.33 GHz	2.13 GHz
Boost clock speed	3.6 GHz	0.13 GHz
Bus rate	2.5 GT/s	no data
L1 cache	64 KB (per core)	64 KB (per core)
L2 cache	256 KB (per core)	256 KB (per core)
L3 cache	4 MB (shared)	8 MB (shared)
Chip lithography	32 nm	32 nm
Die size	81 mm2	239 mm2
Maximum core temperature	70 °C	no data
Number of transistors	382 million	1,170 million
64 bit support	+	+
Windows 11 compatibility	-	-

Compatibility

Information on Core i5-661 and Xeon E5606 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	2
Socket	FCLGA1156	FCLGA1366,LGA1366
Power consumption (TDP)	87 Watt	80 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i5-661 and Xeon E5606. You'll probably need this information if you require some particular technology.

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

Security technologies

Core i5-661 and Xeon E5606 technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core i5-661 and Xeon E5606 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i5-661 and Xeon E5606. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR3
Maximum memory size	16.38 GB	288 GB
Max memory channels	2	3
Maximum memory bandwidth	21 GB/s	25.6 GB/s
ECC memory support	-	+

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel® HD Graphics for Previous Generation Intel® Processors	no data
Clear Video HD	+	no data

Graphics interfaces

Available interfaces and connections of Core i5-661 and Xeon E5606 integrated GPUs.

Number of displays supported

2

no data

Peripherals

Specifications and connection of peripherals supported by Core i5-661 and Xeon E5606.

PCIe version	2.0	2.0
PCI Express lanes	16	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.

---

Pros & cons summary

---

Performance score	1.56	1.49
Recency	7 January 2010	14 February 2011
Physical cores	2	4
Power consumption (TDP)	87 Watt	80 Watt

---

Should you still have questions on choice between Core i5-661 and Xeon E5606, 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.

---