i5-660 vs i9-7900X

Primary details

Comparing Core i9-7900X and Core i5-660 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	560	2137
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	2.83	0.10
Market segment	Desktop processor	Desktop processor
Series	Core i9 (Desktop)	no data
Power efficiency	8.96	1.96
Architecture codename	Skylake (server) (2017−2019)	Clarkdale (2010−2011)
Release date	30 May 2017 (7 years ago)	7 January 2010 (14 years ago)
Launch price (MSRP)	$999	$70

Cost-effectiveness evaluation

Performance per price, higher is better.

i9-7900X has 2730% better value for money than i5-660.

Detailed specifications

Core i9-7900X and Core i5-660 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	10 (Deca-Core)	2 (Dual-core)
Threads	20	4
Base clock speed	3.3 GHz	3.33 GHz
Boost clock speed	4.5 GHz	3.6 GHz
Bus type	DMI 3.0	no data
Bus rate	4 × 8 GT/s	2.5 GT/s
Multiplier	33	no data
L1 cache	640 KB	64 KB (per core)
L2 cache	10 MB	256 KB (per core)
L3 cache	13.75 MB	4 MB (shared)
Chip lithography	14 nm	32 nm
Die size	no data	81 mm2
Maximum core temperature	95 °C	73 °C
Maximum case temperature (TCase)	72 °C	no data
Number of transistors	no data	382 million
64 bit support	+	+
Windows 11 compatibility	+	-
Unlocked multiplier	+	-

Compatibility

Information on Core i9-7900X and Core i5-660 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	Socket R4	FCLGA1156
Power consumption (TDP)	140 Watt	73 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i9-7900X and Core i5-660. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2, Intel® AVX-512	Intel® SSE4.2
AES-NI	+	+
AVX	+	-
vPro	+	no data
Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	2.0	1.0
Hyper-Threading Technology	+	+
TSX	+	-
Idle States	no data	+
Demand Based Switching	no data	-
PAE	no data	36 Bit
Turbo Boost Max 3.0	+	no data
FDI	no data	+

Security technologies

Core i9-7900X and Core i5-660 technologies aimed at improving security, for example, by protecting against hacks.

TXT	no data	+
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core i9-7900X and Core i5-660 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i9-7900X and Core i5-660. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4	DDR3
Maximum memory size	128 GB	16.38 GB
Max memory channels	4	2
Maximum memory bandwidth	85.33 GB/s	21 GB/s

Graphics specifications

General parameters of integrated GPUs, if any.

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

Graphics interfaces

Available interfaces and connections of Core i9-7900X and Core i5-660 integrated GPUs.

Number of displays supported

no data

2

Peripherals

Specifications and connection of peripherals supported by Core i9-7900X and Core i5-660.

PCIe version	3.0	2.0
PCI Express lanes	44	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.

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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.

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Pros & cons summary

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Performance score	13.51	1.54
Recency	30 May 2017	7 January 2010
Physical cores	10	2
Threads	20	4
Chip lithography	14 nm	32 nm
Power consumption (TDP)	140 Watt	73 Watt

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Should you still have questions on choice between Core i9-7900X and Core i5-660, ask them in Comments section, and we shall answer.

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