Phenom II X4 945 (125W) vs Ryzen 7 1800X

Primary details

Comparing Ryzen 7 1800X and Phenom II X4 945 (125W) processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	731	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	3.60	no data
Market segment	Desktop processor	Desktop processor
Series	AMD Ryzen 7	no data
Architecture codename	Zen (2017−2020)	Deneb (2009−2011)
Release date	22 February 2017 (7 years ago)	23 April 2009 (15 years ago)
Launch price (MSRP)	$499	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Ryzen 7 1800X and Phenom II X4 945 (125W) 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	8 (Octa-Core)	4 (Quad-Core)
Threads	16	4
Base clock speed	3.6 GHz	3 GHz
Boost clock speed	4 GHz	3 GHz
Bus rate	4 × 8 GT/s	no data
Multiplier	36	no data
L1 cache	768 KB	128 KB (per core)
L2 cache	4096 KB	512 KB (per core)
L3 cache	16384 KB	6 MB (shared)
Chip lithography	14 nm	45 nm
Die size	213 mm2	258 mm2
Number of transistors	4800 Million	758 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	+	-

Compatibility

Information on Ryzen 7 1800X and Phenom II X4 945 (125W) 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	AM4	AM3
Power consumption (TDP)	95 Watt	125 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Ryzen 7 1800X and Phenom II X4 945 (125W). You'll probably need this information if you require some particular technology.

Instruction set extensions	XFR, FMA3, SSE 4.2, AVX2, SMT	no data
AES-NI	+	-
FMA	FMA3	-
AVX	+	-
XFR	+	-
SenseMI	+	-

Virtualization technologies

Virtual machine speed-up technologies supported by Ryzen 7 1800X and Phenom II X4 945 (125W) are enumerated here.

AMD-V

+

+

Memory specs

Types, maximum amount and channel quantity of RAM supported by Ryzen 7 1800X and Phenom II X4 945 (125W). Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4	DDR3
Maximum memory size	64 GB	no data
Max memory channels	2	no data
Maximum memory bandwidth	42.671 GB/s	no data
ECC memory support	+	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

-

On certain motherboards (Chipset feature)

Peripherals

Specifications and connection of peripherals supported by Ryzen 7 1800X and Phenom II X4 945 (125W).

PCIe version	n/a	2.0
PCI Express lanes	20	no data

Pros & cons summary

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Recency	22 February 2017	23 April 2009
Physical cores	8	4
Threads	16	4
Chip lithography	14 nm	45 nm
Power consumption (TDP)	95 Watt	125 Watt

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Should you still have questions on choice between Ryzen 7 1800X and Phenom II X4 945 (125W), ask them in Comments section, and we shall answer.

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