Ryzen 9 3900XT vs Pentium D 840

Primary details

Comparing Pentium D 840 and Ryzen 9 3900XT processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	not rated	268
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	no data	26.28
Market segment	Desktop processor	Desktop processor
Series	no data	AMD Ryzen 9
Power efficiency	no data	18.53
Architecture codename	Smithfield (2005)	Matisse 2 (2020)
Release date	May 2005 (19 years ago)	16 June 2020 (4 years ago)
Launch price (MSRP)	no data	$499

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Pentium D 840 and Ryzen 9 3900XT 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)	12 (Dodeca-Core)
Threads	2	24
Base clock speed	3.2 GHz	3.8 GHz
Boost clock speed	3.2 GHz	4.7 GHz
L1 cache	28 KB	768 KB
L2 cache	2 MB	6 MB
L3 cache	0 KB	64 MB
Chip lithography	90 nm	7 nm, 12 nm
Die size	206 mm2	74 mm2
Maximum core temperature	70 °C	no data
Maximum case temperature (TCase)	no data	95 °C
Number of transistors	169 million	3,800 million
64 bit support	+	+
Windows 11 compatibility	-	+
Unlocked multiplier	-	+
VID voltage range	1.2V-1.4V	no data

Compatibility

Information on Pentium D 840 and Ryzen 9 3900XT 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	PLGA775	AM4
Power consumption (TDP)	130 Watt	105 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 840 and Ryzen 9 3900XT. You'll probably need this information if you require some particular technology.

AES-NI	-	+
AVX	-	+
Enhanced SpeedStep (EIST)	+	no data
Turbo Boost Technology	-	no data
Hyper-Threading Technology	-	no data
Idle States	+	no data
Demand Based Switching	-	no data
PAE	32 Bit	no data
FSB parity	-	no data
Precision Boost 2	no data	+

Security technologies

Pentium D 840 and Ryzen 9 3900XT technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	no data
EDB	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Pentium D 840 and Ryzen 9 3900XT are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Pentium D 840 and Ryzen 9 3900XT. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR1, DDR2, DDR3	DDR4-3200
Maximum memory size	no data	128 GB
Max memory channels	no data	2
Maximum memory bandwidth	no data	51.196 GB/s
ECC memory support	-	+

Peripherals

Specifications and connection of peripherals supported by Pentium D 840 and Ryzen 9 3900XT.

PCIe version

no data

4.0

Pros & cons summary

---

Physical cores	2	12
Threads	2	24
Chip lithography	90 nm	7 nm
Power consumption (TDP)	130 Watt	105 Watt

---

Should you still have questions on choice between Pentium D 840 and Ryzen 9 3900XT, 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.

---