Ryzen 9 3900XT vs i5-8400

Primary details

Comparing Core i5-8400 and Ryzen 9 3900XT processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1128	274
Place by popularity	63	not in top-100
Cost-effectiveness evaluation	4.94	26.04
Market segment	Desktop processor	Desktop processor
Series	Intel Core i5	AMD Ryzen 9
Power efficiency	8.45	18.52
Architecture codename	Coffee Lake-S (2017−2018)	Matisse 2 (2020)
Release date	5 October 2017 (7 years ago)	7 July 2020 (4 years ago)
Launch price (MSRP)	$182	$499

Cost-effectiveness evaluation

Performance per price, higher is better.

Ryzen 9 3900XT has 427% better value for money than i5-8400.

Detailed specifications

Core i5-8400 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	6 (Hexa-Core)	12 (Dodeca-Core)
Threads	6	24
Base clock speed	2.8 GHz	3.8 GHz
Boost clock speed	4 GHz	4.7 GHz
Bus type	DMI 3.0	no data
Bus rate	4 × 8 GT/s	no data
Multiplier	28	no data
L1 cache	64K (per core)	96K (per core)
L2 cache	256K (per core)	512K (per core)
L3 cache	9 MB (shared)	64 MB
Chip lithography	14 nm	7 nm, 12 nm
Die size	149 mm2	74 mm2
Maximum core temperature	100 °C	no data
Maximum case temperature (TCase)	72 °C	95 °C
Number of transistors	no data	3,800 million
64 bit support	+	+
Windows 11 compatibility	+	+
Unlocked multiplier	-	+

Compatibility

Information on Core i5-8400 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	1 (Uniprocessor)	1
Socket	FCLGA1151	AM4
Power consumption (TDP)	65 Watt	105 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i5-8400 and Ryzen 9 3900XT. You'll probably need this information if you require some particular technology.

Instruction set extensions	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2	no data
AES-NI	+	+
AVX	+	+
vPro	+	no data
Enhanced SpeedStep (EIST)	+	no data
Turbo Boost Technology	2.0	no data
Hyper-Threading Technology	-	no data
Idle States	+	no data
Thermal Monitoring	+	-
Precision Boost 2	no data	+

Security technologies

Core i5-8400 and Ryzen 9 3900XT technologies aimed at improving security, for example, by protecting against hacks.

TXT	-	no data
EDB	+	no data
Secure Key	+	no data
MPX	+	-
Identity Protection	+	-
SGX	Yes with Intel® ME	no data
OS Guard	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core i5-8400 and Ryzen 9 3900XT are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core i5-8400 and Ryzen 9 3900XT. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3, DDR4	DDR4-3200
Maximum memory size	128 GB	128 GB
Max memory channels	2	2
Maximum memory bandwidth	42.671 GB/s	51.196 GB/s
ECC memory support	-	+

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel UHD Graphics 630	-
Max video memory	64 GB	-
Quick Sync Video	+	-
Clear Video	+	-
Clear Video HD	+	-
Graphics max frequency	1.05 GHz	-
InTru 3D	+	-

Graphics interfaces

Available interfaces and connections of Core i5-8400 and Ryzen 9 3900XT integrated GPUs.

Number of displays supported

3

-

Graphics image quality

Maximum display resolutions supported by Core i5-8400 and Ryzen 9 3900XT integrated GPUs, including resolutions over different interfaces.

4K resolution support	+	-
Max resolution over HDMI 1.4	4096x2304@24Hz	-
Max resolution over eDP	4096x2304@60Hz	-
Max resolution over DisplayPort	4096x2304@60Hz	-

Graphics API support

APIs supported by Core i5-8400 and Ryzen 9 3900XT integrated GPUs, sometimes API versions are included.

DirectX	12	-
OpenGL	4.5	-

Peripherals

Specifications and connection of peripherals supported by Core i5-8400 and Ryzen 9 3900XT.

PCIe version	3.0	4.0
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	5.81	20.56
Recency	5 October 2017	7 July 2020
Physical cores	6	12
Threads	6	24
Chip lithography	14 nm	7 nm
Power consumption (TDP)	65 Watt	105 Watt

---

Should you still have questions on choice between Core i5-8400 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.

---