Ryzen 9 7900X3D vs i5-8400H

Primary details

Comparing Core i5-8400H and Ryzen 9 7900X3D processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1255	130
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	no data	49.27
Market segment	Laptop	Desktop processor
Series	Intel Core i5	AMD Ryzen 9
Power efficiency	10.12	25.03
Architecture codename	Coffee Lake-H (2018−2019)	Raphael (2023−2024)
Release date	2 April 2018 (6 years ago)	4 January 2023 (1 year ago)
Launch price (MSRP)	$250	$599

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Core i5-8400H and Ryzen 9 7900X3D 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	4 (Quad-Core)	12 (Dodeca-Core)
Threads	8	24
Base clock speed	2.5 GHz	4.4 GHz
Boost clock speed	4.2 GHz	5.6 GHz
Bus type	DMI 3.0	no data
Bus rate	4 × 8 GT/s	no data
Multiplier	25	no data
L1 cache	64K (per core)	64K (per core)
L2 cache	256K (per core)	1 MB (per core)
L3 cache	12 MB (shared)	128 MB (shared)
Chip lithography	14 nm	5 nm, 6 nm
Die size	126 mm2	2x 71 mm2
Maximum core temperature	100 °C	no data
Maximum case temperature (TCase)	72 °C	47 °C
Number of transistors	no data	13,140 million
64 bit support	+	+
Windows 11 compatibility	+	+
Unlocked multiplier	-	+

Compatibility

Information on Core i5-8400H and Ryzen 9 7900X3D 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	FCBGA1440	AM5
Power consumption (TDP)	45 Watt	120 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i5-8400H and Ryzen 9 7900X3D. 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
Speed Shift	+	no data
My WiFi	+	no data
Turbo Boost Technology	2.0	no data
Hyper-Threading Technology	+	no data
TSX	+	-
Idle States	+	no data
Thermal Monitoring	+	-
Flex Memory Access	+	no data
SIPP	+	-
Precision Boost 2	no data	+

Security technologies

Core i5-8400H and Ryzen 9 7900X3D 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 i5-8400H and Ryzen 9 7900X3D 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 i5-8400H and Ryzen 9 7900X3D. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR4	DDR5-5200
Maximum memory size	64 GB	128 GB
Max memory channels	2	no data
Maximum memory bandwidth	42.671 GB/s	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card Compare	Intel UHD Graphics 630	AMD Radeon Graphics
Max video memory	64 GB	no data
Quick Sync Video	+	-
Clear Video	+	no data
Clear Video HD	+	no data
Graphics max frequency	1.1 GHz	no data
InTru 3D	+	no data

Graphics interfaces

Available interfaces and connections of Core i5-8400H and Ryzen 9 7900X3D integrated GPUs.

Number of displays supported	3	no data
eDP	+	no data
DisplayPort	+	-
HDMI	+	-
DVI	+	no data

Graphics image quality

Maximum display resolutions supported by Core i5-8400H and Ryzen 9 7900X3D integrated GPUs, including resolutions over different interfaces.

4K resolution support	+	no data
Max resolution over HDMI 1.4	4096x2304@30Hz	no data
Max resolution over eDP	4096x2304@60Hz	no data
Max resolution over DisplayPort	4096x2304@60Hz	no data
Max resolution over VGA	N/A	no data

Graphics API support

APIs supported by Core i5-8400H and Ryzen 9 7900X3D integrated GPUs, sometimes API versions are included.

DirectX	12	no data
OpenGL	4.5	no data

Peripherals

Specifications and connection of peripherals supported by Core i5-8400H and Ryzen 9 7900X3D.

PCIe version	3.0	5.0
PCI Express lanes	16	24

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	4.81	31.74
Integrated graphics card	3.09	1.98
Recency	2 April 2018	4 January 2023
Physical cores	4	12
Threads	8	24
Chip lithography	14 nm	5 nm
Power consumption (TDP)	45 Watt	120 Watt

---

Should you still have questions on choice between Core i5-8400H and Ryzen 9 7900X3D, 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.

---