Phenom II X4 840 vs Core i5-8400

Primary Details

Comparing Core i5-8400 and Phenom II X4 840 processor market type (desktop or notebook), architecture, sales start time and price.

Place in performance ranking	1014	2000
Place by popularity	79	not in top-100
Cost-Effectiveness Evaluation	10.49	3.08
Market segment	Desktop processor	Desktop processor
Series	Intel Core i5	no data
Architecture codename	Coffee Lake-S (2017−2018)	Propus (2009−2011)
Release date	5 October 2017 (6 years ago)	4 January 2011 (13 years ago)
Launch price (MSRP)	$182	$90
Current price	$140 (0.8x MSRP)	$38 (0.4x MSRP)

Cost-Effectiveness Evaluation

Performance per price, higher is better.

i5-8400 has 241% better value for money than Phenom II X4 840.

Detailed Specifications

Core i5-8400 and Phenom II X4 840 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)	4 (Quad-Core)
Threads	6	4
Base clock speed	2.8 GHz	3.2 GHz
Boost clock speed	4 GHz	3.2 GHz
L1 cache	64K (per core)	128 KB (per core)
L2 cache	256K (per core)	512 KB (per core)
L3 cache	9 MB (shared)	0 KB
Chip lithography	14 nm	45 nm
Die size	149 mm2	169 mm2
Maximum core temperature	100 °C	no data
Maximum case temperature (TCase)	72 °C	no data
Number of transistors	no data	300 million
64 bit support	+	+
Windows 11 compatibility	+	-
Unlocked multiplier	No	No

Compatibility

Information on Core i5-8400 and Phenom II X4 840 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	1
Socket	FCLGA1151	AM3
Power consumption (TDP)	65 Watt	95 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core i5-8400 and Phenom II X4 840. 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	+	no data
AVX	+	no data
vPro	+	no data
Enhanced SpeedStep (EIST)	+	no data
Turbo Boost Technology	2.0	no data
Hyper-Threading Technology	-	no data
TSX	-	no data
Idle States	+	no data
Thermal Monitoring	+	no data
SIPP	-	no data
Status	Discontinued	no data

Security technologies

Core i5-8400 and Phenom II X4 840 technologies aimed at improving security, for example, by protecting against hacks.

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

Virtualization technologies

Virtual machine speed-up technologies supported by Core i5-8400 and Phenom II X4 840 are enumerated here.

AMD-V	+	no data
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 Phenom II X4 840. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3, DDR4	DDR3
Maximum memory size	128 GB	no data
Max memory channels	2	no data
Maximum memory bandwidth	41.6 GB/s	no data
ECC memory support	-	no data

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	Intel UHD Graphics 630	no data
Max video memory	64 GB	no data
Quick Sync Video	+	no data
Clear Video	+	no data
Clear Video HD	+	no data
Graphics max frequency	1.05 GHz	no data
InTru 3D	+	no data

Graphics interfaces

Available interfaces and connections of Core i5-8400 and Phenom II X4 840 integrated GPUs.

Number of displays supported

3

no data

Graphics image quality

Maximum display resolutions supported by Core i5-8400 and Phenom II X4 840 integrated GPUs, including resolutions over different interfaces.

4K resolution support	+	no data
Max resolution over HDMI 1.4	4096x2304@24Hz	no data
Max resolution over eDP	4096x2304@60Hz	no data
Max resolution over DisplayPort	4096x2304@60Hz	no data

Graphics API support

APIs supported by Core i5-8400 and Phenom II X4 840 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 i5-8400 and Phenom II X4 840.

PCIe version	3.0	2.0
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.

Core i5-8400 outperforms Phenom II X4 840 by 285% based on our aggregated benchmark results.

---

Pros & Cons Summary

---

Performance score	5.97	1.55
Recency	5 October 2017	4 January 2011
Physical cores	6	4
Threads	6	4
Cost	$182	$90
Chip lithography	14 nm	45 nm
Power consumption (TDP)	65 Watt	95 Watt

---

Should you still have questions on choice between Core i5-8400 and Phenom II X4 840, 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.

---