Core Ultra 5 135H vs Core 2 Duo P8400

Place in the ranking	2841	491
Place by popularity	not in top-100	not in top-100
Market segment	Laptop	Laptop
Series	Intel Core 2 Duo	Intel Meteor Lake-H
Power efficiency	2.04	48.94
Architecture codename	Penryn (2008−2011)	Meteor Lake-H (2023)
Release date	15 July 2008 (16 years ago)	14 December 2023 (less than a year ago)
Launch price (MSRP)	$209	$342

Detailed specifications

Core 2 Duo P8400 and Core Ultra 5 135H 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)	14 (Tetradeca-Core)
Threads	2	18
Base clock speed	2.26 GHz	3.6 GHz
Boost clock speed	2.26 GHz	4.6 GHz
Bus rate	1066 MHz	no data
L1 cache	128 KB	112 KB (per core)
L2 cache	3 MB	2 MB (per core)
L3 cache	3 MB L2 Cache	18 MB (shared)
Chip lithography	45 nm	Intel 4 nm
Die size	107 mm²	no data
Maximum core temperature	105 °C	110 °C
Number of transistors	410 Million	no data
64 bit support	+	+
Windows 11 compatibility	-	no data
VID voltage range	1.05V-1.15V	no data

Compatibility

Information on Core 2 Duo P8400 and Core Ultra 5 135H 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	no data	1
Socket	BGA479,PBGA479,PGA478	FCBGA2049
Power consumption (TDP)	25 Watt	28 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Duo P8400 and Core Ultra 5 135H. You'll probably need this information if you require some particular technology.

Instruction set extensions	no data	Intel® SSE4.1, Intel® SSE4.2, Intel® AVX2
AES-NI	-	+
AVX	-	+
vPro	no data	+
Enhanced SpeedStep (EIST)	+	+
Speed Shift	no data	+
Turbo Boost Technology	-	no data
Hyper-Threading Technology	-	+
TSX	-	+
Idle States	+	no data
Thermal Monitoring	-	+
Flex Memory Access	no data	+
SIPP	-	+
Demand Based Switching	-	no data
Turbo Boost Max 3.0	no data	-
FSB parity	-	no data
Deep Learning Boost	-	+
Supported AI Software Frameworks	-	OpenVINO™, WindowsML, ONNX RT

Security technologies

Core 2 Duo P8400 and Core Ultra 5 135H technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	+
Secure Key	no data	+
OS Guard	no data	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core 2 Duo P8400 and Core Ultra 5 135H are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core 2 Duo P8400 and Core Ultra 5 135H. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	no data	DDR5
Maximum memory size	no data	96 GB
Max memory channels	no data	2

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card	no data	Intel® Arc™ graphics
Quick Sync Video	-	+
Graphics max frequency	no data	2.2 GHz

Graphics interfaces

Available interfaces and connections of Core 2 Duo P8400 and Core Ultra 5 135H integrated GPUs.

Number of displays supported

no data

Graphics image quality

Maximum display resolutions supported by Core 2 Duo P8400 and Core Ultra 5 135H integrated GPUs, including resolutions over different interfaces.

Max resolution over HDMI 1.4	no data	4096 x 2304 @ 60Hz (HDMI 2.1 TMDS) 7680 x 4320 @ 60Hz (HDMI2.1 FRL)
Max resolution over eDP	no data	3840x2400 @ 120Hz
Max resolution over DisplayPort	no data	7680 x 4320 @ 60Hz

Graphics API support

APIs supported by Core 2 Duo P8400 and Core Ultra 5 135H integrated GPUs, sometimes API versions are included.

DirectX	no data	12.2
OpenGL	no data	4.6

Peripherals

Specifications and connection of peripherals supported by Core 2 Duo P8400 and Core Ultra 5 135H.

PCIe version	no data	5.0
PCI Express lanes	no data	8
PCI support	no data	5.0 and 4.0

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 2 Duo P8400 0.54

Ultra 5 135H 14.54
+2593%

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

Core 2 Duo P8400 849

Ultra 5 135H 23018
+2611%

Gaming performance

Pros & cons summary

Performance score	0.54	14.54
Recency	15 July 2008	14 December 2023
Physical cores	2	14
Threads	2	18
Power consumption (TDP)	25 Watt	28 Watt

Core 2 Duo P8400 has 12% lower power consumption.

Ultra 5 135H, on the other hand, has a 2592.6% higher aggregate performance score, an age advantage of 15 years, and 600% more physical cores and 800% more threads.

The Core Ultra 5 135H is our recommended choice as it beats the Core 2 Duo P8400 in performance tests.

Should you still have questions on choice between Core 2 Duo P8400 and Core Ultra 5 135H, ask them in Comments section, and we shall answer.