Intel Core i5-8400T vs Intel Core Ultra 7 255H

Compare Intel 8th Generation Core i5 6 core CPU vs Intel Core Ultra (Series 2) 16 core processor, specs and benchmark score. Which is the better CPU for gaming?

CPU Comparison

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Benchmark Score

Overall Score

A combined score of all workloads

2711 points
2788 points
2% slightly better overall score

Gaming Score

The raw gaming performance with a fast GPU

4534 points
31% slightly better gaming score
3457 points

Multitasking Score

Performance in workloads using up to 8 cores

2166 points
2584 points
19% slightly better multitasking score

Heavy Workload Score

Performance in workloads using up to 16 cores

2082 points
2521 points
21% slightly better heavy workload score

Free CPU Benchmark

Want to compare your processor against the Core i5-8400T and the Core Ultra 7 255H? Download our free and quick PC Performance Test.

Other Benchmarks

Blender score

Blender score

Cycles Render (Samples per minute)

60.18 points
212.94 points
253% significantly higher Blender score
Geekbench 6 (multi) score

Geekbench 6 (multi) score

Multi threaded benchmark

3918 points
13475 points
243% significantly higher Geekbench 6 (multi) score
Geekbench 6 (single) score

Geekbench 6 (single) score

Single threaded benchmark

1115 points
2524 points
126% significantly higher Geekbench 6 (single) score

Specifications

Cores

Number of physical processing units

6
16
166% significantly more cores

Threads

Number of logical processing units

6
16
166% significantly more threads

Clock Speed

Base frequency at which the chip operates

1.7 GHz
2 GHz
17% slightly higher clock speed

Turbo Speed

Higher frequency used for heavy workloads

3.3 GHz
5.1 GHz
54% significantly higher turbo speed

PCIe Lanes

Number of physical connections between the CPU and expansion slots

16
28
75% significantly more pcie lanes

Memory Channels

Lanes for simultaneous memory access

2
Identical
2

Supported Memory

Maximum amount of RAM supported by this CPU

128 GiB
Identical
128 GiB

L2 Cache

Secondary embedded memory, slower than L1 cache

1.5 MiB
28 MiB
1766% significantly more L2 cache

L3 Cache

General memory pool for all cores

9 MiB
24 MiB
166% significantly more L3 cache

Other details

Rank

Ranking in the hardwareDB database

587th of 1,089
572nd of 1,089

Family

The product line

8th Generation Core i5
Core Ultra (Series 2)

Release date

The official date of release of this chip

2018 May
2025 February

Memory Type

The type of memory used by this chip

DDR4-2666
DDR5-8400

Is Unlocked

Can this CPU can be overclocked

No
-

Supports ECC memory

Does this CPU support error correcting memory

No
No

Core i5-8400T vs Core Ultra 7 255H benchmarks

According to the hardwareDB Benchmark tool, the Core Ultra 7 255H is faster than the Core i5-8400T. Despite this, the Core i5-8400T has the advantage in our gaming benchmark.

When comparing core counts for these CPUs, we notice that the Core Ultra 7 255H has significantly more cores with 16 cores compared to the Core i5-8400T that has 6 cores. It also has more threads than the Core i5-8400T. These CPUs have different clock speeds. Indeed, the Core Ultra 7 255H has a slightly higher clock speed compared to the Core i5-8400T. Also, the Core Ultra 7 255H has a significantly higher turbo speed. The info from our database shows that the Core Ultra 7 255H has more L2 cache than the Core i5-8400T. The Core Ultra 7 255H also has significantly more L3 cache.

The more cores a CPU has, the better the overall performance will be in parallel workloads such as multitasking. Many CPUs have more threads than cores, this means that each physical core is split into multiple logical cores, making them more efficient. For instance, the Core i5-8400T has the same number of threads as cores. This means the the CPU does not support hyperthreading.

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