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Core i5-10400T vs Celeron 3855U


Description
The i5-10400T is based on Comet Lake architecture while the 3855U is based on Skylake.

Using the multithread performance as a reference, the i5-10400T gets a score of 229.4 k points while the 3855U gets 24.6 k points.

Summarizing, the i5-10400T is 9.3 times faster than the 3855U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
a0653
406e3
Core
Comet Lake-S
Skylake-U
Architecture
Base frecuency
2 GHz
1.6 GHz
Boost frecuency
3.6 GHz
1.6 GHz
Socket
FC-LGA 1200
BGA1356
Cores/Threads
6/12
2/2
TDP
35 W
15 W
Cache L1 (d+i)
6x32+6x32 kB
2x32+2x32 kB
Cache L2
6x256 kB
2x256 kB
Cache L3
12288 kB
2096 kB
Date
April 2020
December 2015

Non-optimized benchmark
The benchmark in Mode 0 (FPU) measures cpu performance with non-optimized software. It uses the basic µinstructions from the i386 architecture with the i387 floating point unit. This mode is compatible with all CPUs so it's practical to compare very different CPUs
Monothread
i5-10400T
3855U
Test#1 (Integers)
4004
1643 (-58.96%)
Test#2 (FP)
14189
6721 (-52.63%)
Test#3 (Generic, ZIP)
4620
2063 (-55.34%)
Test#1 (Memory)
11029
2404 (-78.21%)
TOTAL
33842
12831 (-62.09%)

Multithread

i5-10400T

3855U
Test#1 (Integers)
22767
2196 (-90.36%)
Test#2 (FP)
96586
9586 (-90.08%)
Test#3 (Generic, ZIP)
31652
2758 (-91.29%)
Test#1 (Memory)
2451
2270 (-7.39%)
TOTAL
153456
16809 (-89.05%)

SSE3 optimized benchmark
The benchmark in mode I (SSE) is optimized for the use of SIMD instructions with 128 bits register and the SSE set up to version 3. Nearly every modern CPU has support for this mode.
Monothread
i5-10400T
3855U
Test#1 (Integers)
12610
5930 (-52.97%)
Test#2 (FP)
17941
8533 (-52.44%)
Test#3 (Generic, ZIP)
4828
2277 (-52.84%)
Test#1 (Memory)
10811
2499 (-76.88%)
TOTAL
46191
19239 (-58.35%)

Multithread

i5-10400T

3855U
Test#1 (Integers)
74617
7867 (-89.46%)
Test#2 (FP)
119634
11283 (-90.57%)
Test#3 (Generic, ZIP)
32645
2910 (-91.09%)
Test#1 (Memory)
2520
2496 (-0.95%)
TOTAL
229416
24556 (-89.30%)

Performance/W
i5-10400T
3855U
Test#1 (Integers)
2132 points/W
524 points/W
Test#2 (FP)
3418 points/W
752 points/W
Test#3 (Generic, ZIP)
933 points/W
194 points/W
Test#1 (Memory)
72 points/W
166 points/W
TOTAL
6555 points/W
1637 points/W

Performance/GHz
i5-10400T
3855U
Test#1 (Integers)
3503 points/GHz
3706 points/GHz
Test#2 (FP)
4984 points/GHz
5333 points/GHz
Test#3 (Generic, ZIP)
1341 points/GHz
1423 points/GHz
Test#1 (Memory)
3003 points/GHz
1562 points/GHz
TOTAL
12831 points/GHz
12024 points/GHz

Monothread performance graph
Monothread performance graphics gives the performance vs time. They are useful to measure the time it takes to the CPU to reach the maximum performance.

Usually, CPU's performance will be steady during these tests but if it has a slow frequency strategy, the first samples will show a lower score.


Test#1 (Integers) [points vs time]

grafica bm.hardlimit.com


Test#2 (FP) [points vs time]

grafica bm.hardlimit.com


Test#3 (Generic, ZIP) [points vs time]

grafica bm.hardlimit.com


Test#1 (Memory) [points vs time]

grafica bm.hardlimit.com

Multithread performance graph
Multithread graphs measure the performance against a heavy load during certain time.

If CPU's TDP doesn't limit the frequency and the machine is properly cooled, performance should remain steady vs time. Otherwise, the performance score will oscillate or decrease over time.


Test#1 (Integers) [points vs time]

grafica bm.hardlimit.com


Test#2 (FP) [points vs time]

grafica bm.hardlimit.com


Test#3 (Generic, ZIP) [points vs time]

grafica bm.hardlimit.com


Test#1 (Memory) [points vs time]

grafica bm.hardlimit.com

Hardlimit Benchmark Central - Ver. 3.7.9