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Celeron 3855U vs Pentium D 925


Description
The 3855U is based on Skylake architecture while the 925 is based on NetBurst.

Using the multithread performance as a reference, the 3855U gets a score of 24.6 k points while the 925 gets 14 k points.

Summarizing, the 3855U is 1.8 times faster than the 925. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
406e3
f65
Core
Skylake-U
Presler
Architecture
Base frecuency
1.6 GHz
3 GHz
Socket
BGA1356
LGA 775
Cores/Threads
2/2
2/2
TDP
15 W
95 W
Cache L1 (d+i)
2x32+2x32 kB
16+8 kB
Cache L2
2x256 kB
4096 kB
Cache L3
2096 kB
0 kB
Date
December 2015
October 2006
Mean monothread perf.
19.24k points
7.7k points
Mean multithread perf.
24.56k points
14.03k points

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
3855U
925
Test#1 (Integers)
1.64k
1.52k (x0.93)
Test#2 (FP)
6.72k
2.95k (x0.44)
Test#3 (Generic, ZIP)
2.06k
1.51k (x0.73)
Test#1 (Memory)
2.4k
0.82k (x0.34)
TOTAL
12.83k
6.79k (x0.53)

Multithread

3855U

925
Test#1 (Integers)
2.2k
2.98k (x1.36)
Test#2 (FP)
9.59k
5.62k (x0.59)
Test#3 (Generic, ZIP)
2.76k
2.87k (x1.04)
Test#1 (Memory)
2.27k
0.82k (x0.36)
TOTAL
16.81k
12.29k (x0.73)

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
3855U
925
Test#1 (Integers)
5.93k
2.06k (x0.35)
Test#2 (FP)
8.53k
3.32k (x0.39)
Test#3 (Generic, ZIP)
2.28k
1.52k (x0.67)
Test#1 (Memory)
2.5k
0.8k (x0.32)
TOTAL
19.24k
7.7k (x0.4)

Multithread

3855U

925
Test#1 (Integers)
7.87k
4k (x0.51)
Test#2 (FP)
11.28k
6.32k (x0.56)
Test#3 (Generic, ZIP)
2.91k
2.91k (x1)
Test#1 (Memory)
2.5k
0.81k (x0.32)
TOTAL
24.56k
14.03k (x0.57)

Performance/W
3855U
925
Test#1 (Integers)
524 points/W
42 points/W
Test#2 (FP)
752 points/W
67 points/W
Test#3 (Generic, ZIP)
194 points/W
31 points/W
Test#1 (Memory)
166 points/W
9 points/W
TOTAL
1637 points/W
148 points/W

Performance/GHz
3855U
925
Test#1 (Integers)
3706 points/GHz
686 points/GHz
Test#2 (FP)
5333 points/GHz
1105 points/GHz
Test#3 (Generic, ZIP)
1423 points/GHz
507 points/GHz
Test#1 (Memory)
1562 points/GHz
266 points/GHz
TOTAL
12024 points/GHz
2565 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. 3.11.4