| | | | | | |

Celeron 3855U vs Core 2 Quad Q8400


Description
The 3855U is based on Skylake architecture while the Q8400 is based on Core.

Using the multithread performance as a reference, the 3855U gets a score of 24.6 k points while the Q8400 gets 51.9 k points.

Summarizing, the Q8400 is 2.1 times faster than the 3855U. To get a proper comparison between both models, take a look to the data shown below.

Specs
CPUID
406e3
1067a
Core
Skylake-U
Yorkfield
Architecture
Base frecuency
1.6 GHz
2.666 GHz
Socket
BGA1356
LGA 775
Cores/Threads
2/2
4/4
TDP
15 W
95 W
Cache L1 (d+i)
2x32+2x32 kB
128+128 kB
Cache L2
2x256 kB
4096 kB
Cache L3
2096 kB
0 kB
Date
December 2015
April 2009
Mean monothread perf.
19.24k points
14.04k points
Mean multithread perf.
24.56k points
51.92k 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
Q8400
Test#1 (Integers)
1.64k
2.44k (x1.49)
Test#2 (FP)
6.72k
6.24k (x0.93)
Test#3 (Generic, ZIP)
2.06k
2.62k (x1.27)
Test#1 (Memory)
2.4k
1.43k (x0.59)
TOTAL
12.83k
12.73k (x0.99)

Multithread

3855U

Q8400
Test#1 (Integers)
2.2k
9.71k (x4.42)
Test#2 (FP)
9.59k
24.81k (x2.59)
Test#3 (Generic, ZIP)
2.76k
10.51k (x3.81)
Test#1 (Memory)
2.27k
2.03k (x0.89)
TOTAL
16.81k
47.05k (x2.8)

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
Q8400
Test#1 (Integers)
5.93k
3.08k (x0.52)
Test#2 (FP)
8.53k
6.8k (x0.8)
Test#3 (Generic, ZIP)
2.28k
2.73k (x1.2)
Test#1 (Memory)
2.5k
1.42k (x0.57)
TOTAL
19.24k
14.04k (x0.73)

Multithread

3855U

Q8400
Test#1 (Integers)
7.87k
12.25k (x1.56)
Test#2 (FP)
11.28k
26.84k (x2.38)
Test#3 (Generic, ZIP)
2.91k
10.82k (x3.72)
Test#1 (Memory)
2.5k
2.02k (x0.81)
TOTAL
24.56k
51.92k (x2.11)

Performance/W
3855U
Q8400
Test#1 (Integers)
524 points/W
129 points/W
Test#2 (FP)
752 points/W
283 points/W
Test#3 (Generic, ZIP)
194 points/W
114 points/W
Test#1 (Memory)
166 points/W
21 points/W
TOTAL
1637 points/W
547 points/W

Performance/GHz
3855U
Q8400
Test#1 (Integers)
3706 points/GHz
1157 points/GHz
Test#2 (FP)
5333 points/GHz
2551 points/GHz
Test#3 (Generic, ZIP)
1423 points/GHz
1025 points/GHz
Test#1 (Memory)
1562 points/GHz
532 points/GHz
TOTAL
12024 points/GHz
5265 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