Multi-Core Scaling: Intel Core i7 920 (Overclocked)

Multi-threaded Pi Benchmark: y-cruncher v0.5.4

By Alexander J. Yee

(Last updated: May 13, 2010)

 

 

 

 

Benchmark Settings

Mode: Ram Only
Algorithm: Chudnovsky Formula
Priority: Above Normal

1 thread
  • Hyper-Threading disabled via BIOS
  • Processor Affinity set to allow only 1 core
  • y-cruncher set to use 1 thread
2 threads
  • Hyper-Threading disabled via BIOS
  • Processor Affinity set to allow only 2 cores
  • y-cruncher set to use 2 threads
4 threads
  • Hyper-Threading disabled via BIOS
  • y-cruncher set to use 4 threads
8 threads
  • Hyper-Threading enabled
  • y-cruncher set to use 8 threads

Benchmarks

All times in seconds. All times include base-conversions.

 

Note that when comparing these benchmarks to that of previous versions of y-cruncher, it appears that multi-core scaling is worse in newer versions.

This is because y-cruncher is limited by memory bandwidth on this system.

 

As y-cruncher gets faster due to optimizations, it needs more bandwidth. Therefore, newer versions of y-cruncher are more bottlenecked by memory bandwidth than previous versions.

Processor(s):
2.67 GHz Intel Core i7 - 920 Bloomsfield - Overclock to 3.34 GHz (3.5 GHz Turbo Boost)
Memory:
12 GB DDR3 - 1333 MHz (triple channel)
Courtesy Of:
Alexander Yee
Version:
v0.5.4.9141 (x64 SSE4.1 ~ Ushio)
Decimal Digits
1 thread
2 threads
4 threads
8 threads
2-t scaling
4-t scaling
8-t scaling
10,000
 0.015 0.015 0.014 0.014 1.000 1.071 1.071
12,000
 0.014 0.016 0.014 0.015 0.875 1.000 0.933
15,000
 0.016 0.017 0.015 0.015 0.941 1.067 1.067
20,000
 0.017 0.018 0.016 0.017 0.944 1.063 1.000
25,000
 0.018 0.019 0.018 0.018 0.947 1.000 1.000
40,000
 0.022 0.024 0.022 0.023 0.917 1.000 0.957
50,000
 0.027 0.027 0.026 0.026 1.000 1.038 1.038
75,000
 0.035 0.033 0.032 0.033 1.061 1.094 1.061
100,000
 0.046 0.042 0.04 0.041 1.095 1.150 1.122
120,000
 0.054 0.05 0.048 0.049 1.080 1.125 1.102
150,000
 0.067 0.056 0.055 0.056 1.196 1.218 1.196
200,000
 0.094 0.071 0.068 0.068 1.324 1.382 1.382
250,000
 0.119 0.09 0.085 0.085 1.322 1.400 1.400
400,000
 0.207 0.153 0.146 0.146 1.353 1.418 1.418
500,000
 0.268 0.185 0.172 0.172 1.449 1.558 1.558
750,000
 0.432 0.286 0.248 0.25 1.510 1.742 1.728
1,000,000
 0.61 0.383 0.31 0.312 1.593 1.968 1.955
1,200,000
 0.76 0.476 0.387 0.387 1.597 1.964 1.964
1,500,000
 0.993 0.6 0.475 0.478 1.655 2.091 2.077
2,000,000
 1.394 0.805 0.601 0.602 1.732 2.319 2.316
2,500,000
 1.82 1.052 0.794 0.796 1.730 2.292 2.286
4,000,000
 3.198 1.689 1.189 1.221 1.893 2.690 2.619
5,000,000
 4.156 2.18 1.516 1.528 1.906 2.741 2.720
7,500,000
 6.789 3.494 2.055 2.185 1.943 3.304 3.107
10,000,000
 9.463 4.852 2.795 2.904 1.950 3.386 3.259
12,000,000
 11.882 6.064 3.416 3.548 1.959 3.478 3.349
15,000,000
 15.388 7.839 4.328 4.145 1.963 3.555 3.712
20,000,000
 21.563 10.965 5.991 5.731 1.967 3.599 3.763
25,000,000
 28.059 14.241 7.683 7.29 1.970 3.652 3.849
40,000,000
 48.708 24.702 13.049 12.351 1.972 3.733 3.944
50,000,000
 63.002 31.931 16.93 15.96 1.973 3.721 3.947
75,000,000
 101.796 51.547 27.442 25.381 1.975 3.709 4.011
100,000,000
 141.494 71.529 37.929 35.395 1.978 3.730 3.998
120,000,000
 173.027 87.505 46.05 43.39 1.977 3.757 3.988
150,000,000
 228.072 115.154 60.606 56.609 1.981 3.763 4.029
200,000,000
 316.097 159.614 83.43 78.15 1.980 3.789 4.045
250,000,000
 409.279 206.608 109.012 101.053 1.981 3.754 4.050
400,000,000
 703.526 354.978 185.845 171.999 1.982 3.786 4.090
500,000,000
 909.574 458.901 237.326 221.866 1.982 3.833 4.100
750,000,000
 1,459.61 736.02 381.445 356.335 1.983 3.827 4.096
1,000,000,000
 2,028.30 1,024.36 529.628 495.791 1.980 3.830 4.091
1,200,000,000
 2,435.62 1,229.93 636.806 593.426 1.980 3.825 4.104
1,500,000,000
 3,214.44 1,620.91 841.317 783.897 1.983 3.821 4.101
2,000,000,000
 4,428.41 2,245.75 1,174.74 1,082.11 1.972 3.770 4.092
2,500,000,000
 5,655.46 2,848.94 1,472.40 1,399.39 1.985 3.841 4.041

 


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