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The Underclocking Experiment

The Underclocking Experiment - PCSTATS
Abstract: PCstats knows overclocking. You know overclocking. This got us thinking though; what about underclocking?
Filed under: CPU / Processors Published:  Author: 
External Mfg. Website: PCstats Dec 23 2005   Mike Dowler  
Home > Reviews > CPU / Processors > PCstats

Underclocked Benchmarks: 3DMark 2001SE, 3DMark2005

3DMark2001 Source: FutureMark

By combining DirectX8 support with completely new graphics, 3DMark 2001 SE continues to provide a good overall system benchmark. 3DMark2001 SE was created in co-operation with the major 3D accelerator and processor manufacturers to provide a reliable set of diagnostic tools. The suite demonstrates 3D gaming performance by using real-world gaming technology to test a system's true abilities. Tests include: DirectX8 Vertex Shaders, Pixel Shaders and Point Sprites, DOT3 and Environment Mapped Bump Mapping, support for Full Scene Anti-aliasing and Texture Compression and two game tests using Ipion real-time physics. Higher 3DMark scores denote better performance.

3DMark 2001SE
Clock speed Points Ranking
2.4GHz 27628
2.3GHz 26933
2.2GHz 26224
2.1GHz 25593
2.0GHz 24819
1.9GHz 23825
1.8GHz 23249
1.7GHz 22303
1.6GHz 21440
1.5GHz 20412
1.4GHz 19514
1.3GHz 17532
1.2GHz 16490
1.1GHz 15466
1.0GHz 15194
900MHz 14142
800MHz 12892

Performance in 3Dmark2001SE drops sharply at the lowest speeds, but overall the benchmark shows a fairly smooth decline in performance. Even at 1GHz below its rated speed, the 4000+ chip still flirts with 20K, which is quite impressive. At a third of the processor's stock speed, performance in 3Dmark2001SE drops by a little over half.

3DMark05 Source: FutureMark

3DMark05 is the latest version of the highly favoured 3DMark graphics benchmarking series. It is the first benchmark to require DirectX®9.0 compliant hardware with support for Pixel Shader 2.0 or higher.

3DMark05
Overall: Points Ranking
2.4GHz 5711
2.3GHz 5684
2.2GHz 5651
2.1GHz 5633
2.0GHz 5619
1.9GHz 5586
1.8GHz 5566
1.7GHz 5541
1.6GHz 5507
1.5GHz 5383
1.4GHz 5360
1.3GHz 5215
1.2GHz 5046
1.1GHz 4816
1.0GHz 4776
900MHz 4453
800MHz 4139
CPU: Points Ranking
2.4GHz 5000
2.3GHz 4848
2.2GHz 4891
2.1GHz 4668
2.0GHz 4465
1.9GHz 4292
1.8GHz 4131
1.7GHz 3828
1.6GHz 3787
1.5GHz 3622
1.4GHz 3412
1.3GHz 2918
1.2GHz 2728
1.1GHz 2556
1.0GHz 2552
900MHz 2261
800MHz 1989

It's no surprise that the 3DMark2005 overall score remains high throughout the test, since this benchmark is much more dependent on the video card than the processor. The CPU rating plunges as expected, with the 800MHz score ending up a fair bit under half that of the stock speed score. The large 500 point drop between 1.4 and 1.3GHZ is notable.

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Contents of Article: PCstats
 Pg 1.  The Underclocking Experiment
 Pg 2.  Procedure, temperatures and voltages
 Pg 3.  — Underclocked Benchmarks: 3DMark 2001SE, 3DMark2005
 Pg 4.  Underclocked Benchmarks: SuperPI and conclusions

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