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Overclocking: Fixed Clock Multiplier

DDR for Pentium III: 10 Boards with VIA Apollo Pro 266
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It's common knowledge that the majority of Pentium III and Celeron processors have a lock on their multipliers, which, unlike AMD processors, cannot be unlocked. The only possibility of overclocking this kind of CPU is to pump up the front side bus.

Two prerequisites must be met in order to overclock a P3 successfully and painlessly - the FSB should ideally be adjustable in increments of 1 MHz. In addition, increasing your CPU core voltage in small increments of 0.05 volts keeps your system more stable. Although Asus has a good reputation for stability and capability when overclocked, when compared to the other test candidates you can see that the Asus CUV266 we tested does not offer increments of 1 MHz for the entire FSB range. The range remains, however, very large - it reaches from 66 MHz to 202 MHz. Don't take the last number too seriously, though - this setting is only interesting in theory and would violate all the laws of electrical engineering.

The Chaintech CT-6VJD, the Shuttle AV30 and the Soyo SY-7VDA are good overclocking candidates, since they meet all the criteria for 1 MHz FSB and the CPU core with 0.05 volt increments.

Test Configuration

Hardware
CPU Pentium III 1.0 GHz (133 MHz FSB)
Memory Micron 128 MB PC2100 DDR SDRAM CL2.5
Hard disk IBM DTLA-307030, 30.7 GByte
UltraDMA/100, 7200 rpm
Graphics card Asus V7700 AGP, nVIDIA GeForce2 GTS, 32 MB DDR SDRAM
Drivers & Software
HDD / Motherboard / AGP driver VIA 4in1 V4.29Final, AGP V4.05b
Graphics driver Detonator 4 Series V6.32
DirectX Version 8.0a (German)
Operating System Windows 98 SE, Version 4.10.2222 A
Benchmarks and Settings
Quake III Arena Retail Version
command line = +set cd_nocd 1 +set s_initsound 0
Graphics detail set to 'Normal', 640x480x16
Benchmark using 'Q3DEMO1'
Sysmark 2000 Patch 4B (1024x768x16x85)
ViewPerf Version 6.1.2 (1280x1024x16x85)
Linux Kernel Compilation SuSE Linux 6.4, Kernel 2.2.14, THG benchmarking kernel, gcc 2.95.2
Flask mpeg4 Encoding Video Codec: DivX 3.11 alpha, Fast-Motion, keyframe every 10 seconds, compression 100, data rate 910 kbps
Audio Codec: audio not processed
Video Resolution: 720x576, 25 fps, interlaced
Resizing: Nearest Neighbor
Unreal Tournament V4.28 UTBench (640x480x16x85)
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