To make all this happen, the motherboard BIOS must activate a few registers to provide the required functionality. If this is not the case, the system simply crashes at the very attempt.
| Chipset | Register | Bit/Function |
|---|---|---|
| NVIDIA nForce2* | F6, Bit 4
E7, Bit 4 |
Halt Disconnect
FID_Change Detect |
| VIA KT133A | 55 | Bit 2=1 |
| VIA KT266, KT266A, KT333 | 95 | Bit 2=1 |
| VIA KT333CF, KT400, KT400A, KT600 | D5 | Bit 2=1 |
| *only works on a few boards | ||
Unfortunately, it is only possible to change the multiplier on a few motherboards. One of the fastest, the Asus A7N8X-E, crashed every time we tried.
Multiplier In The BIOS: Boot With What?
As the end-user is mostly also prevented from changing the CPU voltage on the fly (without a reboot), a well-functioning combination of multiplier and CPU voltage must already be selected in the BIOS. What makes this difficult is that most motherboards offer the multipliers x5.0 or x6.0 as their smallest value - none of the mobo-makers offers anything below that.
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Summary
- The AthlonXP At 4.5 Watts
- Applications For Quiet Computers
- An AthlonXP Becomes A Mobile AthlonXP
- Transformation: An AthlonXP Becomes An AthlonXP-M
- We're Off: Building Bridges
- We're Off: Building Bridges, Continued
- The Trick: Changing The Multiplier On The Fly
- Software For Multiplier Adjustment
- Chipset Register For Changing The Multiplier
- System Clock: At Least 100 MHz
- Core Voltage: The Lower The Better
- As A Point Of Comparison: Intel Pentium 4
- Lower Speeds Just By Halving The FSB Clock
- Test System
- CPU Coolers For The AthlonXP
- CPU Coolers For The P4
- Test Results
- Power Loss
- Power Consumption
- Benchmark Results
- Benchmark Results, Continued
- Benchmark Results, Continued
- Benchmark Results, Continued
- Benchmark Results, Continued
- Conclusion
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