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Overclocking

Clockspeed

The is CPU frequency is calculated by multiplying the FSB with the multiplier of the CPU. Front-Side-Bus (FSB) frequency is the speed between the CPU and Memory Controller (ICH6), and quad-pumped (4x bus speed). The DDR2 Memory speed is between the Memory Module and Memory Controller, it's double-pumped (2x bus speed) and dual-rated. The bus speed is the base clock speed provided by the Phase-Locked-Loop generator.

Windows

Currently the only way to overclock in Windows is by using a program called SetFSB, by Abo from Japan.

The stock 0401 BIOS did not allow for much overclocking. Reverting back to the earlier 8804 BIOS version allowed for impressive results, 997.6 MHz before crashing. For some reason I can't get it over 1 GHz, a problem with the program or PLL maybe?

The current version of SetFSB doesn't support the correct ICS9LPR426AGLF PLL chip yet, but I have contacted the author and he will try to add support for it. In the meantime, it's possible to use the similar ICS9LPRS906CGLF instead. The DDR and PCIe speed ratings are improperly reported, but it's still possible to change the FSB.

Update: I've received a new version that works with ICS9LPR426AGLF support, download 2.0 build18q. The update allows for PCIe overclocking, and the correct speed ratings are reported for CPU/DDR/PCIe/PCI.

Overclock

All benchmarks are performed with this default setup: 2GB PC-4200 533 MHz memory with 3-3-3-9 timing, power from wall-outlet

Overclock 1:

SetFSB 2.0 build 18q, bios 8804:

• CPU frequency: 997.6 MHz / FSB frequency: 221.7 MHz (SetFSB / CPU-Z)
• Bus speed: 110.8 MHz
• PCI-E speed: 99.8 MHz (locked)
• PCI speed: 33.3 MHz (locked)

Overclock 2:

SetFSB 2.0 build 18q, bios 8804:

• CPU frequency: 1101.1 MHz / FSB frequency: 244.7 MHz
• Bus speed: 122.3 MHz
• PCI-E speed: 111.0 MHz
• PCI speed: 33.3 MHz (locked)

Super Pi

CPU 900.1 MHz / PCI-E 100 MHz, bios 8804:

• 1M calculation: 02.15 min / 02.14 min / 02.14 min (3 runs)

CPU 997.6 MHz / PCI-E 100 MHz, bios 8804:

• 1M calculation: 02.05 min / 02.17 min / 02.07 min / 02.09 min (4 runs)

CPU 1101.1 MHz / PCI-E 111 MHz, bios 8804:

• 1M calculation: 01.59 min / 02.06 min / 02.05 min / 02.05 min (4 runs)

3DMark2001 SE

CPU 900.0 MHz / PCI-E 100.0 MHz, bios 8804:

• Defaults, 800x480x16, 3025 / 3001 3DMark points (2 runs)
• Defaults, 800x480x32, 2928 / 2913 3DMark points (2 runs)

CPU 1101.1 MHz / PCI-E 111.0 MHz, bios 8804:

• Defaults, 800x480x16, 3716 / 3730 3DMark points (2 runs)
• Defaults, 800x480x32, 3625 / 3657 3DMark points (2 runs)

SiSoft Sandra Lite 2008

Processor Arthmetic:

CPU 900.1 MHz / FSB 400 MHz, bios 8804:

• Dhrystone: 2584 MIPS
• Wetstone: 2138 MFLOPS

CPU 1101.1 MHz / FSB 488 MHz, bios 8804:

• Dhrystone: 3150 MIPS
• Wetstone: 2609 MFLOPS

Processor Multi-Media:

CPU 900.1 MHz / FSB 400 MHz, bios 8804:

• Int: 8233 iit/s
• Float: 9364 fits/s

CPU 1101.1 MHz / FSB 488 MHz, bios 8804:

• Int: 10069 iit/s
• Float: 11440 fits/s

Memory:

CPU 900.1 MHz / RAM 400 MHz, bios 8804:

• Int: 1900 MB/s
• Float: 1830 MB/s

CPU 1101.1 MHz / RAM 488 MHz, bios 8804:

• Int: 2380 MB/s
• Float: 2380 MB/s

Linux

To get the actual processor speed in linux, the 'p4_clockmod' module has to be unloaded, 'rmmod p4_clockmod'. Get the CPU information by 'cat /proc/cpuinfo' in a terminal window.

The temperature can be found by executing 'cat /proc/acpi/thermal_zone/TZ00/temperature'.

CPU/FSB Speed Limit Workaround

It's possible to run the stock 900 MHz on the latest BIOS version by clearing the CMOS and booting-up. The CPU is not reset to 630 MHz after being prompted to press F2 to load the default settings, allowing to run 900 MHz until the next system reboot.

Clear the CMOS by:

• Flashing the latest BIOS update
• Clear the BIOS settings by shorting the pads

When booting up press F2 to load default settings and continue to load the operating systems on 900 MHz.

Wifi

After installing the new draft-N adapter I haven't had any problems or disconnects that some people are experiencing. On a 802.11g network I transferred files at 2.6 MB/s for an hour without problems.

Battery

Fully charged, display alwasy on, 900 MHz, bios 8804, 2 GB memory, and all internally installed devices powered ON:

• Windows XP idle: 1 hour 42 minutes

Fully charged, display alwasy on, 900 MHz, bios 8804, 2 GB memory, and all internally installed devices powered OFF:

• Windows XP idle: 2 hours 49 minutes

Programs

• HD Tune
• CPU-Z
• 3DMark 2001 SE
• SuperPI
• Powerstrip
• Geekbench
• SetFSB
• MemSet
• Sandra

References

• Overclocking Speed Tests
• Howto Overclock EEE PC