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CPU Lock Free

Every user with some experience on computer hardware knows this formula:

CPU operation speed = FSB frequency x CPU multiplier

Users tweak their systems either by increasing FSB frequency or CPU multiplier, which is usually locked for the Pentium 4 CPU when purchased of the shelf, greatly limiting your overclocking options.

Here's the good news for overclockers!! ASUS Motherboards now offer the CPU Lock Free feature, which allows you to adjust CPU multiplier to 14x. The reduction of multiplier value provides more flexibility for increasing external FSB frequency to raise memory bus bandwidth.

The following example demonstrates the effectiveness of CPU Lock Free. As the table indicates, CPU Lock Free adjusted CPU multiplier from 18x to 14x, allowing the system to operate with FSB frequency up to 258MHz(maximum bandwidth 8.23GB/sec) and memory bandwidth up to 10.98GB/sec while CPU operation speed remained at 3.6GHz.

CPU Lock Free boosts overall system performance by making synchronous modification possible. Enjoy better performance at the same CPU operation speed and improve your system without pushing the CPU to the limit.

Example: CPU operation speed fixed at 3.6GHz
(Default setting: 3.6GHz CPU, 200MHz FSB, 18x multiplier, and 533MHz DDR2 memory module)

CPU operation speed

CPU Lock Free function

Multiplier

FSB Frequency

Increased %
of the FSB

Effective Memory Frequency

Memory Bandwidth

3.6GHz

Yes

14x

258MHz

29%

686MHz

10.98GB/sec

No

18x

200MHz

0%

533MHz

8.6GB/sec

Testing Configuration:
- Motherboard: ASUS P5AD2 Premium, BIOS Version: 1007
- CPU: Intel LGA775 3.6GHz
- DRAM: Micron DDR2 533, 256MB*2PCS
- Graphics Card: ASUS EAX800XT
- O.S: Windows XP Professional version 5.1. 2600+ Service Pack 2

Test Result:
Table 1: performance increased by 23% in SiSoft Sandra 2004

Table 2: performance increased by 7.8% in PC Mark 2004

Motherboards supporting CPU Lock Free

P5 Series (LGA 775 Socket) BIOS Version P4 Series (Socket 478) BIOS Version

P5 AD2 Premium

1.007

P4C800-E Deluxe

Coming soon

P5 AD2 Deluxe

1.004

P4P800-E Deluxe

Coming soon

P5GD2 Premium

1.006

P4P800 SE

Coming soon

P5GD2 Deluxe

1.004

P4P800-X

Coming soon

P5GD2 Pro

1.005

P4GD1

Coming soon

P5GD2

1.003

   

P5GD1

1.005

   

P5GD1 Pro

1.003

   

P5GDC Deluxe

1.004

   

P5GDC-V Deluxe

1.004

   

P5P800

Coming soon

   

CPU compatible with CPU Lock Free
Prescott LGA775 CPU (Performance/04B)

800MHZ FSB, 3.4GHz, 3.6GHz, 3.8GHz, 4.0GHz+

Prescott Socket 478 CPU (FMB1.5)
800MHZ FSB, 3.2GHz, 3.4GHz+


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