Asus has always given the end users what they are looking for. The A7N266-C is no different. The Bios is full of tweakable settings that allow you to adjust your system to its utmost performance. You have the option of adjusting your setting via the Bios or manually with jumpers. So lets take a look at the Bios.
You have the ability to adjust the CPU multiplier in the Bios. The multiplier settings available in the Bios on the A7N266-C range from 5x up to 12.5x in .5 steps. Of course the XP's multiplier is locked from the factory. If you are running an unlocked T-bird or have taken the time to unlock your XP, these adjustments will be helpful in pushing your system to it's utmost performance level.
The most common performance adjustment used is to push the FSB (Front Side Bus) above the standard 133 Mhz. This can also be easily done in the Bios. Even though you do not have the ability to make adjustments in 1 Mhz increments, Asus has provided you with full range of FSB settings from 100/33 to 172/33. These adjustments allow you to push the CPU and Memory bus speeds to their upper limits while the PCI bus speed stays at the standard 33 Mhz.
Adjustments of memory settings are a bit less than what we have become accustomed to. You have two options to choose from. Your first option is to run the memory via SPD or Manual settings. The system runs SPD by default. The SPD option automatically configures the timing by reading the parameter information stored in the memory module itself. If you choose the Manual option, the Bios gives you a short list of settings to select. These settings consist of Auto(Normal), 2.0T(Normal), 2.5T(Normal), Auto(Turbo), 2.0T(Turbo) and 2.5T(Turbo). The options to adjust the individual settings for the memory's timing are not included.
As far as the rest of the Bios settings, they are the same as every other Bios you have ever adjusted.
Now lets look at the other adjustment available. Asus has included several manual adjustments via jumpers located in various places on the motherboard. Several of these will be utilized for stability while overclocking. The first set of jumpers are the JEN and BSEL jumpers. The JEN jumper tells the motherboard to use either the Bios settings or the manual jumper settings. The two BSEL jumpers allow you to set the CPU Memory frequency ratio. These Jumpers are located above the AGP slot and can be accessed while the video card is installed. Asus has also silk-screened the jumpers setting on the motherboard for each jumper.
So you want to push your system to the edge of its stability and performance? You will need to pump up the juice feeding your processor. To do this Asus has included Voltage Regulator Output Settings. These of course are your VID jumpers. These jumpers allow you to adjust your CPU voltage up to 1.85v. This added voltage is usually what the doctor ordered when pushing your CPU to its limit. These jumpers are located in the bottom right corner of the board above the case connector pins and are easily accessible.
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So at this point we have pushed the FSB, adjusted the CPU supply voltage and know how to change the multiplier in the Bios if necessary. But there is one more adjustment that has always helped me to achieve stability while overclocking. This is the VDDR jumper located just to the right of the memory slots. This jumper allows you to increase the voltage being supplied to the memory of the system. Increasing the memory voltage helps the memory to perform better at the higher FSB settings we run while overclocking. The default setting is 2.6v and can be increased to 2.7v. I know it doesn't look like much but it is enough to help you get that little extra or that stability that just wasn't quite there. Again Asus has silk-screened the settings on the board for easy adjustment.
One thing I did find puzzling was this screening on the board.
This is excellent, a complete list of switch settings for manually adjusting the multiplier. Only one problem, take a look at the picture of the whole board again.
Do you see any dip switches??? Neither do I. Oh well, Asus had a perfect run going. This isn't really a big problem as most of these adjustments are being made in the Bios. Nowadays the Bios adjustments are as stable as the manual settings. So you just pushed your FSB past the posting limit and it looks like you have crapped your Bios. Here is the jumper that has saved more tweakers and overclockers. It's the CLRTC jumper, more commonly known as CMOS clear for most of us. This jumper is located above the VID jumpers.
One last feature included on the A7N266-C is the onboard system indicators. This consists of two LED's of which one is red and the other green. The Green LED, located next to the power connector, indicates that the system power is OK and also lights when the system is in suspend or soft-off mode. The Red LED, located between the AGP and first PCI slot, is a warning indicator and lights when the wrong type AGP card is installed. If the wrong type video card is installed the Red warning LED lights and the system power will not turn on. This is an automatic safety precaution to prevent damage to the motherboard.
That's a look at the A7N266-C motherboard. One of the things our readers have asked is what labels, tags and other markings were on our review board. Below are several pictures showing all labels and other markings from our review sample.
