Overclocking Features and Results
ASUS and Overclocking - this is something that when said together just sounds right. ASUS has put so much of its R&D time into getting the most out of their boards as possible. This time though, ASUS has a rather bleak looking overclocking setup. However, since the ASUS N4L-VM DH motherboard is designed for HTPC users, we aren't too surprised or shocked.
To find what overclocking features are available you need to first visit the Jumperfree sub-menu under the Advanced Tab. While it does say A.I Overclocking in the menu, there are only 2 options, Auto and Manual. ASUS has not included any of its automatic overclocking profiles like it has done in the past. When you choose manual, you get 3 additional options.
First is FSB Frequency. Set at a default of 166MHz (667QDR) you can adjust this from 100MHz up to 500MHz in 1MHz increments. This is a bold amount of selection; however, without any vCore, PCI-E clock locks or other tweaks, you aren't going to get very far.
Next is the CPU Spread Spectrum. While this is supposed to lower EMI interference, changing this did nothing to increase or decrease overclocking results.
Lastly is the DDR2 Reference voltage. This can be changed from default of 1.8v up to 2.0v in 0.1v increments. In all, it is a very sad sight when it comes to overclocking. Hopefully ASUS will update its BIOS to include vCore adjustments and all the other little bits we come to love from ASUS motherboards.
With these limiting settings we only managed a maximum speed of 2.21GHz out of our 2GHz Core Duo processor.