For the ASUS A8N-SLI Deluxe and on the asus.com site it reads:
" AI NOS™
Boost performance when you need it the most!
Applications such as 3D games and video editing demand a huge chunk of system resource.
Inject "nitrous oxide" into your CPU! The patented AI NOS™(Non-delay Overclocking System) technology intelligently detects system load and automatically boosts performance for the most demanding tasks. Unlike other dynamic overclocking techniques, AI NOS™reacts much faster to satisfy your unending need for speeds."
How effective is this Non-delay Overclocking System and by how much does it boost performance?
Well my friend nothing comes cheap..... I mean if the RAM is good then you will have a sable overclock by altering FSB through the bios, NOS is just for people who dont know what actual overclocking is ( according to me auto overclocks are just fancy ) the real deal, google 'fsb overclocking through the bios' and you will get wonderfull results or tutes on how to do it.
RAM is the main criteria in overclocking Crucial or better still OCZ will get you more than 2.4 GHZ on your cpu's Dont worry..
might actually just be going for single non-sli board now anyway:
ASUS A8N-VM - Nforce 410 PCI-Express Mainboard - Micro ATX
which doesn't have nos feature but is about £80 cheaper than the deluxe board which will enable me to get better components either memory, processor or graphics card. I'll google for specific instructions on how to o/c through the bios.