Most netbooks and other ultra-mobile PCs currently run on Intel’s Atom x86 chips, but according to Analytics firm ABI, they shouldn’t get too used to being on top. In a new report, ABI is claiming that ARM-based chips will overtake Intel by 2013. ARM has been pushing for the opportunity to power non-smartphone devices for some time now. In October they introduced the Cortex A5 MP architecture, which they claim can efficiently power a netbook style device.

Intel is not currently sweating bullets, but they may be gearing up for a fight. Intel has established an Atom developer program to push the platform further. The chip maker has also unveiled plans to sell a version of the Atom intended for smartphones called the Moorestown. This is a direct challenge to ARM on their home turf.

The dominance of ARM is far from a sure thing, though. Rival analytics firm IDC has stated that ARM-based netbooks are unlikely to capture more than 10-20% of the market. They cited manufacturers’ tight relationships with Intel. Also, Windows does not currently support ARM chips. Since Windows is the dominant platform even on netbooks, the future for ARM netbooks is still hazy. If Linux netbooks took off, as Robert Castellano of The Information Network predicted last year, ARM would definitely have an in. Linux just needs to have its year. Hey, it could happen.