Intel will continue to work with Microsoft on writing Windows to the Intel architecture, Eden said. Intel is also improving its low-power Atom processor to put pressure on Arm in the smartphone and tablet space.

Texas Instruments and Qualcomm said they are collaborating with Microsoft on Windows for Arm but currently are keeping their focus on mobile computing. The companies didn't comment on whether they aspired to the PC market, other than saying that Windows on Arm could open up new opportunities for them.

Texas Instruments currently offers OMAP chips, which are based on the Arm design and primarily are used in smartphones and tablets.

"As of today, TI remains on focused on mobile computing opportunities, for which the OMAP platform is well positioned," said Heather Ailara, a Texas Instruments spokeswoman.

PC makers, caught in the middle of the architecture battle, are waiting and watching how the situation pans out.