Even among Atom-based systems which have Intel 64 enabled, not all are able to run 64-bit versions of Microsoft Windows. For those Pineview processors which support 64-bit operation, Intel Download Center currently provides 64-bit Windows 7 and Windows Vista drivers for Intel GMA 3150 graphics, found in Pineview processors.[28] However, no 64-bit Windows drivers are available for Intel Atom Cedarview processors, released Q3 2011.[29] However, Intel's Bay Trail-M processors, built on the Silvermont microarchitecture and released in the second half of 2013, regain 64-bit support, although driver support for Linux and Windows 7 is limited at launch.[30]
 
The lack of 64-bit Windows support for Cedarview processors appears to be due to a driver issue. A member of the Intel Enthusiast Team has stated in a series of posts on enthusiast site Tom's Hardware that while the Atom D2700 (Cedarview) was designed with Intel 64 support, due to a "limitation of the board" Intel had pulled their previously-available 64-bit drivers for Windows 7 and would not provide any further 64-bit support.[31] Some system manufacturers have similarly stated that their motherboards with Atom Cedarview processors lack 64-bit support due to a "lack of Intel® 64-bit VGA driver support".[32] Because all Cedarview processors use the same Intel GMA 3600 or 3650 graphics as the D2700, this indicates that Atom Cedarview systems will remain unable to run 64-bit versions of Windows, even those which have Intel 64 enabled and are able to run 64-bit versions of Linux.