In computing, Haswell was a 2013 CPU microarchitecture developed by Intel. Haswell supports the x86 instruction set, and specifically, its 64-bit variant, the x86-64. As the tock part of the company's Tick–tock production model, Haswell inherited the same 22 nm FinFET manufacturing process with its predecessor, Ivy Bridge, and mainly focused on architectural improvements. Products based on Haswell were marketed as the 4th generation Core, v3-suffixed Xeon processors, and various other models of Pentium and Celeron. The earliest demonstration of Haswell-based chips took place at the 2011 Intel Developer Forum, with products officially announced on June 4, 2013, at that year's Computex Taipei. Commercial sales began for manufacturers and OEMs in mid-2013, and standalone desktop chips in September 2013. Haswell CPUs are compatible with motherboards using Intel series 8, 9, C220 and C610 chipsets.