After some time of negotiation, Silicon Integrated Systems (SiS) announced that it has acquired 533MHz FSB (front-side bus) technology licensing for its Pentium 4 chipsets from Intel. Although the license will secure SiS�s opportunity to keep expanding in the P4 chipset market, the future expansion has inevitably become harder amid intense competition from Intel and VIA Technologies. With improving yield rates, SiS�s sales performance has been significantly boosted by its P4 chipsets. Being the first company to mass-produce P4-based integrated chipsets, SiS has successfully increased its presence in the contract-manufacturing sector, one of Intel�s key markets, with its SiS650. Currently, clients for the company�s SiS650 chipset include Hewlett-Packard (HP) and IBM in the desktop field and HP, NEC and Toshiba in notebooks and Elitegroup Computer Systems (ECS) in motherboards. As for its discrete chipset line, SiS�s sales of SiS645 chipsets have been relatively hampered by Intel�s own 845 series. According to market estimates, SiS shipped around 600,000 SiS650 chipsets in March, but only 200,000 SiS645 chipsets.