Intel, AMD and VIA are all being sued by Acacia subsidiary, Computer Cache Coherence Corp., in a case centring on patented cache memory coherence techniques which are owned by Acacia and have been said to have been incorporated in technology created by Intel, AMD and VIA. This technology is used to permit different memories to communicate and synchronise with each other, say by synchronising main memory and main cache memory, to produce a performance boost. Intel is currently already being sued by another of Acacia's subsidiaries, and is in fact working in a partnership with yet another. The chip maker continues to claim that the Acacia suit has no foundation.