In personal computers, the Front Side Bus (FSB) is the bus that carries data between the CPU and the Northbridge. Depending on the processor used, some computers may also have a back side bus that connects the CPU to the cache. This bus and the cache connected to it are faster than accessing the system memory via the front side bus. The number of transfers per clock cycle is dependent on the technology used. For example, GTL+ performs 1 transfer/cycle, EV6 2 transfers/cycle, and AGTL+ 4 transfers/cycle. Intel calls the technique of four transfers per cycle Quad Pumping.