with a clock rate of 93.75 mhz, the n64's vr4300 is generally considered to be the most powerful console cpu of the fifth generation of video game consoles. except for its narrower 32-bit system bus, the vr4300 retains the computational abilities of the 64-bit mips r4200, though few titles take advantage of 64-bit data precision operations. n64 game titles generally use faster and more compact 32-bit data-operations, as these are sufficient to generate 3d scene data for the console's rsp (reality signal processor) unit. in addition, 32-bit code executes faster and requires less storage space, which came at a premium with contemporary technology. the cpu is constrained by a 562.5 mb/s bus to the system ram, and in order to access the ram, the cpu must go through the reality coprocessor (rcp), and can not use dma to do so as the rcp can. this issue is further compounded by the rdram's high access latency.