What is cpu io and cpu sa?
What is cpu io and cpu sa?
VCCIO refers to the ring voltage, utilized by the CPU cache and memory controllers. VCCSA denotes the voltage supplied by the PCIe controller along with other components.
•VCCSA: Beginning with the second-gen Core i chips ("Sandy Bridge"), the VTT voltage was rebranded as VCCSA and referred to as the "system agent." It supplies the integrated PCI Express controller, memory controller, and display engine (the "2D" component of the graphics processor).
•VCCIO: Beginning with the second-gen Core i CPUs ("Sandy Bridge"), this voltage powers all input/output pins except those related to memory. On processors using this voltage, it also feeds the thermal control bus (PECI, Platform Environmental Control Interface).
VCCS can influence a PCIe M.2 SSD regardless of whether it connects to the CPU or the chipset.
This impacts the voltage of the components inside the CPU, not the connected devices. When XMP is turned on, RAM modules receive increased voltage (such as 1.35V) to support higher clock speeds, and the memory controller also gets more power (like 1.2V) to handle those speeds. This adjustment doesn't mean the controller directly powers the RAM chip itself.