MEMORY

1. Paging system/Virtual Memory

2. Synchronous DRAM

2.1. -synchronzed to the bus -for upgrading the speed of memory -the unit is MB/sec

3. Memory that checks itself

3.1. eg: database server Pavity memory

3.1.1. -allow memory to detect error and flag it to tell the CPU not to run it. -cannit fix the error

3.2. eg: database server Error Correcting Code(ECC)

3.2.1. -detects error and fix it -run

4. Multi Channel Memory

4.1. -memory combination should match -memory module slots are often coloured

4.1.1. Single sided memory -one rank/sides/row

4.1.2. Double sided memory -two ranks/sides/rows

5. Memory Latency -CAS(Column Address Strobe/Select -CAS Latency (CL)

5.1. the lower the CL number, the lower the clock cycle thus increase the data transfer.

6. Northbridge (Memory Controller Hub) -control / manage CPU

7. CPU

7.1. CPU Registers -store information -Just enough information to operate only

8. Caches

8.1. -L1, L2, L3 -from Static RAM

9. Dynamic RAM

10. Memory Transfer

10.1. Bandwidth -bytes transferes with each clock cycle -represented as 8, 16, 32, 64 bits