RAM Types

Question 1

Virtual RAM

Answer 1

Memory space on a hard drive that can be allocated when additional memory is needed. Also known as a swap file or paging file

Question 2

Small Outline Dual Inline Memory Module
(SODIMM)

Answer 2

Pin configurations:
100-, 144-, 200-, 204-, 260-
Used in laptops

Question 3

Double Data Rate 3
(DDR3)

Answer 3

240-pin DIMM
204-pin SODIMM
30% less power consumption that DDR2

Question 4

Double Data Rate 4
(DDR4)

Answer 4

288-pin DIMM
260-pin SODIMM

Question 5

Error-Correcting Code (ECC) RAM

Answer 5

Detects and corrects memory errors
Parity bit can correct a byte with sinlge-bit errors

Question 6

What memory chips would you find on a stick of PC3‐16000?

Answer 6

DDR3-2000
Remember the 8:1 rule. Modules greater than but not including SDR SDRAM are named with a number eight times larger than the number used to name the chips on the module. The initials PC are used to describe the module; the initials DDR are used for the chips; and a single‐digit number after PC and DDR is used to represent the level of DDR. The lack of a single‐digit number represents DDR as long as the number that is present is greater than 133 (such as PC1600). Otherwise, you’re dealing with SDR (such as PC133). This means that PC3‐16000 modules are DDR3 modules and are populated with chips named DDR3 and a number that is one‐eighth of the module’s numeric code: 2000.