Chapter 4 Notes

Question 1

What five clock speeds were commonly used on the early DRAM system?

Answer 1

66, 75, 83, 100 and 133 MHz

They all had the prefix “PC”

So the clock speeds were PC66-PC133

Question 2

DDR SDRAM on laptops

Answer 2

Come in either 200-pin SO-DIMMs or 172-pin micro-DIMMs

Question 3

DDR3

Answer 3

30 percent lower power consumption than DRR2 RAM

Uses 240 pin DIMM

DDR3 SO-DIMM for portable computers have 204 pins

Question 4

DDRs and their pins

Answer 4

DDR4 uses 288pin DIMM

DDR4 SO-DIMMs have 260 pins

DDR3 204 pin SO-DIMM

DDR5 DIMMs have 288pins

Question 5

Latency explained

Answer 5

If two types of ram have the same speed rating, RAM with lower latency (such as CL17) is slightly faster than RAM with higher latency (such as CL19) bc it responds faster.

CL = clock cycle delays

17 = memory delays 17 clock cycles before delivering the requested data.

Question 6

What’s are the key stokes to get to the task manager?

Answer 6

Ctrl-shift -esc