RAM slots

Question 1

What are the pin sizes for SDRAM for desktops?

Answer 1

168 pin DIMM

Question 2

What are the SDRAM pin sizes for laptops?

Answer 2

68 & 144 172 pin micro-DIMMs and 72, 144 or 200 pin Small Outline DIMM (SO-DIMM) All are 64 bits wide, except for the 72 pin 32 bit SO-DIMM

Question 3

What are the pin sizes for RDRAM?

Answer 3

184 pin for desktops and 160 pin for laptops

Question 4

What is a CRIMM?

Answer 4

Continuity RIMM, a device that terminates an empty RDRAM slot

Question 5

What are the pin sizes for DDR SDRAM?

Answer 5

184 pin for desktops, 200 pin SO-DIMMs and 172 pin micro-DIMMs

Question 6

Pin sizes for DDR2 SDRAM?

Answer 6

240 pin for desktops, 200 pin SO-DIMMs

Question 7

Pin sizes for DDR3?

Answer 7

240 pin for desktops, 204 pin SO-DIMMS

Question 7

What is a DIMM?

Answer 7

Dual inline memory module

Question 8

What is parity RAM?

Answer 8

It was the first type of error correcting RAM, it used an additional bit to try to detect any RAM errors. It couldn’t detect all errors and could only tell the MCC that there was an error, not what the error was

Question 9

What is ECC RAM?

Answer 9

It’s improved version of parity, it uses special code to detect when a bit is incorrect and fixes it on the fly. It needs a special MB to run properly.

Question 10

How does ECC RAM differ from parity RAM.?

Answer 10

Parity can’t fix the errors, and it doesn’t always detect every error.

Question 11

What’s the difference between double and single sided RAM?

Answer 11

Single sided (vast majority is single sided) has RAM chips on one side of the chip. Not all MBs support double sided RAM or sometimes they must be used in specific ways. Check your manual.

Question 12

What is single vs double vs triple channel memory?

Answer 12

Dual channel RAM the CPU addresses each stick alternately by adding another communication channel to the RAM, triple channel increases the amount to three in a row, which theoretically doubles or triples the data transfer rate.

Question 13

What is the DDR speed rating and PC speed rating on a stick of 100 MHz DDR SDRAM?

Answer 13

DRR200 and PC1600’ simply multiply the clock speed by two for the DDR, PC speed is the data throughput, which is the clock speed multiplied by 8 bytes, multiplied by the data rate. So, 100, x 8 x 2= pc1600

Question 14

What is the DDR I/O speed, DDR2 speed rating and PC speed rating for 100 MHz DDR2 RAM?

Answer 14

DDR2 RAM doubled the I/O speed, so it would be 200 MHz, since it is double data rate, the DDR2 speed rating is DDR2-400’ and the PC speed rating is DDR2 speed rating x 8, so PC3200

Question 15

What is the buffer of DDR3 RAM?

Answer 15

8 bits, up from 4 bits in DDR2.

Question 16

What is the DDR I/O speed, DDR3 speed rating and PC speed rating of 100 MHz DDR3 RAM?

Answer 16

DDR I/O speed quadruples the clock speed, the DDR3 speed rating is double the DDR I/O rating, so DDR3-800 and 8 times the speed rating gives you PC-6400.