RAM types

Question 1

DRAM

Answer 1

Dynamic RAM. Older tech, not used in modern computers.

Question 2

FPM

Answer 2

Fast Page Mode. The CPU send a row address, followed by a column address.

Question 3

VRAM

Answer 3

Video RAM. A modified version of FPM. VRAM has two ports, one port can be read to refresh the image on the screen while the other can be used to generate the next image to be displayed.

Question 4

EDO

Answer 4

Extended Data Out. Works essentially like FPM, except that a new cell access request can begin before a previous request has finished.

Question 5

BEDO

Answer 5

Burst Extended Data Out. Adds pipelining technology to EDO to improve performance. This technology never caught on.

Question 6

SDR RAM

Answer 6

Synchronous RAM. Is synchronized with the system clock to improve performance. Internal interleaving enables overlapped accesses, as with
EDO and BEDO.

Question 7

DRDRAM

Answer 7

Direct Rambus RAM. Uses a 16-bit data bus running at up to 800 MHz, transferring data on both the rise and fall of the clock signal.

Question 8

DDR SDRAM

Answer 8

Double Data Rate SDRAM. Doubles the transfer rate by transferring data on both the rise and the fall of the clock. (Compared to SDRAM, which transfers on just the rise.)

Question 9

DDR2 SDRAM

Answer 9

Double Data Rate 2. Doubles the transfer rate of DDR SDRAM by placing twice as much data on the rising edge and twice as much on the falling edge.

Question 10

DDR3 SDRAM

Answer 10

Double Data Rate 3. Doubles the transfer rate of DDR2 SDRAM.