Chapter 4 starting at page 141 Flashcards
Rambus DRAM, called RDRAM, was manufactured to handle speeds up to ______.
a. 200 MHz
b. 400 MHz
c. 600 MHz
d. 800 MHz
d. 800 MHz
How was the 400MHz frontside bus made possible?
By making CPUs and MCCs capable of sending 64 bits of data two or four times for every clock cycle, efectively doubling or quadrupling the system bus speed.
RDRAM was held up by delays in development and cost. Therefore only one or two PC makers provided for RDRAM to be used on their computers. True or False
False. Almost all PC makers provided for the use of RDRAM, although it was not supported for long due to the cost.
DDR SDRAM stands for what?
Double Data Rate SDRAM, and was supported as an alternative to RDRAM.
The double data rate supplied by DDR SDRAM was accomplished how?
by doubling the throughput of SDRAM by making two processes for every clock cycle.
DDR SDRAM for desktops comes in 184 pin DIMMs. How do they differ from the 184 pin DIMMs for SDRAM?
the pin compatibility and the guide notches are different, so you cannot insert either type of RAM into the other’s slot.
DDR SDRAM for laptops comes in _____pin SODIMMS or ____ pin mico-DIMMS.
a. 150, 172
b. 184, 200
c. 200, 172
c. 200, 172
DDR sticks use a naming convention based on the number of bytes per second of data throughput the RAM can handle. How do you determine the bytes per second?
Take the MHz speed and multiply by 8 bytes, the width of all DDR SDRAM sticks.
If the spped is 400 MHz , what is the correct term for that DDR SDRAM speed?
400 MHz x 8 is 3200, with the PC in front makes PC3200
Techs also use a naming convention for individual DDR chips. What does DDR400 mean?
refers to a 400 MHz DDR SDRAM chip running on a 200 MHz clock.
Using the naming convention for DDR SDRAM, fill in the blanks for the information not given:
a. DDR speed 200, PC-_______________
b. clock speed 200MHZ, PC- 3200, DDR _______
c. clock speed 300 MHz, DDR speed ______, PC-____
a. PC-1600
b. DDR 400
c. DDR 600, PC-4800
What is dual-channel architecture? What does it require?
using two sticks of RDRAM togerher to incrase throughput. It requires two identical sticks of DDR and they must snap into two paired slots. Many motherboards offer four slots.
What is the advantage of DDR2?
runs faster than DDR while using less power.
How does the DDR2 run faster?
by clock doubling the input/output circuits on the chips.
This does not speed up the core RAM, but by speeding up the input/output and adding special buffers (like cache) makes it run much faster.
DDR2 uses a ______pin DIMM, which is/is not compatible with DDR,and the DDR2 _____ pin SODIMM is/is not compatible with the DDR SODIMM.
240, isnot, 200, is not
