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Title: CompTIA A+ - RAM
Description: CompTIA A+ certification notes. These notes also work for any general electrical engineering / computer science course.
Description: CompTIA A+ certification notes. These notes also work for any general electrical engineering / computer science course.
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RAM and RAM Speeds
Tuesday, March 22, 2016
9:05 AM
• RAM is the temporary storage for data on your system
• Data is saved on your Hard Drive, and when it is being used it is moved to RAM where the
processor then processes it, and then puts it back to the RAM and then to the Hard Drive when
the data is ready to be stored
...
Every Bit of DRAM is stored with a resistor
and a capacitor
...
( x 1 Clock
Multiplier )
• SDRAM worked great but eventually it wasn't fast enough due to it being synced with the system
clock
...
• DDR SDRAM has 1 notch; Worked by doubling the system clock speed
...
The PC speed is DDR speed x 8
...
6 GHz )
• DDR was then replaced by DDR2
...
• DDR2 was then replaced by DDR3
• DDR3 is modern today; Has 240 Pin DIMM; Has 1 notch in slightly different spot from older
versions
...
• PC3 DDR3 Speed: ( ( ( 100 MHz x 4 ) x 2 ) x 8 = PC3 6400 MHz )
PC speed is different from DDR speed:
• DDR speed is the system clock x 2
• DDR2 speed is the system clock x 4
• DDR3 speed is the system clock x 8
• PC speed is DDR x 8
• PC2 speed is DDR2 x 8
• PC3 speed is DDR3 x 8
You need to able to know the speed of the system clock and DDRx converted values
...
RAM Page 2
Other Types of RAM
Thursday, March 24, 2016
9:46 AM
• There are "weird" types of RAM; Old and complicated
...
WHEN INSTALLING RAM, DO NOT TOUCH METAL PARTS OR CHIPS
...
Installing:
• Grab RAM sticks by sides
• Pull down tabs on channels
• Place RAM stick in channel, lining RAM notch with channel notch
• Apply pressure with palm
Signs of error:
• Computer does not boot up
...
RAM Page 4
Troubleshooting RAM
Monday, March 28, 2016
8:03 AM
Steps to troubleshooting:
1
...
2
...
If it is detected that your memory is bad, you have to use process of elimination to figure out the
bad sticks
...
Using too much of your memory will cause your system to say "out of memory"
Your system can use a swap file that acts like virtual memory
...
RAM Page 6
Title: CompTIA A+ - RAM
Description: CompTIA A+ certification notes. These notes also work for any general electrical engineering / computer science course.
Description: CompTIA A+ certification notes. These notes also work for any general electrical engineering / computer science course.