youtube tuesday. ram overview in this chapter, you will learn how to –identify the different types...
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YouTube Tuesday
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RAM
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Overview
• In this chapter, you will learn how to– Identify the different types of RAM packaging– Explain the varieties of DRAM– Install RAM properly
– http://youtu.be/52O-KfPgoNo
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DRAM
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Program Execution
• Program code is copied from your hard disk into RAM before it is executed…
• http://youtu.be/Ye6W6mMSPl0
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DRAM
• DRAM (Dynamic Random Access Memory) is the most popular type of electronic memory– Special type of
semiconductor that stores individual 1’s
and 0’s using microscopic capacitors and transistors
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Organizing DRAM
• DRAM is considered as the standard RAM due to its low cost, high speed, and ability to store data in a relatively small package
• The RAM stores programs and data in 8-bit (1-byte) chunks of memory
• DRAM chips are always referenced with respect to their depth and width– 1 Meg x 4– 256 K x 1
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Organizing DRAM
• The depth and width are measured in units of bits
• They can only be differentiated using the information printed on the chip itself
• The physical size and the internal organization of the chip are not directly correlated
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RAM Sticks
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DIMM (Dual Inline Memory Module)
• The 168-pin DIMM is the most popular DRAM package in use today– Extra pins to handle functions such as buffering
and ECC– 144-pin SO-DIMMs (Small Outline) are used in
laptops
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SDRAM
• SDRAM (Synchronous Dynamic Random Access RAM) are tied to the system clocks– Faster than DRAMs– Only available on DIMMs– Use clock speed instead of access speed– SDRAM is always a DIMM, but a DIMM isn’t
always SDRAM
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RDRAM
• RDRAM (Rambus DRAM) is a new type of RAM – Speeds of up to 800 MHz– Comes on sticks called RIMMs– 184-pin for desktops and 160-pin SO-RIMM for
laptops
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DDR SDRAM (Double Data Rate)
• DDR SDRAM (Double Data Rate SDRAM) doubles the throughput of SDRAM– 184-pin DIMM packages– Speed of 200 or 266 MH.– Used in lower-end systems
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Dual-Channel Architecture
• Dual-channel architectures use two sticks of RAM together to increase throughput
• Double-sided SIMMs/DIMMs– Double-side sticks have chips on both sides
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Do You Need RAM?
• Two symptoms point to needing more RAM– General system sluggishness– Disk thrashing or excessive hard drive accessing
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Installing DIMMs
• Swing the side tabs away from upright• Push the DIMM down somewhat hard –
the two tabs should move back into place
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Check the RAM
• A halt before the RAM check could indicate improperly installed RAM