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Figure 417
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An nForce motherboard showing the three RAM slots The two slots bracketing the slim space can run as dual channel as long as you don t populate the third slot
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4: RAM
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If you populate the third slot, the system will use the full capacity of RAM installed, but turns off the dual-channel feature and no, it doesn t tell you! The dual slots are blue; the third slot is black, which you could clearly see if this weren t a black-and-white photo
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The fastest versions of DDR SDRAM run at a blistering PC4800 That s 48 gigabytes per second (GBps) of data throughput! You d think that kind of speed would satisfy most users, and to be honest, DRAM running at approximately 5 GBps really is plenty fast for now However, the ongoing speed increases ensure that even these speeds won t be good enough in the future Knowing this, the RAM industry came out with DDR2, the successor to DDR DDR2 SDRAM is DDR RAM with some improvements in its electrical characteristics, enabling it to run even faster than DDR while using less power The big speed increase from DDR2 comes by clock doubling the input/output circuits on the chips This does not speed up the core RAM the part that holds the data but speeding up the input/output and adding special buffers (sort of like a cache) makes DDR2 run much faster than regular DDR DDR2 uses a 240-pin DIMM that s not compatible with DDR You ll find motherboards running both single-channel and dual-channel DDR2 (Figure 418) The following table shows some of the common DDR2 speeds DDR I/O Speed
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200 MHz 266 MHz 333 MHz 400 MHz 500 MHz
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100 MHz 133 MHz 166 MHz 200 MHz 250 MHz
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DDR2-400 DDR2-533 DDR2-667 DDR2-800 DDR2-1000
PC Speed Rating
PC2-3200 PC2-4200 PC2-5300 PC2-6400 PC2-8000
RAM Variations
Within each class of RAM, you ll find variations in packaging, speed, quality, and the capability to handle data with more or fewer errors Higher-end systems often need higher-end RAM, so knowing these variations is of crucial importance to techs
Double-Sided DIMMs
Every type of RAM stick, starting with the old FPM SIMMs and continuing through to 240-pin DDR2 SDRAM, comes in one of two types: single-sided and double-sided As their name implies, single-sided RAM sticks only have chips on one side of the stick Double-sided RAM
Figure 418
240-pin DDR2 DIMM
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sticks have chips on both sides (Figure 419) The vast majority of RAM sticks are single-sided, but there are plenty of double-sided sticks out there Double-sided sticks are basically two sticks of RAM soldered onto one board There s nothing wrong with double-sided RAM other than the fact that some motherboards either can t use them or can only use them in certain ways for example, only if you use a single stick and it goes into a certain slot
Latency
If you ve shopped for RAM lately, you may have noticed terms such as CL2 or low latency as you tried to determine which RAM to purchase You might find two otherwise identical RAM sticks with a 20 per Figure 419 Double-sided DDR SDRAM cent price difference and a salesperson pressuring you to buy the more expensive one because it s faster even though both sticks say DDR400 (Figure 420) Tech Tip RAM responds to electrical signals at varying rates When the memory Latency Is Relative controller starts to grab a line of memory, for example, there s a slight delay; Latency numbers reflect how think of it as the RAM getting off the couch After the RAM sends out the remany clicks of the system clock it quested line of memory, there s another slight delay before the memory takes before the RAM responds If controller can ask for another line the RAM sat back down The delay in you speed up the system clock, RAM s response time is called its latency RAM with a lower latency such say from 166 MHz to 200 MHz, as CL2 is faster than RAM with a higher latency such as CL3 because it the same stick of RAM might take responds more quickly an extra click before it can reFrom a tech s standpoint, you need to get the proper RAM for the system spond When you take RAM out on which you re working If you put a high latency stick in a motherboard of an older system and put it into set up for a low latency stick, you ll get an unstable or completely dead PC a newer one, you might get a Check the motherboard manual and get the quickest RAM the motherboard seemingly dead PC, even though the RAM fits in the DIMM slot can handle and you should be fine
Many motherboards enable you to adjust the RAM timings manually If so, try raising the latency to give the slower RAM time to respond See 5, BIOS and CMOS, to learn how to make these adjustments (and how to recover if you make a mistake!)
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