Question about Compaq Presario SR1120NX 2.66GHZ Tower w/ CD-RW (2018267632) PC Desktop

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Few questions about RAM memory?

What is the difference between high density and low densty RAM?
2) How can i check speed of computer when i incresed RAM? can i use CPU-Z for this. Does high DRAM frequency means more faster speed?
3) My computer has one 4 slots each can go with 1 GB PC3200 RAM with maximum capacity of 4 GB. My computer has 2 slots in black color and 2 slots in black color. What is the difference between these 2 colors slots.
4) Are 1 sided RAM is compatible with 2 Sided or double density RAM or if i rephrase does 8chip PC3200 DDR400 is compatible with 16chips PC3200 DDR400

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i)  LOW DENSITY modules have 100% compatiility with ALL systems and ALL chipsets.
    HIGH DENSITY modules only have 10% compatibility

    here compatablity means LOW DENSITY RAM are accepted by all system(100%)  or any make           system.. HIGH DENSITY RAM are accepted by 10% by only some system or computers...


ii) in order to check system performance or amount of Computer RAM usage press the ctrl+alt+del
   simultaneously a new window(window task manager) will appear showing:

    CPU usage: showing the amount of CPU or processor utilized at that particular time.
    PF usage: showing the amount of RAM memory utilized at that particular time.
    Physical Memory: showing Total RAM Memory, Available Ram memory....

iii) baiscally they are two types of RAM they are:

    DDR1:which is older one supported by older system  or older mother boards which is costlier
    DDR2: which is latest one supported by all new system or new mother boards which is less                         costlier

    DDR: double data rated ram......which will send data at a double rate compared to SD RAM

iii) here color doesnt matter, these slots either support DDR1 or DDR2 but not both at a time
    
    DDR1 has 184 pins or gold plated pinssss... on the edge of the RAM
    DDR2 has 240 pins 

    so difference doesnot allow DDR2 to placed in DDR1 motherboards or vice versa...

iv) it does have anything to do with no of chips on the RAM but they only differ whether it is DDR1 OR DDR 2(DDR2 are much faster than DDR1)

NOTE: whatever may the the RAM, each RAM has FSB(called Frequency...) which determines the frequency of rate at which data is tranferred from RAM to processor(CPU)  usually in MHZ such as FSB 300, 400, 200 , 333...................

more the FSB the faster data is transferred to the processor(CPU)

dont worry even RAM with less FSB's work well with the processor....having 1 GB RAM or 2 GB RAM is engouh, it only matters with the speed of CPU ... but not RAM......
    

    
                                         

Posted on Dec 28, 2008

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Not supporting ram of 2gb DDR3 in acer motherboard N15235


You first need to ensure you have memory that is compatible with the motherboard. If you have high density memory instead of low density that could be the problem because a limited number of motherboards recognise high density memory.

I suggest you check with the motherboard manual.

If you are certain you have compatible memory I suggest you clean the terminals of the chips and blow any dust from the receptacles and work the chips in and out of the receptacles several times, taking suitable precautions against static discharge at all times.
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The 2 1Gb RAM are either the wrong type or they are incompatible.
Try to use the same brand and speed as the 256 Mb RAM that was installed in your Dell.

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Can I put different types of RAM on a motherboard?


Not different types per se, but you may be able to put different speeds.

Type would be like DDR Sdram2_bing.gif, or DDR2 Sdram for example.

Speed is a slang term for Frequency Rate. What frequency rate does the ram memory2_bing.gif module (Stick) operate at.

Example: DDR2 Sdram that has a frequency rate of 667MHz. (PC2-5300) MHz stands for MegaHertz.

Mega = approximately 1 Million. Hertz stands for Cycles per Second.

The above ram memory module operates at 667 Million Cycles per Second.

If you install two ram modules that have a different frequency rate, all the ram memory installed will operate at the slower frequency rate.

(Provided the computer will support more than just one frequency rate)

Have a computer in mind, or is this just a generic question? A what if?


Reply to your recent comment:

If this is in relation to two different manufactures of your ram memory, it shouldn't be a problem.

Where you may get into trouble in this area, is if one ram memory module (Stick) is generic, or low budget, and one ram memory module is a high performance gamer ram memory.

Without knowing the exact manufacturer of your computer, plus the Model name of it, and also knowing the information you have about your ram memory 'sticks', the following information is just generic, or general information.

High performance ram memory may use a higher voltage. Not always, but a good portion of the time.

High performance ram may also use a faster set of ram timings.
It may also have high density DRAM chips, and the chip configuration may be setup differently.

(The black rectangular modules you see on the side of a ram memory 'stick', are DRAM chips)

To explain so far;

SDR Sdram was the typical ram memory for years after SIMM ram memory.
SDR stands for Single Data rate.
Commonly just referred to as Sdram, but in actuality that is erroneous.

(Sdram stands for Synchronous Dynamic Random Access Memory)

Then came DDR Sdram.
Double Data Rate Sdram.
Then DDR2 SDram.
Double Data Rate 2 Sdram.
Then DDR3 Sdram.
Double Data Rate 3 Sdram.

1) http://en.wikipedia.org/wiki/SDRAM

(Anything you see on a Wikipedia page that is in blue, is a link to more information.

To further illustrate this,

2) http://en.wikipedia.org/wiki/DDR_SDRAM )

SDR Sdram specifications were all over the place. What was considered to be a standard for one manufacturer, differed for another manufacturer.

The JEDEC organization was formed.
JEDEC sets the standards for ram memory from DDR Sdram on up.

Voltage for DDR Sdram is 2.5 volts
DDR2 is 1.8 Volts
DDR3 is 1.5 Volts.

Ram manufacturers found that by upping the voltage requirement on high performance ram, the ram could perform, better.
Not true in all cases, as there is high performance ram that operates at the JEDEC standard.

Ram timings were also varied.
Also the chip configuration
Plus the density of the DRAM chip.

Unless it is a really cheap, generic ram module, (Stick), there will be a manufacturers code on the side.
With this code I can tell you the specifications of that ram module.
I can also explain

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RAM compatibilty


No, DDR 400 will not work. The best thing you can do is call Dell and give them your information. Model number and that kind of information and let them tell you what kind of ram you need. If you put the wrong type of ram in your machine it could cause major damage. There are so many different kinds of memory out there, not to mention high and low denisity. Your machine may use PC2700 high density and if you try to use PC2700 low density it will not work. One other thing that you can try is uninstall a stick of your ram and write down everything on the stickers and then go to some place like kingston memory and use their memory locator to find what you need.

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Not getting full 2 gb ram from 2 x 1 gb cards


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If you have a video card in and expansion slot with it's OWN memory on the card , then it will not use the systems' memory.
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Apr 06, 2009 | Computers & Internet

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I tryed to restore my emachine w1800 with my restore disk and when I reboot a blue screen comes up a problem has been detected and windows has been shut down to prevent damage to your computer. If this is...


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hi

i needs to the rams are in same speed. if it not you put a rams in same speed

next you need to study your motherboard manual it supports the ram speed.if ever this is ok. then your ram will be faulty

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