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Tom's Hardware > Forum > Motherboards & Memory > Memory > MEMORY FAQ (please read before posting)

MEMORY FAQ (please read before posting) - Page 2

Forum Motherboards & Memory : Memory MEMORY FAQ (please read before posting)MEMORY FAQ (please read before posting)

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Correction needed:

BrentUnitedMem wrote :

Memory module bank: Logical division of chips on a PCB board. A single memory bank can be composed of any number of chips. Some banks are composed of only 2 chips, whereas some other modules have 18 chips or more per bank. Not to be confused with memory Rank, see next term.
Memory rank: The physical side of a memory module. The side of the module is referred to by Rank0 or Rank1.


Actually, DIMM rank is a logical 64-bit memory side (chip-select), synonymous with one 64-bit memory row. JEDEC adopted the term "rank" specifically to address on-going confusion between physical and logical memory "sides".

Case in point, unbuffered DIMMs using 4-bit wide DRAM IC (32Mx4, 64Mx4, 128Mx4, et. al.) will have 16 chips total, eight on each "physical" side, but are in fact only single-rank modules. These are commonly referred to as 'high density' modules, though the term 'high density' is entirely relative and can have different meanings depending on the technology or context being discussed. Another example are registered server DIMMs, which can have up to four (quad) ranks per module, two ranks on each "physical" side.

Reply to tcsenter
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Once again you are a huge time saver! http://www.imagehunt.info/andre09/smile1.gif http://www.imagehunt.info/andre09/smile.gif

Reply to ericjohnson1981

Hey I was wondering what you all thought about my system and if you could help me identify my bottleneck. I got disgusted with Dell and fell in love with Crysis the game at the same time and gave my ispiron 531 a makeover. saved my money and got a amd phenom quad core 9950, motherboard: MSI k9a2 platinum 790 fx am2+, still have the HDD that came with the dell, the 19" monitor (max resolution 1440X900) and had 4 X 1 gig 667 ddr2 240 pin memory (5300u?) recently gave all my old stuff to my parents computer as it took them like 5 minutes just to load a web browser, and gave them two sticks of the memory. I'm going to get new memory but I have no idea if it would be worth just getting all new memory at 800 or 1022. Also as far as graphics go, is a bottleneck at my monitor's resolution? would it look more realistic with a better monitor? My brother told me it could have to do with the HDD speed? Also I don't know if this helps, but I was watching the frames per second and when I put the graphics options to the max my fps dropped to like 18 from 40....

one other side note, have any of you ever had your harddrive say that you're using WAY more gigabytes than you actually are? is this another blessing Dell has bestowed upon me,
if I've learned on solid piece of information of all this it's.... friends don't let friends buy Dell, wish someone woulda told me.
Thanks a bunch

Reply to chrisvsplumber_81
- 0 +

Hi that was a wonderful list.. i am new to the forum and would like to have a happy time here... could anyone brief me about the modern developments in a systems memory?

Reply to 112inky

This is still great stuff, but we need an update for DDR3 with I7 and AM3.

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Reply to Proximon

I have been building computers for quite some time now and long enough to know that things change quickly and constantly and my last build was about 6 mo. ago. In the past, I have had a soft spot for corsair's dual channel memory. I am getting ready for a build with water cooling and I am going to oc to the hilt. I mean extreme and I know most of the parts that I am going to use. As far as a higher and more stable oc, which mobo and ram combo do you recommend?
As for the water cooling, I will stick with Innovatek for the most part. Their the best in my eyes, but some of their stuff is out of stock, so I'll use some Koolance parts and so on. Eheim pumps are hard to beat.

Reply to uberguber

Q: How does memory access work, and what do the timings stand for?
A:
MEMORY ACCESS:
1. tRCD (RAS to CAS Delay) 2-3 cycles, The row is selected by the Memory Controller.
2. CAS (Column Address Strobe) 2,2.5,3 cycles (DDR), The Memory Controller selects the column and now the ROW is
ACTIVE, and the READ COMMAND is sent.
3. Data is sent to the DQ pins after CAS delay.
4. tRAS (Row address Strobe) 6 cycles, The module waits a certain period of time for the data to be active.
5. tRP (RAS precharge) 2 cycles, The Memory Controller DEACTIVATES the row.
6. Memory Cycle repeats as requested by the Memory Controller.

The timings are represented as follows:
2-3-2-6 1T (CAS, tRCD, tRP, tRAS)


---------


Sorry i don't understand this.

Is it better to get a 7-7-7-24 or a 9-9-9-24?

What is the difference between a 7-7-7-24 and a 7-7-7-21?

Couldn't understand the thread i am dyslexic so cannot read very well.

Reply to willclarke

When choosing DDR3, lower timings are always better, given the same frequency. Don't sweat the specific numbers too much. Lower is better in each case.

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Reply to Proximon

Proximon wrote :

When choosing DDR3, lower timings are always better, given the same frequency. Don't sweat the specific numbers too much. Lower is better in each case.




so the 4th number should be lower too? 21 is better than 24?

Reply to willclarke

Yes, but these are small changes.


Message edited by Proximon on 02-24-2010 at 09:56:53 PM
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Reply to Proximon

WOW THATS GREAT MAN THIS POST HELP ME A LOT AND I INCREASED MY MEMORY KNOWLEDGE BY READING THIS MEMORY ARTICLE GREAT MAN GREAT THNXxxxxxxxxxxxxxxxxx


Message edited by chaitanya_mkin on 04-13-2010 at 04:35:02 PM
Reply to chaitanya_mkin

what's sa 2 memory?

Reply to zachanscom
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Reply to sterling1

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Reply to jerybage
- 0 +

I wish I read this thread before I began my research. It would have saved me a lot of time reading wikipedia entries about ram buffering.

spuddyt wrote :

this thread could do with an update, since ddr3 is out now....


What he said.

Reply to NateB

Is there any performance difference between DDR2 800 MHZ and DDR3 1333 MHZ or the difference purely lies in timing of the RAM ?
I am not talking about 2-3 % performance difference which is not even noticeable.
What is the effect of DDR3 or DDR2 or with changed timing on gaming?
I mean, should i go for DDR2 or DDR3 as i am building a new pc?I can buy a mobo accordingly if the difference is huge for gaming.
My current config is
GTX 260 sonic, AMD 550 BE, 600 watt PSU, (1440 * 900 ) monitor.
RAM and mobo i will buy.

Reply to dixit8611

This topic has been desticky in top of the forum by The_Prophecy

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Reply to The_Prophecy

bboysil wrote :

Does anyone know where i can find a more detailed tutorial?
I am interested particulary in the phisical layout of the memory chip and how exactly the address and control signals work together to select a memory location. Use technical terms, i'm not affraid of them :) . thanks


try this http://www.passmark.com/products/rammon.htm

Reply to brianzion

[quotemsg=121486,1,34039]A GUIDE TO UNDERSTANDING MEMORY

hi everyone here is a good ram program to help you identify your specs :wahoo:

http://www.passmark.com/products/rammon.htm


Message edited by brianzion on 10-01-2010 at 11:54:40 AM
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