what is RAM timing - Techist - Tech Forum

Go Back   Techist - Tech Forum > Computer Hardware > Monitors, Printers and Peripherals
Closed Thread
Thread Tools Display Modes
Old 01-16-2008, 03:58 PM   #1 (permalink)
True Techie
Join Date: Nov 2007
Posts: 182
Send a message via AIM to pts2800
Default what is RAM timing

i dont know alot about RAM, so my question is what is RAM timing, and how and it effect what RAM one buys

also what do all the diffrent numbers mean

just one more thing, how does overclocking effect it?

pts2800 is offline  
Old 01-16-2008, 04:25 PM   #2 (permalink)
Mod Emeritus
b1gapl's Avatar
Join Date: Nov 2004
Location: USA
Posts: 13,044
Default Re: what is RAM timing

Think of the RAM as a spreadsheet, with rows and columns. And think of the timings, as the time it takes to access those rows and columns.

CAS - Column Address Select
RAS - Row Address Select

Each number represents a different function:

4.....CL - CAS Latency
4.....tRCD - The time between RAS and CAS signals
4.....tRP - The time between switching a row
12...tRAS - The time between activating and deactivating a row.

CL or Cas Latency is probably the most important part for RAM timings. It is time between it's signal and the data available for processing. So the lower the CAS, the faster it can get and receive data.

tRCD is the time between, a row being selected/activated, and the column in the row being activated, by the CAS signal. In other words, the time between RAS to CAS being accessed.

tRP is the time between accessing different rows. A row has to be activated, in order to access the information. And before the RAM can access another row, the row that was just accessed, has to be deactivated. So in order words, the time between accessing one row to another.

tRAS is the time between the memory getting the signal, to access a row.

I tried my best to explain it, so please correct me if I'm wrong.



b1gapl is offline  
Old 01-16-2008, 05:08 PM   #3 (permalink)
Lord Techie
Luke's Avatar
Join Date: Dec 2007
Location: Fonthill, Ontario, Canada
Posts: 5,601
Send a message via AIM to Luke Send a message via MSN to Luke
Default Re: what is RAM timing

yeah that a good way to put it b1gapl, when ur buying ram the lower the timmings ex.


the 4-4-4-12 would be faster in the way that b1 explained. Remember though when they have ram up in the thousand mark u have to look at the timmings because it is usually higer then 800mhz and higher means slower
3770K @ 4.7 Ghz H100 Water Cooled | GTX 970 MSI Gold Edition SLI
32GB G.Skill RipJaws (Rendering/ Virtualization) | Corsair 650D | CORSAIR RM1000W w/ White Cable KIt
Samsung 850 Pro 256 GB SSD Boot | OCZ Vertex 3 240GB SSD Secondary | WD Black 1 TB | WD Green 3 TB
Server: Core i7 920 | 8GB RAM | Intel 240gb 730 SSD Boot | 3 x 2TB WD RED | Fractal R4
Luke is offline  
Old 01-16-2008, 05:13 PM   #4 (permalink)
True Techie
Join Date: Nov 2007
Posts: 182
Send a message via AIM to pts2800
Default Re: what is RAM timing

aight well it makes sence so thanks guys
pts2800 is offline  
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
An Extensive Guide: Maximizing Performance, Minimizing Budget Sora New Systems | Building and Buying 42 08-23-2008 05:35 PM
RAM RAM RAM lol SirCyber New Systems | Building and Buying 22 10-17-2007 12:24 PM
RAM Problems? cfgcjm New Systems | Building and Buying 5 10-02-2007 11:53 AM
More RAM vs Tighter Timing? pinoy3000 New Systems | Building and Buying 38 09-15-2007 12:00 AM
ram timing won't accept change lancec2c30 Overclocking and Modding 0 09-13-2007 11:17 PM

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 03:03 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.