RAM 1T vs. 2T

hey I read somewhere the Asus p5n-e sli ran RAM better at 1T with tight timings than at 2T with loose timings but because I am newb I don't know what 1T and 2T mean...so would anybody care to explain?

 

You have not given your full spec, or Ram modules, so as you are , you say, new to ram timings, I suggest you have a look at a few reviews from overclockers - put your post in to our overclockers forum, to get more help.
Meanwhile, I can tell you that for AMD, cpu's, apparently 2T is preferred, as it is more stable, but I have not seen anything on Intel.
Here is a review ,and test on your motherboard, that was pretty thorough.
http://www.techspot.com/review/43-asus-p5n-e-sli/

Also go here for an excellent explanation of tight memory timings, and clock frequencies

http://tomshardware.co.uk/2006/03/31/tight_timings_vs_high_clock_frequencies_uk/
:guitar

 

Thanks for the links. My RAM is 2x1 gb Mushkin pc6400 at 4-4-3-10, but my question was what do 1T and 2T stand for and how can I use them?

 

Actually, AMD prefers 1T these days. I run at 1T@2-3-3-6 on X2 4400+

1T vs 2T refers to command per clock cycle, IIRC. Obviously, 1T is better, than 2T, if your system can handle it.

 

I offered references for a virtual beginner, but as the man said -I forgot to answer the question.
More information on Adrenalyns explanation on the Command per Clock interface/cycle is in this one, in 5th paragraph
http://www.ithinkibrokeit.co.uk/articles/overclocking/page9.php
:wave

 

This is a common name for the 1T / 2T parameter amongst bios manufacturers, but is rather misleading as it does not mean the number of commands that are executed each clock cycle as its title would imply.

The following is a quote fro the Corsair Document ANS501 'Introduction to Latency Settings'

"................There is one more latency that we must be aware of, commonly known as Command Rate. Command Rate is the delay, in clock cycles, between when the CS# signal is activated and when any command (ACTIVE, for example) can be issued to the RAM. Common values for command rate are either 1 or 2 clock cycles.
Module latencies are often expressed as a combination of these values. The sequence we will use in this paper is CL-tRCD-tRP-tRAS-Command. So, a module with the following designation:
PC3200 2-3-4-5-1T
would have a clock rate of 200 MHz, CAS latency of 2 cycles, RAS-to-CAS delay of three cycles, RAS Precharge of four cycles, ACTIVE to PRECHARGE of five cycles, and a Command Rate of one cycle."

Proper documents by authoritative sources are to be preferred over web tittle-tattle.

I seem to remember posting a reference to my simplified, but correct, explanation earlier today, but it seems to have got lost? Moderator?

Studio T

 

thanks guys you were helpful

 

(Quote) Proper documents by authoritative sources are to be preferred over web tittle-tattle.(End QUOTE) -Studiot.
We do our best to help, sometimes our own knowledge in different fields is limited, but as you can see, there are some with a great deal of experience , at Majorgeeks, who are able to give you first hand knowledge, or, have extensive experience with the different Authoritive resources.

 

If anybody is interested in the full document it is to big to post (600K) so send me a pm + email address.

Studio T

 

Best performance is usually had with 1T, If you face Stability problems try 2T



Free BIOS Optimization Guide http://www.techarp.com/freebog.aspx

 

Thanks for the posts guys; my system actually performs better with the 1T.

I came to this forum due to "PCI FIFO buffer overflow" problems while trying to capture live video on a Epix capture card. The card attempts to write the video directly into frame buffer. Without going into hardware specifics, lets just say this is a very high-end machine and the specs are way above what is required. I could see the RAM faults using task manager ever time the overflow occurred. You guys got me thinking and things are MUCH more stable now. In fact almost flawless. So I'm reading some of the nice references provided.

Thanks again.

 

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