1t is better, but most DDR2 is not stable at 1t. You may be able to get it stable, but usually the timings need to be so loose there is a loss in performance.

 

If you can get stable at 1T use it, as there is a 5-10%+ performance increase availble using that setting. However as drald says you may have stability issues with it. I used it a while back with some Corsair GB DDR TwinX and the difference in performance was really noticable.

 

It's the command rate for RAM. It used to be for AMD ddr1 systems you would want 1T for running dual channel with 2 sticks.

Now it's very unstable, so just leave it at 2T for ddr2 and you'll be fine.

 

If you can run 1t then do it. With 2x1g you should be able to get 1t stable with no problems. When you go to 4 dimms then you don't have a choice but run 2t.

As far as performance loss 1tvs2t, I'm not sure. Some people say it's acctually a significant difference. But then again 2t gives you more stability so you should get away with higher clocks overall.

 

2T is when your RAM is running too fast, for your mem controller, so it'll need to 'STABLIZE' its drop down to 2timings, or 2T. which by benchmarks does make a diff but by you actuall eyes it wont

 

Quote:

Originally Posted by Salku 2T is when your RAM is running too fast, for your mem controller, so it'll need to 'STABLIZE' its drop down to 2timings, or 2T. which by benchmarks does make a diff but by you actuall eyes it wont

With ram running at 1T there IS a visual difference to in speed AND response times. I've seen it.

 

most DDR2 ram won't be able to run 1T... especially with more than 2 slots filled... the ones that can run 1T end up having to run closer to stock speeds (no overclocking)

For example my SLI-readies can run 4-4-4-15 1T @ 800MHz.... but get better performance from 5-5-5-15 2T @ 1000ish MHz

1T offers a nice bandwidth boost over 2T, but most sticks can't handle it and will benifit more from having their clock speeds pushed

 

I ran the crysis benchmark tool at medium res, medium settings to get an idea of how much difference there is between 1t and 2t.

Same exact same settings, clocks and timings at 5-5-5-15 with g-skill ddr2 800, only variable was 1t or 2t did 3 runs these are the averages:

1t Average fps: 27.7

2t Average fps: 27.685

I honeslty expected like a 5% hit at 2t. But given these results I'd say it's a very small difference especially since you might get away with higher clocks with 2t.

 

umm wow,
am i just an idiot,
or does anyone else not know what 1t and 2t are????

 

Quote:

Originally Posted by arekieh umm wow, am i just an idiot, or does anyone else not know what 1t and 2t are????

...are you just going to make a needless comment or are you going to elaborate?

 

Quote:

Originally Posted by killa_concept ...are you just going to make a needless comment or are you going to elaborate?

???
the question is,
what is 1T and what is 2T
sorry if it wasnt obvious

 

Command Rate is the amount of command (cycles) it takes for a RAM module to react to a command from a program or user. 2T and 1T are how most modern modules are classified. 1T is the faster rate. Think of it this way. When you click to do something in Guild Wars, that command is issued to the processor and depending on availability, it is issued to the RAM at some point. That information reaches the RAM, but it takes either 1 cycle (hertz) or 2 cycles (hertz) to trigger a reaction. Now, considering DDR2-800 runs @400MHz x 2 as explained below, that means that it would take approx a 8th of a millionth of a second for the RAM to respond if the command rate was 1T, and a 4th of a millionth of a second if it was 2T. Sounds like a very small number, but add it up... If Guild Wars issues 600 million commands per second to the processor, the RAM has to do that. That can mean the difference between 20 frames per second (FPS) and 40 FPS. Now it sounds more important right? If you are comparing two modules of RAM, one having a 1T and the other having a 2T command rate, and your budget can be pushed or allows for the 1T, go with that. Motherboard settings can be tweaked to allow for faster performance in 40% of the applications you will use because of command rate.

Ref : http://guildwars.incgamers.com/forum.../t-442997.html

 

Quote:

Originally Posted by arekieh ??? the question is, what is 1T and what is 2T sorry if it wasnt obvious

and then the question became "are you going to elaborate?"

which you haven't

never mind it got elaborated

 

Quote:

Originally Posted by arekieh ??? the question is, what is 1T and what is 2T sorry if it wasnt obvious

hang on !!!!!!!

he's asking what they are or what they do ....how is he supposed to ''elaborate''
on a subject he dosen't know about .....

 

Quote:

Originally Posted by orbiter Command Rate is the amount of command (cycles) it takes for a RAM module to react to a command from a program or user. 2T and 1T are how most modern modules are classified. 1T is the faster rate. Think of it this way. When you click to do something in Guild Wars, that command is issued to the processor and depending on availability, it is issued to the RAM at some point. That information reaches the RAM, but it takes either 1 cycle (hertz) or 2 cycles (hertz) to trigger a reaction. Now, considering DDR2-800 runs @400MHz x 2 as explained below, that means that it would take approx a 8th of a millionth of a second for the RAM to respond if the command rate was 1T, and a 4th of a millionth of a second if it was 2T. Sounds like a very small number, but add it up... If Guild Wars issues 600 million commands per second to the processor, the RAM has to do that. That can mean the difference between 20 frames per second (FPS) and 40 FPS. Now it sounds more important right? If you are comparing two modules of RAM, one having a 1T and the other having a 2T command rate, and your budget can be pushed or allows for the 1T, go with that. Motherboard settings can be tweaked to allow for faster performance in 40% of the applications you will use because of command rate. Ref : http://guildwars.incgamers.com/forum.../t-442997.html

Thanks Orbiter, good info.

 

No Probs

 

Quote:

Originally Posted by orbiter Command Rate is the amount of command (cycles) it takes for a RAM module to react to a command from a program or user. 2T and 1T are how most modern modules are classified. 1T is the faster rate. Think of it this way. When you click to do something in Guild Wars, that command is issued to the processor and depending on availability, it is issued to the RAM at some point. That information reaches the RAM, but it takes either 1 cycle (hertz) or 2 cycles (hertz) to trigger a reaction. Now, considering DDR2-800 runs @400MHz x 2 as explained below, that means that it would take approx a 8th of a millionth of a second for the RAM to respond if the command rate was 1T, and a 4th of a millionth of a second if it was 2T. Sounds like a very small number, but add it up... If Guild Wars issues 600 million commands per second to the processor, the RAM has to do that. That can mean the difference between 20 frames per second (FPS) and 40 FPS. Now it sounds more important right? If you are comparing two modules of RAM, one having a 1T and the other having a 2T command rate, and your budget can be pushed or allows for the 1T, go with that. Motherboard settings can be tweaked to allow for faster performance in 40% of the applications you will use because of command rate. Ref : http://guildwars.incgamers.com/forum.../t-442997.html

Thank you very mch +rep, great explanation,
However one more question, how do you find out if ur ram is 1T or 2T??
and once again, sorry if this is a ******ed question, but i truly have no clue

 

Quote:

Originally Posted by arekieh Thank you very mch +rep, great explanation, However one more question, how do you find out if ur ram is 1T or 2T?? and once again, sorry if this is a ******ed question, but i truly have no clue

It might say on the actual sticks themselves, for example mine says 4-5-4-11 2T, and you can always check it in the BIOS.

 

Quote:

Originally Posted by gamer7 I ran the crysis benchmark tool at medium res, medium settings to get an idea of how much difference there is between 1t and 2t. Same exact same settings, clocks and timings at 5-5-5-15 with g-skill ddr2 800, only variable was 1t or 2t did 3 runs these are the averages: 1t Average fps: 27.7 2t Average fps: 27.685 I honeslty expected like a 5% hit at 2t. But given these results I'd say it's a very small difference especially since you might get away with higher clocks with 2t.

Few games are going to show a noticeable performance difference from altering memory speed or timings. Crysis will probably show one of the least.

All other things being equal, you could probably go from single channel DDR2 533 @ 5-5-5-15-2 to dual channel 1066 4-4-4-12-T1 before you saw a 5% difference in Crysis on medium.

 

Quote:

Originally Posted by nathris It might say on the actual sticks themselves, for example mine says 4-5-4-11 2T, and you can always check it in the BIOS.

Sorry, where in the bios? in timings?

EDIT* i have this ram

 

Quote:

Originally Posted by arekieh Sorry, where in the bios? in timings? EDIT* i have this ram

Yea it will be in the timings, on my 650i its labelled as Command Rate.

90% of all DDR2 out there is 2T, but there are a considerable number that will run at 1T.

 

The ram itself is not normally rated at 1T or 2T (That's a BIOS command setting) You just have to run tests with your ram and perhaps try the 1T setting to see if your system will run stable with it. I have only ever had one matched pair of l'ow latency' (fast ram) Corsair DDR TwinX 'C2' ram that would run stable at 1T, but that sort of memory is always more expensive and most believe that for such a small performance increase, very expensive ram is just not worth the cost.

 

Quote:

Originally Posted by nathris Yea it will be in the timings, on my 650i its labelled as Command Rate. 90% of all DDR2 out there is 2T, but there are a considerable number that will run at 1T.

Quote:

Originally Posted by orbiter The ram itself is not normally rated at 1T or 2T (That's a BIOS command setting) You just have to run tests with your ram and perhaps try the 1T setting to see if your system will run stable with it. I have only ever had one matched pair of Corsair DDR TwinX 'C2' ram that would run stable at 1T, but that sort of memory is always more expensive and most believe that for such a small performance increase, very expensive ram is just not worth the cost.

thanks to both of you,
+reps

 

Quote:

Originally Posted by Blameless Few games are going to show a noticeable performance difference from altering memory speed or timings. Crysis will probably show one of the least. All other things being equal, you could probably go from single channel DDR2 533 @ 5-5-5-15-2 to dual channel 1066 4-4-4-12-T1 before you saw a 5% difference in Crysis on medium.

Yeah I didn't realize timings were so insignificant. What do you think 2gb vs 4gb would do?

I saw some benchmarks on vista 64 showing 9-20% increase in fps with 4gb on different games. Suprisingly the ones that didn't use a lot of memory got the most boost.

 

CPU-Z will also show if your running at 1T or 2T.

I can't say I've see any difference between 1T and 2T, but 1T is supposed to be better, and I can run it, so I do.