Confused about memory timing cas vs tras

[BklynRX7]

I'm looking to upgrade the RAM on my build and Ive been comparing a few different models. The one thing I'm confused about is the tras timing. For example I've seen one 16gb with 9-9-9-24 and and another with 8-8-8-27. In a case like this is the lower cas still faster, or does the tras make a difference?

I searched for a while but couldn't find any clear answers on the importance of tras. Thanks in advance.

 

[Sakkura]

The CAS latency is the most important, but they all matter to some extent. I would (slightly) prefer 8-8-8-27 over 9-9-9-24, assuming the clock frequency is the same - otherwise take the one running higher clocks.

 

[lodders]

It also depends on the CPU.
If you have an AMD processor, then the memory access is relatively slow, and so faster memory really helps.
If you have an Intel processor, then the memory access is so much more efficient that faster memory only makes a small difference. You will see the effect when benchmarking, but in normal use, I doubt you will be able to tell a difference.
For my current build I have 1600Mhz CL9 memory because it was only a bit more expensive than CL11.
On our 3570k PC, we have 1866 CL9 memory. I overclocked it to 2000 still at CL9, and gained only a slight benefit.

 

[ingtar33]

I'm looking to upgrade the RAM on my build and Ive been comparing a few different models. The one thing I'm confused about is the tras timing. For example I've seen one 16gb with 9-9-9-24 and and another with 8-8-8-27. In a case like this is the lower cas still faster, or does the tras make a difference?

I searched for a while but couldn't find any clear answers on the importance of tras. Thanks in advance.

What are the command timing "T" states of those ram? if the clocks of the 8-8-8-27 are with T2, while the 9-9-9-24 are with T1, then the 9-9-9-24 probably will be faster (assuming the same frequency). This is one of the games ram manufacturers like to play with their timings. btw: CAS is technically the only timing that can increase a ram's "speed" apart from frequency. That said all CAS does is set the upper limit to the total speed of the ram, and loose timings on the backend will result in ram performing worse.

-BTW: typically your TRAS is within + or - 1 of the CAS X3, when ram sports T1 command timing. you can see some funky low TRAS numbers when people get into T2. It doesn't help in the slightest to combat the T2 disadvantage.

 

[Pinhedd]

I'm looking to upgrade the RAM on my build and Ive been comparing a few different models. The one thing I'm confused about is the tras timing. For example I've seen one 16gb with 9-9-9-24 and and another with 8-8-8-27. In a case like this is the lower cas still faster, or does the tras make a difference?

I searched for a while but couldn't find any clear answers on the importance of tras. Thanks in advance.

What are the command timing "T" states of those ram? if the clocks of the 8-8-8-27 are with T2, while the 9-9-9-24 are with T1, then the 9-9-9-24 probably will be faster (assuming the same frequency). This is one of the games ram manufacturers like to play with their timings. btw: CAS is technically the only timing that can increase a ram's "speed" apart from frequency. That said all CAS does is set the upper limit to the total speed of the ram, and loose timings on the backend will result in ram performing worse.

-BTW: typically your TRAS is within + or - 1 of the CAS X3, when ram sports T1 command timing. you can see some funky low TRAS numbers when people get into T2. It doesn't help in the slightest to combat the T2 disadvantage.

You have absolutely no idea what you are talking about. That is all.