DDR3 Command Rate - 1T or 2T

[PC_User]

When manually setting the RAM timings in BIOS, what should I set the "Command Rate" to - 1T or 2T?

What real-world performance will I notice with it set to 1 versus 2? How will this affect system stability when overclocked? System specs are in my signature. Thanks

 

[christpunchersg]

The more slots you use the harder it is to run 1T. 2T is more stable, 1T is slightly faster (2-3%). 1T requires that you have more expensive ram also. Try it out but if 1T doesn't work I highly doubt it would affect any of your real world performances.

 

[PC_User]

The more slots you use the harder it is to run 1T. 2T is more stable, 1T is slightly faster (2-3%). 1T requires that you have more expensive ram also. Try it out but if 1T doesn't work I highly doubt it would affect any of your real world performances.

I have it set at 1T and it seems to be stable so far. Passed LinX and Intel Burn Test.

 

[rahavsmt]

LinX and IBT doesnt really stresses the ram and the imc. You need to run prime blend and/or hci memtest to test for their stability.

 

[PC_User]

LinX and IBT doesnt really stresses the ram and the imc. You need to run prime blend and/or hci memtest to test for their stability.

I thought IBT stress test is even more reliable than Prime, especially since it can stress test in a fraction of the time. Ram usage increases to about 90%...

I'll give HCI MemTest a try.

 

[rahavsmt]

I thought IBT stress test is even more reliable than Prime, especially since it can stress test in a fraction of the time. Ram usage increases to about 90%...

I'll give HCI MemTest a try.

That's true but only for cpu testing. You can also use hci memtest to test all the available ram.

 

[Conker]

1T will feel snappier usually or at least when i used it at that.

 

[GoldenTiger]

1T is typically ~4-5% faster than the same memory/speeds at 2T if I recall correctly... this was a big topic back when DDR2 was brand new. At least when I was benching my main rig awhile back I had a ~6% delta in 3dmark overall scores (~7% on CPU, and SuperPi) when running 1T vs. 2T. I run my 3x2GB (6GB) DDR3 @ 1560mhz 8-8-8 1T at the moment, going to push for more later when I get a better HSF for my CPU (heat is holding me back on clocks)... I personally wouldn't back down to 2T unless it gave me a good chunk of mhz speed in exchange (greater than 5%). Working on pushing to 1620 at the moment but probably won't be able to until I upgrade my cooling some .

 

[(cf)Eclipse]

1T requires that you have more expensive ram also.

It is also very dependent upon how strong your memory controller is. Just like back in the A64 days when there were a select few memory controllers that could clock 4 sticks of ddr1 really high, and some got stuck at like 220mhz with otherwise identical hardware.