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TW3X4G1333C9DHX Underperforming?


Xenon

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I bought these dual modules TW3X4G1333C9DHX 2 weeks ago.

Firstly my Bios detects it as 1066MHz modules.

That's ok as it probably the default setting.

But I have trouble to see an increase in performance when I have insert the manual override of the ram modules to 1333Mhz and the Latency inputs that you suggest for the specific ram. 9-9-9-24.

 

As i benchmark the memory I get a performance rating of 6,5Gb/s. Which is almost the same if I have memory in default 1066MHz setting or 1333Mhz setting. Can you explain this?

 

From the benchmarking point 6,5Gb/s is equivalent to DDR2 800 MHz, which i'm quite disapointed that it not performs better than that.

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The latencies of DDR3 are far higher than the latencies of 1066Mhz so yes, they should be close to the same. It's only in the higher end do you find difference. And you are running with two sets? This also puts load on the memory controller and lowers your bandwidth. Also, the speed of the memory is dependent on the memory controller. Remember as well, that the latencies in Auto at 1066 are lower than the latencies of 9-9-9-24 which also brings them closer together.

 

If you want speed, then buy high speed low latency memory rather than purchasing the lowest end of DDR3. Or you can overclock them and see what additional performance you will get.

 

http://www.anandtech.com/memory/showdoc.aspx?i=2989&p=1

http://www.extremetech.com/article2/0,2845,2159795,00.asp

http://www.xbitlabs.com/articles/memory/display/ddr3.html

 

I bought these dual modules TW3X4G1333C9DHX 2 weeks ago.

Firstly my Bios detects it as 1066MHz modules.

That's ok as it probably the default setting.

But I have trouble to see an increase in performance when I have insert the manual override of the ram modules to 1333Mhz and the Latency inputs that you suggest for the specific ram. 9-9-9-24.

 

As i benchmark the memory I get a performance rating of 6,5Gb/s. Which is almost the same if I have memory in default 1066MHz setting or 1333Mhz setting. Can you explain this?

 

From the benchmarking point 6,5Gb/s is equivalent to DDR2 800 MHz, which i'm quite disapointed that it not performs better than that.

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I'm using Sisoft Sandra 2009.

The thing is that I would expect that firstly when i've bought 1333Mhz ram i would expect the ram to perform like 1333Mhz. Not like 800Mhz. I know you should always be careful benchmarking as systems mazy vary very much. But these results seem far off.

Can it be rightly assumed that the ram of my system is the bottleneck? In my opinion it souldn't.

 

Derek the report you refere to on extremetech.com says that 1333MHz should perform 10,67Gb/s not 6,4Gb/s which is more like 800Mhz DDR3. Seems to me i lack 5Gb/s performance. Or is there something i'm missing here?

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This is dependent on chipset and latencies. It is also dependent on the motherboard manufacturer. Many motherboard manufacturers have memspeed technology that shows a far greater response on memory than Intel made boards.

 

http://i259.photobucket.com/albums/hh293/DerekT2008/mem-1.jpg

 

http://www.anandtech.com/memory/showdoc.aspx?i=2989&p=5

 

However, if you truly believe that it is the memory that is at error here, then move to different memory of the same speed and see if you find a difference.

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