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Timing or Speed

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October 3, 2010 6:07:45 AM

I'm just trying to understand the whole changing the timings in BIOS. By default the memory @ 1.8V and 400MHz is 5-5-5-18, but at 2.2V and 266MHz, the timings are 4-4-4-12. Which one is better (I am assuming the 4-4-4-12, but won't it run slower compared to the 400MHz at stock?

Thanks

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a b } Memory
October 3, 2010 11:15:00 AM

1) What are the specific specifications of the memory, so we know where you should be.

2) Based on what you are showing, The 400MHz setting is the better settings. A) Lower Voltage Requirement & B) There is little difference between Cas4 & Cas5 so the higher speed will make the difference. I would say if you were running DDR3 1333 Cas7 versus DDR3 1600 Cas9, to go with the DDR3 1333 because the Cas difference would matter.
October 3, 2010 2:42:12 PM

Thanks for the replay. The memory is Crucial Ballistix Tracer DDR2 800. The SPD table in CPU-Z gives these options"

4-5-5-15 @ 1.8V 333Mhz, 5-5-5-18 @ 1.8V 400MHz, 4-4-4-12 @ 2.2V 400MHz, 5-5-5-15 @ 2.2V 500MHz.

I have a C2D E6550 (333 x 7.0) that I want to overclock and an ASUS P5-K Deluxe WIFI/ AP board. What are the best settings to change the FSB and the memory timings too? And will I see any noticable difference in changing the memory timings or will I just gain a couple of point in those benchmark progs?

Thanks
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a b } Memory
October 3, 2010 3:34:01 PM

You'll probably get more help with the overclocking in the Overclocking forum but I'll leave that up for other's input. I'm not one to recommend settings without being there :) 

As for the RAM, you will see little difference outside of benchmarks. With that said, I would go with the 5-5-5-18 @ 1.8V 400MHz settings (balance between the settings).
a b } Memory
October 6, 2010 5:26:36 AM

I see you have 333 Mhz processor bus speed.

To calculate the needed RAM speed is 333x2=667 Mhz. So memory with 667 Mhz is enough to get 1:1 ratio with your processor's bus speed. You can set the DDR to 4-5-5-15 @1.8v 333 Mhz to achieve best stability.

IMHO, setting it to 4-4-4-12 800 Mhz will bottleneck at processor's bus speed since the available memory bandwidth is greater than those transmitted from processor. Perhaps a more experienced overclocker can help me.
a b } Memory
October 6, 2010 5:29:28 AM

Setting to tighter timings will only help a couple of points.In games it doesn't differ much between 5-5-5-15 and 4-4-4-12. Maybe 1 ~ 2 fps. But it's always good to get a little extra out from your stuff. In memory read it will be 100 MB/s difference between the two, though.
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