Which Ram is Faster?

Unfettered · Jul 10, 2011

Previously I had two dimms of geil hand picked ddr2 800mhz 3-3-3-8 ram($240 bucks in 2007). I bought a 6870 and when it was installed and booted up it fried my mobo and one of my dimms. So I had to replace them both and ended up with 2 dimms of 1066 5-5-5-15 ram.

I remember there was a formula in some tech article that calculated which of these would be faster based on speed/timings, but I cannot find it.

Does anyone know the formula, or which ram is quicker/faster? The 800mhz @ 3-3-3-8, or the 1066mhz @ 5-5-5-15?
:shrug:

CharMz · Jul 10, 2011

From my knowledge of what other have posted

...I believe you will see more a difference in lower timings than more speed

Steven-1979 · Jul 10, 2011

From what I remember, and this was from a while ago, I think the charts showed ddr2 800 @ 4-4-4-12 was roughly equal to ddr2 1066 @ 5-5-5-15

Psykoikonov · Jul 10, 2011

DDR2 800 @ CL3 = 7.50ns, where DDR2 1066 @ CL5 = ~9.38ns. So DDR2 800 CL3 is faster.

DDR2 800 @ CL4 = 10.0ns, slightly slower than DDR2 1066 @ CL5.

To get the times take the DDR value and divide by 2 then invert and multiply by the timings, or invert the DDR value and multiply by 2 and multiply by the timings. Multiply by 1000 for the time in nanoseconds.

edit: all theory of course

Bobnova · Jul 10, 2011

Pretty much, yeah.
1066 allows for a higher FSB than 800 as well.

Unfettered · Jul 11, 2011

This is my current OC. I was attempting to get my memory to 1T command rate. Unfortunately I have been unsuccessful to this point. I was trying to raise my FSB to be closer to my DRAM so that 1T would post.

Anyone have any idea's?

Bobnova · Jul 11, 2011

1t on DDR2 typically takes a lot of voltage on the ram. Not 24/7 types of voltage.
The only time I've seen it done recently there was 2.6v on the ram, and the ram was a 2x1gb kit of D9 ICs.

My advice is to leave it at 2t.

Unfettered · Jul 11, 2011

I believe that is going to end up being my only option. It's sad really considering that the ram is supposedly rated for 1066 @ 5-5-5-15-1T

Bobnova · Jul 11, 2011

Are you sure? I ask because I have literally never seen DDR2 rated at 1t.

Unfettered · Jul 11, 2011

http://www.techarp.com/showarticle.aspx?artno=349

This is not my original reference, I can't seem to find it. However this states the same thing.

I need to organize my bookmarks

Bobnova · Jul 11, 2011

Wild, there's a first time for everything! Thanks for the link.

You may be able to run 1066-4-4-4-2t, that'd be around the same speed as 1066-5-5-5-1t.

Which Ram is Faster?

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