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Overclocked ram & Why 1:1? - Page 4

post #31 of 88
Quote:
Originally Posted by Choggs396 View Post
It isn't silly. A 1:1 ratio will typically run faster compared to memory running at the same speed that is out of sync on tests like 3DMark or PCMark.
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post #32 of 88
Quote:
Originally Posted by pauldovi View Post
Like I said, I'm working on it right now... but I know in most cases it's true.
    
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post #33 of 88
Quote:
Originally Posted by jcharlesr75 View Post
I would like to add something to this.....I recently purchased and installed Super Talent ddr2-800. According to the website the ram runs at 800 mhz with 4-4-3-8 timings at 2.2v. If i run it at these settings(745 mhz actually with 1/1.33 divider in bios) my sandra results are 7800 mb/sec. If i up the divider to the 1/1.66(902 mhz 4-4-4-12 timings), my sandra says 6800 mb/sec. So i am thinking that added bandwidth isnt always better?
you also have the variable of timing in the table. if you really want to compare them then you have to keep the timings the same
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post #34 of 88
Quote:
Originally Posted by Choggs396 View Post
Like I said, I'm working on it right now... but I know in most cases it's true.
Here is my proof:


FSB = 200
Mutliplier = 9
CPU Speed = 1.8Ghz

@ 1:1 DDR2-400 Memory bandwidth = 3224MB/s
@ 2:3 DDR2-600 Memory bandwidth = 3774MB/s
@ 1:2 DDR2-800 Memory bandwidth = 4047MB/s
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post #35 of 88
Quote:
Originally Posted by Grim View Post
Lower the Divider the better.

Basically, Benchmarks over the years have repeatly shown that a system running at 3GHZ using a higher FSB, will outperform in most cases, a system running at the same speed, which is more dependent on multi..
I think you might be thinking of something else here. the cpu speed has nothing to do with what we are talking about. this is more of a is ram only to use a 1:1 ratio on the ram or some other ratio on the ram


Quote:
Originally Posted by Choggs396 View Post
I like to run 1:1. Personally, I think the only reason why a memory divider should be used is when the FSB is too high for the memory to handle at a 1:1 ratio.
what about those situations where your FSB has reached it's limit but your ram can go higher?
also paul didn't call you a childish name he just said the statement.
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post #36 of 88
Quote:
what about those situations where your FSB has reached it's limit but your ram can go higher?
Dont get too used to it...

Just got the P5K in the mail, and will be trying for 600mhz FSB soon. With ddr3 coming mainstream, we shouldnt have those 'problems' anymore.
post #37 of 88
Quote:
Originally Posted by pauldovi View Post
Here is my proof:


FSB = 200
Mutliplier = 9
CPU Speed = 1.8Ghz

@ 1:1 DDR2-400 Memory bandwidth = 3224MB/s
@ 2:3 DDR2-600 Memory bandwidth = 3774MB/s
@ 1:2 DDR2-800 Memory bandwidth = 4047MB/s
Thanks for the information. But those numbers actually prove my point. Why?

I said:
Quote:
A 1:1 ratio will typically run faster compared to memory running at the same speed that is out of sync on tests like 3DMark or PCMark.
Now, you tested those bandwidths at different speeds. But if you do the math, the MB/s compared to every single MHz shows I am right. You have to run a control (the MHz) - to Bandwidth to show fair comparisons, like this... My proof:

3224 MB/s ÷ 400MHz = 8.06 MB/s per 1MHz with 1:1 Ratio
3774 MB/s ÷ 600MHz = 6.29 MB/s per 1MHz with 2:3 Ratio
4047 MB/s ÷ 800MHz = 5.06 MB/s per 1MHz with 1:2 Ratio

So if you can read the math correctly, then the bold clearly shows a decrease in real bandwidth at the same speed using un-synced ratios.
    
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post #38 of 88
Quote:
Originally Posted by CL3P20 View Post
That OCZ CAS5 will never see the light of 1ghz...never.
    
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post #39 of 88
Uh oh sounds like another war is on our hands. With all the benches that I have run I allways try to max the speed on everything cpu/fsb/ram. When I can run my ram at its fastes say 550mhz I get better performance in any bench that I run as compared to running it at say 440mhz 1:1.

I would have to do some more benches to prove my point but really ask anyone trying to squeeze a few extra points out of a benchmark and they will agree to run everything as fast as possible.

Just my 2 cence.
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post #40 of 88
Quote:
Originally Posted by Choggs396 View Post
Thanks for the information. But those numbers actually prove my point. Why?

I said:


Now, you tested those bandwidths at different speeds. But if you do the math, the MB/s compared to every single MHz shows I am right. You have to run a control (the MHz) - to Bandwidth to show fair comparisons, like this... My proof:

3224 MB/s ÷ 400MHz = 8.06 MB/s per 1MHz with 1:1 Ratio
3774 MB/s ÷ 600MHz = 6.29 MB/s per 1MHz with 2:3 Ratio
4047 MB/s ÷ 800MHz = 5.06 MB/s per 1MHz with 1:2 Ratio

So if you can read the math correctly, then the bold clearly shows a decrease in real bandwidth at the same speed using un-synced ratios.
What does MB/s per Mhz tell us? I do not believe this is any useful information. You information does not tell us how fast it is.
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