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If my ram is downclocked. Can I tighten timings?

post #1 of 16
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A while back I ran the intel burn test and I passed 5 passes. Today I upgraded my cooling and I ran it again... this time it failed.

So now I'm started to think that maybe my ram timings can be tweaked a bit. The stock settings for these guys is [1066mhz] 5-5-5-15 (2.0V-2.1V)

As you can see the timings are pretty loose right now... so here's my question.
Since they running at 800mhz, should my timings be tighter or looser then the stock timings?



Any suggestions on how I should proceed would be greatly appreciated.
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post #2 of 16
If 1066mhz is 5-5-5-15, you can probably do 800mhz @ 4-4-4-12. Lower is better.
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post #3 of 16
Use a ram divider to get the ram close to their stock speed (533mhz), then manually set the timings to 5-5-5-15.
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post #4 of 16
Look at your 400 set. That is what's recommended and from there you might be able to cutoff 1 or 2 from those numbers. Try for 5-4-4-13(maybe 12).
     
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post #5 of 16
It is very possible, but you will only be able to know if you try. Your other option is to use CPU-z and click on the "SPD" tab to find out what timings are standard for the memory you use. It often lists 2 or 3 frequency and timing configurations, so you could try one of those and work your way to tighter timings from there.

Quote:
Originally Posted by Acoma_Andy View Post
If 1066mhz is 5-5-5-15, you can probably do 800mhz @ 4-4-4-12. Lower is better.
Not necessarily. It depends upon the number of latency cycles produced in the same amount of time, and how various software interacts with the memory.
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post #6 of 16
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Quote:
Originally Posted by stargate125645 View Post
It is very possible, but you will only be able to know if you try. Your other option is to use CPU-z and click on the "SPD" tab to find out what timings are standard for the memory you use. It often lists 2 or 3 frequency and timing configurations, so you could try one of those and work your way to tighter timings from there.

Not necessarily. It depends upon the number of latency cycles produced in the same amount of time, and how various software interacts with the memory.
So that's what those are for... I'm looking at them right now and my 400mhz column says I can run them at 5-5-5-15 with a trc of 24... however my voltage is suppose to drop from 2.1 to 1.8...which is kind of odd because on the sticks it says 2.0-2.1 (i guess that's for stock speeds)

You can't kill ram from undervolting right?
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post #7 of 16
Thread Starter 
Quote:
Originally Posted by br3nd064 View Post
Use a ram divider to get the ram close to their stock speed (533mhz), then manually set the timings to 5-5-5-15.
I hadn't thought of that simply because I had seen people say that a 1:1 is the best ratio to shoot for.

Thanks for the suggestion though, that gives me another option.
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post #8 of 16
Quote:
Originally Posted by Heavy Light 117 View Post
So that's what those are for... I'm looking at them right now and my 400mhz column says I can run them at 5-5-5-15 with a trc of 24... however my voltage is suppose to drop from 2.1 to 1.8...which is kind of odd because on the sticks it says 2.0-2.1 (i guess that's for stock speeds)

You can't kill ram from undervolting right?
Your computer just won't POST if it's undervolted. The specifications listed on the stickers on the DIMM modules themselves are the settings required for the intended operational frequency of that model. I hesitate to use the term "stock" here because many manufacturers will bin lower speed RAM to filter out the better performers and use those to produce their higher frequency models, meaning that the RAM stock speed may be lower than the advertised operational speed of the model.

Quote:
Originally Posted by Heavy Light 117 View Post
I hadn't thought of that simply because I had seen people say that a 1:1 is the best ratio to shoot for.

Thanks for the suggestion though, that gives me another option.
Be careful that you know what people are referring to when they use 1:1 as often times someone will be referring to the FSB (266MHz) and not the quad pumped FSB (1066MHz). I believe for a Core 2 Duo you want to have the RAM speed be twice the FSB, so 533MHz single data rate for 266MHz FSB. That works out to a DDR of 1066MHz for the RAM and a quad-pumped FSB of 1066MHz.
Edited by stargate125645 - 2/11/09 at 3:25pm
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post #9 of 16
Quote:
Originally Posted by Heavy Light 117 View Post
I hadn't thought of that simply because I had seen people say that a 1:1 is the best ratio to shoot for.

Thanks for the suggestion though, that gives me another option.
A 1:1 ratio is best for tight timings (which really don't make a difference). A higher ratio (ie. 2:3 or 3:4) offers better performance because there's more bandwidth to work with.
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post #10 of 16
Quote:
Originally Posted by br3nd064 View Post
A 1:1 ratio is best for tight timings (which really don't make a difference). A higher ratio (ie. 2:3 or 3:4) offers better performance because there's more bandwidth to work with.
You really need to qualify your statements because written in the general sense that you employed it doesn't make sense. Terms such as bandwidth are ambiguous at best - especially when you consider that the available memory bandwidth doesn't change. The memory throughput achieved can change, and I believe that is to what you were referring. And again, looser timings and faster frequency are not always better as I've outlined in a previous post.
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