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DDR2 Memory Speeds Explained - Page 9

post #81 of 88
I'd give rep, but I still don't understand. It doesn't help that my mobo shows the dividers as 1:1, 1:1.2, 1:1.25, 1:1.5, 1:1.66, 1:2. I'm quite bad at maths so it doesn't help. Also when I punch in things like 3200/5 = 640 I get confused. When I set my CPU to 320(mult 10x) = 3200, and use 1:1.25 setting I get 800 RAM.

I don't even know what I'm saying. I'm using DDR2 800, and my multi is 10x (C2D E6700.) The more I read the more confused I get, and the charts don't help. I want to get a decent speed of around 3.0GHz and not fudge up my memory. Can anyone give me advice???
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post #82 of 88
Thread Starter 
Quote:
Originally Posted by gamer30;14212197 
I'd give rep, but I still don't understand. It doesn't help that my mobo shows the dividers as 1:1, 1:1.2, 1:1.25, 1:1.5, 1:1.66, 1:2. I'm quite bad at maths so it doesn't help. Also when I punch in things like 3200/5 = 640 I get confused. When I set my CPU to 320(mult 10x) = 3200, and use 1:1.25 setting I get 800 RAM.

I don't even know what I'm saying. I'm using DDR2 800, and my multi is 10x (C2D E6700.) The more I read the more confused I get, and the charts don't help. I want to get a decent speed of around 3.0GHz and not fudge up my memory. Can anyone give me advice???

Well your problem is you have an Intel Core 2 Duo CPU, and this memory guide is for memory being used with an AMD CPU.
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post #83 of 88
Thread Starter 
I suppose I could be helpful still...

Ok, as this guide says DDR stands for "double data rate" meaning it transfers data on the rise and the fall of the signal. So DDR2 800 memory is NOT running at 800MHz, it is running at 400MHz. Well, it wants to run at 400MHz, that's what it is rated for.

Your E6700 runs at the following settings by default:
FSB: 266 MHz
CPU Multi: 12x

You said it is running a 10x multiplier, did you change that? It should be 12x by default. Well at a 266MHz FSB, you would need to multiply the 266 by 1.5 to get to 400MHz, which is what your DDR2 800 wants to run at to be at stock speeds. So if you don't overclock, you would want these settings:

FSB: 266MHz
CPU Multi: 12x
FSB : DRAM - 1:1.5

That would have your system running the E6700 at it's stock speed of 3.2GHz, and run your memory at it's stock speed of 400MHz (DDR2 800 speeds).

The problem is if you overclock the FSB, it will increase the CPU speed and the memory speed. This means you're overclocking two parts at once, so if the system becomes unstable, you won't know whether it is the CPU or the memory that is causing issues. So if you overclock, set the FSB : DRAM to 1:!. This will severely underclock your memory, allowing you to push your CPU as high as it can go. Once your CPU is maxed out (and stable with good temps) you can try increasing the FSB : DRAM ratio to get the memory running faster, or you could leave it at 1:1 because memory speeds don't impact total system performance that much, and after the overclock the memory should be running fairly close to DDR2 800 speeds anyway.

Also, make sure you manually set the memory voltage to what the product packaging listed, and manually set the four main timings as well (i.e. 4-4-4-12, 5-5-5-15, etc)
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post #84 of 88
Quote:
Originally Posted by durch;14212705 
I suppose I could be helpful still...

Ok, as this guide says DDR stands for "double data rate" meaning it transfers data on the rise and the fall of the signal. So DDR2 800 memory is NOT running at 800MHz, it is running at 400MHz. Well, it wants to run at 400MHz, that's what it is rated for.

Your E6700 runs at the following settings by default:
FSB: 266 MHz
CPU Multi: 12x

You said it is running a 10x multiplier, did you change that? It should be 12x by default. Well at a 266MHz FSB, you would need to multiply the 266 by 1.5 to get to 400MHz, which is what your DDR2 800 wants to run at to be at stock speeds. So if you don't overclock, you would want these settings:

FSB: 266MHz
CPU Multi: 12x
FSB : DRAM - 1:1.5

My board only goes up to 10x. From what I understand, Intel bus is "quad pumped" meaning the rated FSB is 4x the FSB setting. The stock value is 1066, which is 266 x 4 = 1066 (1064 really, because it's actually 266.5)

FSB: 266.5
CPU: 10x
CPU clock: 2665
FSB: DRAM = 1:1.5 = 1066

These are the stock speeds taken directly from Intel: Warning: Spoiler! (Click to show)
My MOBO actually automatically OCs the CPU by 3%. It actually runs 2720MHz and 1088 (272FSB) at stock values unless I manually lower it.
Quote:
That would have your system running the E6700 at it's stock speed of 3.2GHz, and run your memory at it's stock speed of 400MHz (DDR2 800 speeds).

The problem is if you overclock the FSB, it will increase the CPU speed and the memory speed. This means you're overclocking two parts at once, so if the system becomes unstable, you won't know whether it is the CPU or the memory that is causing issues. So if you overclock, set the FSB : DRAM to 1:!. This will severely underclock your memory, allowing you to push your CPU as high as it can go. Once your CPU is maxed out (and stable with good temps) you can try increasing the FSB : DRAM ratio to get the memory running faster, or you could leave it at 1:1 because memory speeds don't impact total system performance that much, and after the overclock the memory should be running fairly close to DDR2 800 speeds anyway.

Also, make sure you manually set the memory voltage to what the product packaging listed, and manually set the four main timings as well (i.e. 4-4-4-12, 5-5-5-15, etc)

My current settings are:
FSB: 320
CPU multi: 10x
CPU clock: 3200MHz
FSB: DRAM 1:1.25 = 800

Later, I set the FSB: DRAM to 1:1 and changed the multiplier to 8 so I could get 400 FSB, plus DDR2-800 @ 800. The new clock speed was 3200MHz (3.2GHz) and the rated FSB was 1600MHz. This resulted in lower scores in PCMark05. In fact the scores were lower than even the CPU running at the stock values (see above.) Stock my score was 7022; in my current setup it's 7779; with my CPU and FSB: DRAM set 1:1 with 400FSB and 3200MHz I scored under 7000 (it was 68xx - i don't recall the last two numbers.)

I don't get why, but maybe someone else does. Perhaps AMD and Intel are two totally different worlds. Your information was still helpful to me, at least it got me thinking and trying different settings.
Edited by gamer30 - 7/15/11 at 9:00pm
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post #85 of 88
Thread Starter 
The 400MHz FSB with the CPU at 3200MHz should have produced the best results. I think you may have two problems. A) You're using PCMark05. Why not try a more modern benchmarking tool? B) Your "stock" settings are not stock. Your CPU runs a 12x multiplier stock. Your board cannot support that, which makes me wonder if your board is complete junk, because that is very odd. You might have so other issues going on if the board you're using isn't quality.

But a real stock E6700 at 266 x 12 = 3200 versus a 400 x 8 = 3200 should see better performance at the higher 400MHz FSB. But the difference won't be very noticeable. The real performance gains come from running the CPU at faster speeds. And I'm not talking some tiny little 3% overclock, I'm talking a real overclock. Push that CPU to its limits!
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post #86 of 88
Quote:
Originally Posted by durch;14236666 
The 400MHz FSB with the CPU at 3200MHz should have produced the best results. I think you may have two problems. A) You're using PCMark05. Why not try a more modern benchmarking tool? B) Your "stock" settings are not stock. Your CPU runs a 12x multiplier stock. Your board cannot support that, which makes me wonder if your board is complete junk, because that is very odd. You might have so other issues going on if the board you're using isn't quality.

But a real stock E6700 at 266 x 12 = 3200 versus a 400 x 8 = 3200 should see better performance at the higher 400MHz FSB. But the difference won't be very noticeable. The real performance gains come from running the CPU at faster speeds. And I'm not talking some tiny little 3% overclock, I'm talking a real overclock. Push that CPU to its limits!

I could be wrong about this, as I usually am. I thought when I bought it that the stock speed was 2670MHz, not 3200MHz, and the newer E8xxx series was 3GHz+. I'm going to double check that just to make sure. In the meantime, I'll give your suggestions a try. Which PC Mark should I run? I'm afraid to push it much higher because I already hit up to 66*C when using intel stress test. I tried to get it to 3600MHz but couldn't boot windows. The highest I put the VCore to was 1.38v I think, where I'm currently at 1.35v. I'm thinking about investing in a better cooler than this Gemini II because it's just not doing the job.
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post #87 of 88
Thread Starter 
Quote:
Originally Posted by gamer30;14246975 
I could be wrong about this, as I usually am. I thought when I bought it that the stock speed was 2670MHz, not 3200MHz, and the newer E8xxx series was 3GHz+. I'm going to double check that just to make sure. In the meantime, I'll give your suggestions a try. Which PC Mark should I run? I'm afraid to push it much higher because I already hit up to 66*C when using intel stress test. I tried to get it to 3600MHz but couldn't boot windows. The highest I put the VCore to was 1.38v I think, where I'm currently at 1.35v. I'm thinking about investing in a better cooler than this Gemini II because it's just not doing the job.

Oh ok you have the older version of the E6700. The newer Wolfdale's are 3.2GHz: link Confusing naming schemes, I hate when companies do that.

PCMark Vantage would be the newest edition.
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post #88 of 88
I have created a small excel spreadsheet that can calculate the memory divider, you can use it in your Android to make easy calculations about the resulting RAM frequency based on the bios speed setting.



DDRdividerCalc.xls 28k .xls file

Alex
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