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Old 21st June, 2009, 07:03 AM
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Memory confusion

In the new Asrock board, I've been using G. Skill 4Gb (2x2Gb dual channel kit) DDR3-1333 PC3-10600. I ran Everests benchmark on it. Then I added 2Gb (2x1GB) Micron DDR3-1066 PC3-8500 and ran the same benchmark.
It's almost a carbon copy. Just what does this mean? a bad benchmark? The numbers relay don't mean that much? I won't understand the numbers themselves but the fact that they are so close together confuses me.
Leed me by the hand, this all confuses me!
And it says under memory type: Dual Channel DDR3-949. What's with that?

EDIT: I'm running Win 7 x64
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Memory confusion-cachemem_4gb.png   Memory confusion-bench_6gb.png  
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Last edited by PorPorMe; 21st June, 2009 at 07:06 AM.
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Old 21st June, 2009, 07:48 PM
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Bumpez. Little help here, please.
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Old 22nd June, 2009, 03:16 AM
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PorPor, if you have a look at the memory bus speeds, you will note they are the same: 474.7MHz
This is done by the DRAM:FSB multiplier, which is 12:10.
You can work out your memory speed this way:
DRAM:FSB = 12:10
DRAM = FSB * (12/10)
DRAM = 395.5 * (12/10)
DRAM = 474.6
2*474.6 = 949.2 = DDR3-949

If you change the multiplier in bios to one that closer matches the RAM speed, you will possible get more of a difference.

Sorry I don't have a similar board so can't help much further.
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Old 22nd June, 2009, 11:38 AM
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Quote:
Originally Posted by noob View Post
PorPor, if you have a look at the memory bus speeds, you will note they are the same: 474.7MHz
This is done by the DRAM:FSB multiplier, which is 12:10.
You can work out your memory speed this way:
DRAM:FSB = 12:10
DRAM = FSB * (12/10)
DRAM = 395.5 * (12/10)
DRAM = 474.6
2*474.6 = 949.2 = DDR3-949

If you change the multiplier in bios to one that closer matches the RAM speed, you will possible get more of a difference.

Sorry I don't have a similar board so can't help much further.
I don't pretend to understand the numbers (maybe one day!) but you gave me enough to start looking and I did a little changing in the bios.
At least some of the numbers are closer to what the mnfg has them at.
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Memory confusion-cachemem1.png  
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Old 22nd June, 2009, 10:42 PM
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Short answer: DRAM:FSB ratio works like the CPU multiplier but for RAM speed.

Long Answer:
To make it clearer, I have modified your screenshot a little.

Black Box - FSB

Red Boxes (if colour blind these are the 2 on the bottom left)
Top - Memory speed
Bottom - Memory speed which being DDR is 2x 1st Red Box

Green Box (if colour blind this is the single box on right)
This is the ration of FSB speed (Black Box) to RAM speed (Top Red Box)


You will be able to adjust the DRAM:FSB ratio to change your RAM speeds. This means if you overclock the CPU you don't have to overclock the RAM and vice versa.

To work out your RAM speed:

Take the green box.
Change it to a fraction, to do this the item you want the speed of is on the top, in this case, DRAM / FSB, or 20/10
Multiply it by the speed of the item you know - in this case FSB, or 342.4

therefore to find out memory speed

20/10 * 342.4 = 684.8
Then to make it DDR-xxxx double the memory speed 2*684.8 = 1369.6

What this means, is that you can overclock your FSB, then you can calculate the RAM speed from the DRAM:FSB ration and adjust it if needed.
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Memory confusion-everest.jpg  
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Old 23rd June, 2009, 09:47 AM
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Thanks-I won't say it's clear but it's helping and as time allows I'm working on it. I wish i had the time to sit and learn one thing to some degree of understanding but that just isn't possible at the moment. Thanks.
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