DDR SDRAM Dual Channel Issue please help!!!

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pcwizdan

Thread Starter
Joined
Dec 23, 2005
Messages
7
I have 3 memory slots that support up to 1GB on each slot
they go like this
[][] []
1 2 3

If i put a memorystick in one of the first two slots and the other in the 3rd ddr dual channel is enabled
but when i boot into windows XP PRO it has an popup like error about the memory and not the blue screen but is frozen.

If I try one of the two alone in the computer it will load up but when i am on it for awhile it just stops immediatley and freezes with no blue screen just the desktop and whatever i was working on.

If I am in a game the sound either gets crackly and then freezes or it repeats the sound and then freezes and I have to then restart.

I tried ultra memory
2 of them, each DDR SDRAM 512mb 333MHz

I tried Corsair Value select DDR SDRAM Dual Channel 2 512MB at 333MHz

I looked on the motherboard and there is a jumper for changing the processor speed or changing the memory speed in bios
if the jumper is at 1-2 you can adjust the processor.
if at 2-3 you can adjust the memory Speed.

and i think it may be that the memory is running at 333MHz and the processor is talking to it or thinking at 166MHz

When i boot up in it says it is running the processor at 166
with a multiplier of 13x result is 2.166 GHz
What is the problem

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Post replies from computing.net forums.
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Reply:
I don't know why it is freezing, but I can tell you that your BIOS will read the memory at 166 MHz even when it is 333 MHz memory. The reason for this is that it is 333 MHz dual channel memory and 166x2=333, hence, when running in dual channel mode, its at 333MHz. So there is no error or descrepancy with that. As to the freezing, I couldn't tell you. Though I can make an educated guess that if you're running three DIMMS, it won't be running in dual channel mode and you may have problems there. I always run either two or four DIMMS in my machines.
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Reply:
That explanation isn't quite correct. You have DDR-SDRAM (Double Data Rate)...the actual bus setting is 166MHz, but this is theoretically doubled creating an "effective" bus speed of 333MHz. Dual channel mode is an entirely different technology. What that does is combine the bandwidth of the RAM. In other words, if you have 2 x 512MB sticks of PC2700 (DDR333) @ 166MHz in single channel mode, you'd have 1GB with a bandwidth of 2667MB/s. But if you run the same 2 sticks @ 166MHz in dual channel mode, the bandwidth effectively doubles to 5333MB/s.
Test your RAM with memtest86:

http://www.memtest86.com/#download0
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Reply: (this is me.)
i did test my ram with memtest86
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Post replies from tech-forums.net
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reply:
Do you have the manual for your MOBO ? You may need to see how the manufacturer needs you to place your RAM. You may also want to run MEMTEST86 or MEMTEST. Memtest86 is bootable. It will test your RAM.
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Me again
i ran memtest forgot to say

i ran memtest
and it came up with no errors
so i dont think the memory is corrupt
and the new memory i got is on the compatibility list for the motherboard because the memory controller is on the motherboard

like i said i think it is an issue of memory timings ect

could you help me
under stand the lingo of this
i know what multiplier is
it is like
i have processor at 166 it multiplys it by 13 so result is about 2166MHz
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reply:
How many sticks did you have in ?
Have you tried all possible slot choices ?
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Me
yes all possible slot choices
so i know it isnt the motherboard slots
but if i use only one it does ok
but like in IE or anything after awhile
(maybe it gets overloaded on the memorystick and the connection between my processor and memory is like not enough)
so
what does FSB mean (i know Front Side Bus)
but what does it do or what is it.

one other thing there is a high pitched sound from my case
it comes from the memory
but i haven't intentionally set anything overclocked.
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reply:
Interesting. Have you made any changes in your Bios ?
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ME

Yes.
Here is what i remember...

(these changes in the bios did not cause the issues because i had the problem since i built my pc.)

AGP MB is set to 128mb because on the nvidia website it told me to

Bios shadow and chaching are both off.

i have the processor frequency at 166mhz
multiplier at 13

but there is mention in the motherboard manual of the jumper on the motherboard that if on 1-2 you are able to change processor freq in BIOS and on 2-3 you're able to change memory freq in BIOS

i Have a Question?
if the memory was at 333mhz and the processor was talking to the mem at 166mhz could that explain that after awhile it will freeze because of overloading the mem??

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side note:
I have the latest BIOS version, Video Card Driver, Audio Driver.
 
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