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Difference between SDRAM and DDRRAM

by pcfreak / March 27, 2005 11:23 PM PST

i a thinking of upgrading my SD-RAM to DDR-RAM. my motherboard manual says it supports SD-RAM and DDR-RAM. how do i differ SD-RAM from DDR-RAM? do they use the same memory slots on the motherboard?

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by damasta55r / March 28, 2005 12:55 AM PST

You can differ them, first by color, then the one with less dots in the slot is the sdram usually with 2 areas without holes and the one with only the interruption in the middle of the holes is the ddr-sdram.

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sdram timing
by pcfreak / March 28, 2005 3:28 PM PST

i have two sticks of 256mb pc133 sdram but i can't seem to get them to run at 133mhz. When i set them at 133mhz thru the bios, the system keeps on crashing. When i run them at 100mhz, the system works normally. One stick is Kingston 2MX64PC133CL3 168P and the other is Apacer Tech. (256 MB PC133 SDRAM). The timing for the Kingston one at 133mhz is 3.0-3-3-6 and the Apacer one is 2.0-2-2-6. Is the ram timing the source of this problem?

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Winging it.
by Bob__B / March 29, 2005 3:19 AM PST
In reply to: sdram timing

I'm thinking what your playing with is the master clock.

If you set this to 100MHZ does your cpu speed show correct?

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cpu speed
by pcfreak / March 29, 2005 2:39 PM PST
In reply to: Winging it.

where to i find out the cpu speed?

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cpu speed
by pcfreak / March 29, 2005 2:48 PM PST
In reply to: cpu speed

Here's what i've found out using CPU-Z. Here are the list of clocks:
Core speed - 1999.9MHz
Multiplier - x20.0
FSB - 100MHz
Bus speed - 400MHz

How do i solve the RAM problem from here?

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What settings for RAM timing are
by Ray Harinec / March 29, 2005 9:02 PM PST
In reply to: cpu speed

you using in the BIOS???

Set them to the lowest possible conservative setting, due to the fact that the capability of the two sticks is so different.

First though, I would try each stick by itself with the BIOS setting for "by SPD". That way the specific timing for that stick is provided to the BIOS from the chip on the memory stick. If one runs at 133 and the other doesn't you have some info to use for further troubleshooting.

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by Bob__B / March 29, 2005 9:30 PM PST
In reply to: cpu speed

Look through the output of cpu-z see if it says something like.

AMD 'something'
INTEL 'something'

or look in the bios for a hint or maybe the post screens or some paperwork you have.

Once the make and model is determined then we can see if this 100MHZ is proper.

Put the ram speed on the back burner for a short period.

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The SDRAM is 168 pins while
by Ray Harinec / March 29, 2005 9:08 PM PST

DDR SDRAM is 184 pins. No way to mix them up, unless you try to hammer them in and destroy the mobo.

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Your motherboard manual
by chuckieu / March 30, 2005 6:09 AM PST

has most(if not all) of this info. Also-1.That you can only use one or the other, not both. 2.Which slots to use in each configuration, etc. I was thinking about what Ray suggested, try each stick seperately and see where you stand. chuck

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