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Settings? ABIT AV8 & 2 pairs of TWINX1024-3200XL


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Someone left me THIS reply, too:


As soon as you install 4 dimms to that board, the memory speed will drop to 333mhz because of the CPU memory controller. You can try and manually raise it back to 400mhz, but a bump in memory voltage, CPU Voltage and northbridge voltage might be necessary.


Do you agree - and, if so, how much of a bump to each of those three things would you recommend?


Thanks again!

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First of all, I've set the first three settings of 2-3-3-6, but there's nothing that's obviously tRAS (active to precharge delay), I don't remember which of the available settings corresponds to that.

I added the new memory sticks, and ... NOTHING, not even the opening screen that allows me to access BIOS.

So I went back to the old set-up, changed the BIOS settings, shut off the machine, switched the old sticks to the other two (purple) slots & added the new ones to the first slots - and it boots up normally, showing the full amount of memory, to the point where XP should boot... which it never does, leaving me with a black screen.

These memory sticks were running perfectly in a machine identical to mine (my friend & I built them in parallel).


Can anyone tell me which BIOS setting on this board requires the "6"?

Anyone have any ideas about solving the problems described?

Thanks in advance!

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Also, here are the BIOS settings I believe to be relevant:


DRAM Timing Selectable: Manual

DRAM Clock: DDR400

DRAM Command Rate: 1T

CAS Latency Time: 2

RAS# to CAS# Delay: 2

Min. RAS# Active Time: 10

RAS# Prelaunch Time: 3

Row Cycle Time: 12

Row Refresh Time: 14

RAS# to RAS# Delay: 2

Write Recovery Time: 3

Write to Read Delay: 2

Read to Write Delay: 3


CPU Voltage: 1.550 (up from 1.500)

GP VDDQ Voltage: 1.55

DDR SDRAM Voltage: 2.8 (up from 2.7, and it the BIOS doesn’t seem to provide any higher setting)

NB Voltage: 1.6 (up from 1.55)

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All right, we have progress!

At T2 and 400 it boots into XP.


The next question - what are optimal settings for BIOS, given this?

What have I sacrificed, in practical terms, in moving from T1 to T2?


(As a note - the machine does seem palpably, if slightly, faster.)

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  • Corsair Employees

Command Rate will have to be 2T with more than 2 modules installed with that MB.


Command Rate is not really a memory setting and would be dependent on the make and model of MB and PSU and the specific CPU you have installed. You might look this/those setting /'s up on the BIOS Optimization Guide at Techarp and get a better explanation.
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I guess I'm asking whether more memory at slower settings is a net gain, and if so, how much of a gain.


Also, you did recommend the 2-3-3-6 (if I remember correctly, which isn't key here) - but I have to admit that I'm not clear on which of the BIOS options listed above takes the "6".


And I thought that the recommendations might change a little with the 400-&-raised-voltage scenario.


And that you might have recommendations regarding the other settings, beyond those four numbers.


Again, my appreciation!

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The memory will have to be slowed down with more than two modules installed if for example you have 4 CMX512-3200XL modules installed DDR333 would be suggested and the suggested settings would be Cas 2.5-3-3-7 but you might get them to run at Cas 2-3-3-6 (Cas, TRCD, TRP, TRAS)
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