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4 x 1024 TWINX2048-4400PRO @ 275 1:1


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Hi Guys


I have 4 x 1024 Corsair TWINX2048-4400PRO that are running in a DFI SLI-DR Venus board ( Bios: 406-BTA )


I Just put in a FX-60 that goes stable @ up to 3080 MHz, so these memory are perfekt for the job, rated at 275 ( 3-4-4-8 2T )


FSB 275 1:1 x 11 = 3025 MHz :):




I cant get the memory to get stable in 3D applications at that speed and have to use 180 divider


I am using either default or Auto in all other settings than the rated timings, settings look like this...


DRAM Frequency (Mhz)= 180

Command per clock (CPC)= Disable

CAS Latency control (TCL) = 3.0

RAS# TO CAS# delay (TRCD)= 4

MinRAS# active time (TRAS)= 8

Row precharge time (TRP)= 4

Row cycle time (TRC)=

Row refresh cycle time (TRFC)=

Row to row delay (TRRD)=

Write recovery time (TWR)=

Write to read delay (TWTR)=

Read to write delay (TRWT)=

Refresh period (TREF)=

Odd Divisor Correct=

DRAM bank enterleave=



DQS skew control=

DQS skew value=

DRAM drive strength=

DRAM data drive strength=

Max async latency=

DRAM responce time=

Read preamble time=

Idlecycle limit=

Dynamic counter=

R/W Queue bypass=

Bypass max=

32 byte granalarity=


Any help would be very welkome



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The Default timings are fine for most settings. Your command per clock should be set at 2T.


Remember that you will not attain the kinds of memory overclocks with 4 dimm slots filled. It has been proven that the onchip memory controller of the A64 is wonky with 4 sticks filled and overclocks need to be dropped when this is the case. Try 3 - 4 - 4 - 12 with a 2T Command Per Clock rate.

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It's a tough call. What I would do is use memtest and superpi. Memtest for DOS and SuperPi for Windows.


Memtest will ensure stability at the timings you choose and SuperPi will allow you to see if the tweaking of the timings creates faster throughput of the data.


Test SuperPi at 2 X 1GB with your best timings. Then install the second set and begin to find your maximal plateau.


Different DRAM, different hardware can effect timings and thus you need to do this yourself.


Good luck and post your results back here. :D:


My personal advice? Remove the 2 X 1GB sticks. You didn't pay that much money to throttle your performance and that is what you are doing (in my opinion). Windows 32bit does not work all that well with the extra 2GB and only addresses 3GB at any rate. It's just not worth the loss of system performance for an extra GB that is seldomly used and when is used is quite slow. Photoshop with 2GB will render quicker than Photoshop with 3GB. The only difference will be if one had many, many steps backwards in very large photographic files. Even working on 3D Studio Max with map rendering does not show an increase in productivity with the extra sticks.

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First of all, thanks for your reply.


I have been wondering about the same thing myself, is it worth the ekstra memory.... :confused:


I allready ordered Vista but will 4 gig be an avantage here vs. 2 gig @ higher speeds?



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My personal opinion is that once Vista is released, the hardware manufacturers will begin the somewhat lengthy procedure of optimizing the hardware to the 4GB characteristic.


I personally will wait until this happens before my next move to DirectX 10, 4GB and Vista. I'm an enthusiast and I want my system running fast and well. Remember when Windows XP was first released? The issues with that OS for at least a year? The same thing will apply to Vista. I refuse to purchase a new buggy OS in exchange for a well working mature OS. When DirectX 10 games come out, well then yes, but it will be some time before DX10 game programming becomes either commonplace or a standard.


Anyone who moves to 4GB at this time, takes the event into their own hands. There is at this time, NO Support for 4GB other than forums like this where people try and help. Motherboard manufacturers at this time will not support the transition and there is NO guarentee that the 4GB will work either.

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I have gone back to only 2 x 1 Gig... :o:


I found these settings and I got one pass at 3DMark03 with those timings at 2.87 Vdim, seems like the higher voltage I give them the futher i get. But I only gave them up to 2.87 Volts because the next step is 2.92 ( and I don't dare go this high )


Timings are shown here, but from this site...





DRAM Frequency (Mhz)= 200

Command per clock (CPC)= Enabled

CAS Latency control (TCL) = 3.0

RAS# TO CAS# delay (TRCD)= 3

MinRAS# active time (TRAS)= 5

Row precharge time (TRP)= 2

Row cycle time (TRC)= 7

Row refresh cycle time (TRFC)= 14

Row to row delay (TRRD)= 3

Write recovery time (TWR)= 2

Write to read delay (TWTR)= 1

Read to write delay (TRWT)= 3

Refresh period (TREF)= 3120

Odd Divisor Correct= Disable

DRAM bank enterleave= Enable



DQS skew control= Auto

DQS skew value= 0

DRAM drive strength= Auto

DRAM data drive strength= Level 1 ( reduce 50% )

Max async latency= 08.0 ns

DRAM responce time= Normal

Read preamble time= 05.5 ns

Idlecycle limit= 016 Cycles

Dynamic counter= Disable

R/W Queue bypass= 16 X

Bypass max= 7 X

32 byte granalarity= Disable ( 4 Bursts )



Do I dare give them more than 2.87 Volts ?


What timings could I loosen, to get them stable?

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