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Exalix 09-01-2006 10:03 AM

Asus P5W DH Deluxe & Twin2x2048 PC8500C5

Am I the only one here who can't get the Twin2x2048 PC8500C5 to run at their rated speed/timings on the P5W DH Deluxe motherboard.
I simply can't get it to run stable at DDR 1067MHz (1:2)
How much voltage am I supposed to give the modules at their rated speed/timings? I've tried 2.2V but no luck.

Exalix 09-02-2006 07:37 AM

Am I really the only one?

Ok, I finally got the time to test the memory with memtest165.

My TWIN2X2048-8500C5 hits the wall at 1042MHz 5-5-5-15. memstest runs for approx. 5 sec. and the errors just continues on and on.

The best setting I can run these modules at, is 999MHz 4-5-5-15. That suckz, not exactly what I expected for these very expensive modules.

I run the modules at 2.2V.

Are these bad parts?

Or, should I return them(14 day return policy in Denmark), and get the TWIN2X2048-PC6400C3 modules instead?

According to, PC6400C3 should be able to run even faster and with better timings.

My current sys. spec.:

Intel Core2 Duo E6600 @ 3.0 (9*333)
Corsair Twin2x2048-PC8500C5 running 999MHz *(2:3) 4-5-5-15
Asus P5W DH Deluxe
Gigabyte 7950GX2
Enermax Liberty 500W

My goal was, but not possible:
Intel Core2 Duo E6600 @ 3.2GHz (9*356)
Corsair Twin2x2048-PC8500 running 1067MHz *(2:3), RATED SPEED(WHAT I PAID FOR)

*The 2:3 is the divider for PC800 when running 266FSB

If you are about to ask me, if I can run 1:2 divider with FSB at 266, nope not possible either.
So with everything at stock speed, I'm NOT able to run a PC8500 system.

Muttley59 09-02-2006 10:05 AM

I have a very simaler setup

Intel Core2 Duo Extreme Edition X6800
Corsair Twin2x2048-PC8500C5
Asus P5W DH Deluxe
EVGA GeForce 7900 GTX 512MB GDDR3
Tagan TG1100-U95 1100W ATX2.01 Turbojet Quad SLi
Creative Sound Blaster X-Fi Elite Pro

Its been over 3 years since i built a pc .... was told this was the best mem for this mobo ....... so i would be very interested to see if there is an answer to your problem :):

DSebring 09-02-2006 09:24 PM

Well I have a similar problem.

P5W DH Deluxe
Core2 6600
2x CM2X1024-6400C4

I have tried everything and this RAM simply will not run stable at the rated speeds of 2.1v

Most stable setup I have been able to get so far is to use the BIOS overclocking at 1333FSB DDR2667, even that's had a few issues.

Every other manual config I have tried fails Prime very quickly or reboots the machine.

So far I am not very happy with this RAM.

Exalix 09-05-2006 04:01 AM

Would be reeeaaally nice if Ram Guy would take a look at my problem

RAM GUY 09-05-2006 12:58 PM

We have not been able to hit 1066MHZ on the 975 chipsets only 965. About 1000MHZ>< is about average.

Exalix 09-05-2006 02:58 PM

RAM Guy, thanx for the reply.

OK! That really surprises me!
What about all the websites who reviewed the 8500C5 dimms, they where able to hit speeds around and beyond 1100MHz. Are they lying? Most of them are using 975X based P5W DH Deluxe...
Heres an example:

And those sites made my final buying decisions.

So what about the 6400C3 dimms? Aren't they able to hit the 1066MHz on 975X? Check the link before answer that question....

RAM GUY 09-06-2006 07:12 PM

Just verified with our LAB guys and ASUS peak on this motherboard is 1000MHZ><. You may want to email the reviewers on how they got their results, but this is our straight up honest answer.

Wired 09-06-2006 07:45 PM


Originally Posted by RAM GUY (Post 261241)
Just verified with our LAB guys and ASUS peak on this motherboard is 1000MHZ><. You may want to email the reviewers on how they got their results, but this is our straight up honest answer.


CPU Ratio                | Memory Speed | Best Memory Timings / (Voltage)
Highest Mem Speed (1:2)  |    1104 DDR2 |    5-5-5-15  2.35V

by voiding the warranty apparently :)

eva2000 09-08-2006 01:59 PM

simple fact Asus P5W DH needs a bios update to open up additional memory timings available in memset as the key to clocking memory and fsb higher in async dividers for core 2 duo is tRFC and tRD values and some more vMCH and vdimm volts in some cases.

take a read of my testing on P5W DH that Asus provided me at and divider testing

good news is Asus are working on exactly such a bios to open up additional memory timings like they did for P5B DX board :)

I have no probs taking PC6400 Micron D9GMH based memory to 501-513mhz 4-4-4-8 at 2.2v or 540mhz 4-4-4-8 or 555mhz 5-5-5-5 at 2.4v on P5W DH with E6600 or E6700 after tweaking memset timings for tRD and tRFC


Placid666 09-08-2006 11:51 PM

This board really needs bios work as eva2000 posted.

The memory qualification info for the Twinx/XMS2-8500/C5 posted here
shows 1T/2T: 2T

On the asus p5w-dh when in by spd mode the cmd rate is always set to 1T per sisoftware sandra 2007 and same in manual timing mode with no way in in bios to change it.

Robolf 09-09-2006 05:41 PM

There seem to be many problems overclocking this board over those frequencys like the board is changing its bootstrap (not sure yet on what this is) as reported on the xtremesystems forum.

Maybe have a look there and/or post your problem, odds are the ram is fine but as yet with high FSB the board is doing something and trying to be clever which is causing the problem.

PS I take it disabling Hyper Path 3 doesnt make any difference?


eva2000 09-10-2006 12:24 PM

the P5W DH just needs some tender loving care and it clocks fine Not allowed please see the forum rules and Not allowed please see the forum rules

Robolf 09-10-2006 01:53 PM

Thats pretty impressive mate.

Is that really 128C chip temp?


Muttley59 09-11-2006 06:48 AM

my question is what is the best ram to use with this mobo bearing in mind i am not overclocking just want it to be quick without muckin about with it i have Rma'd my Corsair Twin2x2048-PC8500C5 and my knowlege with bois settings isnt good ,,,,,,, so if someone can recomend the best ram for the 6800 extreme and the P5W Dh Deluxe it would be realy great :D:

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