Run CT25664AA1067 at 1066

darwinjob · Dec 22, 2013

Hi
I have 4 of these: http://www.crucial.com/store/partspecs.aspx?IMODULE=CT25664AA1067 and I would like to run it, as advertised, as PC2-8500 at 1066. Cpuz reports the following:
Jedec#1 333
Jedec#2 400
Jedec#3 555
There is no 533!!! How is this memory supposed to run 1066/PC2-8500 then? Or, more practically, can it run at 1066? What timings should I try?

Tradesman1 · Dec 23, 2013

If not running at 1066, manually set the freq, base timings to spec along with the DRAM voltage and should be fine

darwinjob · Dec 26, 2013

Tradesman1 :

If I set everything to auto it runs at 800 - no problem. If manually set the freq to 533 leaving everything else auto Windows freezes after half a minute. As you've said, I have to set the proper timings, but how shoul I know them since there is no jedec 533?
http://s25.postimg.org/o7w2l62tr/no533.png
I've tried to use the timings from 555 - no luck.

Tradesman1 · Dec 26, 2013

The DRAM voltage should be 1.8 try at 1.85 and raise the MC voltage a tad - don't know what you have, so if Intel based, guessing it's a 775 which is prob the NB voltage - raise it + 0.06, if an AMD rig, it's prob the CPU/NB voltage try raising that + 0.075

darwinjob · Dec 27, 2013

Tradesman1 :

Thanks for the advise! You mean I should use the timings from jedec 555? 7-8-8-25-33?
The mb is http://www.asrock.com/mb/AMD/M3A-GLAN/ with am2+ 9550 x4 phenom cpu.
I'll try to increase the voltage.

So far it runs ok at 800 with everything set to auto:
http://s25.postimg.org/8axaogafj/20131227_020404.jpg

if I force the freq only (the rest is auto) to 533 it fails:
http://s25.postimg.org/nxok1to7j/20131227_020259.jpg

Tradesman1 · Dec 27, 2013

Might try a pinch more voltage or it just might not be able to run at that

darwinjob · Jan 14, 2014

No luck

RMA.
A weird observation: it is much more stable in Unganged then in Ganged mode.

Tradesman1 · Jan 14, 2014

INteresting, sounds like the sticks just don't want to play nice

dronson · Mar 6, 2014

Hi darwinjob,

Check your motherboard specifications for DIMM modules per channel....
How many you can install.
I have the same memory but my motherboard supports only 1 DIMM per channel at 1066Mhz.
So in my case there is no chance to boost it up to the 1066Mhz only 800Mhz.
And one more downside of this memory,that you can't increase the voltage,otherwise you kill it.

Specs.

GA-MA78G-DS3H
AMD Phenom x6 1055t
Crucial CT25664AA1067.K16F

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Run CT25664AA1067 at 1066

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