Cant run Ram at full speed

[Darth_Terra1]

Hi I wonder if any one can help here, I cant get the ram to run at full speed If i do the PC locks up after 15-20 mins and then i have to press the reset button on the base unit, after i do this the PC will work perfectly fine for the remainder of the time it's used until I power off in which case it will freeze again like before upon first boot.

I thought at first it might be a heat problem but as i say it's only the first 15-20 mins on first boot up that is the problem i would guess if it were heat related it would be every 15-20mins not just the first boot up am i wrong ? , I checked temps using the motherboard utility and via bios and all temps and fan speeds are as they should be.

I'm currently running the Ram underclocked at 750mhz as this seems to not cause the lockup but surly i should be able to run it at full speed, is this a motherboard problem that cant be fixed or is there any settings that are not right that can fix the problem, I have everything in the bios on auto except for the ram frequency as i said i had to underclock.

Specs are below if you need more please ask and if this is in the wrong part of the forum mods feel free to move.

Intel core 2 duo 2.66
2GB Corsair DDR2 800mhz
N650SLI-DS4 motherboard ( bios updated to latest version)
Nvidia Gforce 8800GTs (320mb) running in the PCIE 16x slot
550 watt power supply
Xp home SP2

all drivers are latest versions.

 

[Didou]

Are you running the memory at the proper voltage ?

 

[Tedster]

set you settings to auto in BIOS.

 

[Darth_Terra1]

set you settings to auto in BIOS.

all settings are at auto except the Memory frequency which i had to lower so the Pc wouldn't lock up, if mem frequency is at auto (800mhz) it locks up as described in my post.

 

[Darth_Terra1]

Are you running the memory at the proper voltage ?

the voltages are on auto so i would guess it is. should i change this or leave as is. ?

 

[Didou]

Since AUTO does not seem to work, find the spec sheets for your memory, find the part mentioning the recommended the voltage, set that value in your BIOS & set the memory speed back to 800MHz.

 

[Darth_Terra1]

hmm it seems the motherboard supports 1.8v Ram, but looking at the specs on the corsair site the Ram is 1.9v , could this be the problem, i'm not sure if the motherboard will allow the voltage to be changed to that amount or if it did any damage to the board or ram would be done.

 

[Didou]

Some motherboards do not allow voltage adjustments. I am in the same situation as you as my motherboard (Intel DP965LT) supports DDR-II 800MHz but only at the JEDEC specification which is 1.8V. I've bought Corsair XMS memory which requires 1.9V but have lucked out since they run properly at 800MHz at the default timings & pass memtest for days.

*edit: if you never get this memory working properly Crucial has PC6400 memory rated for 1.8V operations HERE, HERE & HERE*

 

[Darth_Terra1]

Thanks for your help didou, I have emailed both gigabyte and Crucial with the problem. i'll see what they have to say about whether it's possible to run the Ram, but i'm thinking i might have to replace the ram for 1.8v operations.

 

[Didou]

Out of curiosity which Crucial were you currently running ? Most Crucial ram is rated for 1.8V operations unless you were using ram of the Ballistix type.

 

[Darth_Terra1]

my mistake it's corsair ram not crucial

The part number is CM2X1024-6400

and it's type is Corsiar DDR2-SDRAM PC2-6400 that's all i know about it

 

[Darth_Terra1]

well i have spoken to gigabyte and they say that the motherboard DDR2 voltage can be changed so i could put it up from 1.8v to 1.9v which is what the ram requires but i'm not sure if this will cause any problems, i would have thought upping the voltage would reduce the lifespan of the ram, is this something i should do or just leave it underclocked. thanks for any advice

 

[Didou]

It is rated to run at that voltage so no harm will come from it. Corsair tests the reliability of its parts at the required voltage & would not recommend for users to set it to that value if it would end up damaging the part (especially during the warranty period).

 

[tgf_trust]

I have run into some of the same problems as you with the Corsair CM2X1024-6400 memory. I am using the Gigabyte N650DLI-DS4 MB, and have had to adjust voltage (+0.100v), and memory timings to make these sticks function. I had found on another BBS, that by keying CNTL-F1 in the main BIOS screen, I have more administrative options in BIOS, and was able to change my memory timings from 5-5-5-18 to 5-5-5-12, which is what is stated on my sticks. My problem is that I cannot get (4) sticks to run on the MB without lockups. (This is Dual Channel Memory Configuration on this MB.) I created a service ticket at Corsair, and they gave me an RMA to return the memory. The recommend memory specs on the MB on Gigabyte site, list a CM2X1024-6400C4, which is not the same part as mine. I would prefer not to return the sticks. I would like to think that someone out in Googleland has been able to make these two pairings function properly. Any assistance or recommendations would be appreciated.