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Crucial won't go 4-4-4-12

Last response: in Overclocking
January 10, 2008 1:07:45 AM

I'm using 2 sticks of Crucial PC6400 at 800MHz. Here's the setup:

Q6600 - settings 333x9
Abit P35-Pro
2.0G Corsair RAM DDR-2 PC6400
(2) 500G Western Digital drives (sata)
Sony DVD/CDRW (sata)
(5) 80mm case cooling fans
CPU Temps always in the 40's

First, the ABIT board has it's lowest setting on the last number, of 15. But when I set the RAM at 4-4-4-15, she won't boot. The RAM is marked right on it, 2.1V and 4,4,4,12

Is this a limitation of my board's settings? This board is brand new as of today, I RMA'd the one that was losing video and crashing all the time. Also upgraded to the GE Force 8800GT 512, over the 8600 256 that I had in the original MB that I returned.

I am running the RAM at 2.15V and the CPU at 1.3 FWIW.

More about : crucial

January 11, 2008 4:33:26 AM

which is it Crucial or Corsair?

You'll probably fin the IP35 Pro undervolting the RAM slightly so that your 2.15V setting may in fact be a true 2.10V.

If it's Crucial Ballistix 6400 it's rated for 2.2V @DDR2 800 4-4-4-
January 28, 2008 11:29:07 PM

Change TRP to 2T only then it will boot!
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February 4, 2008 8:52:27 PM

turn the voltage up on the MCH a bit
February 5, 2008 9:23:29 AM

wow wow wow....stop

Is it Crucial or Corsair??

Did you go to DDR2 voltage and increase it to 2.1v
If so....then something is wrong and you should run memtest of a boot CD
June 25, 2008 2:16:30 AM

I have same problem with Corair xms2 pc6400
June 25, 2008 3:04:09 AM

Isn't that a huge overclock for a Q6600? Maybe it's not your ram. try it 5-5-5-15 or change to 667mhz for 1 to 1 ratio, or change multiplier to 8, fsb voltage?........prime95 for a few hours..................was this ever stable at 3.0 ghz?

What happens to your timings with no overclock?

You could also try one stick at a bad apple spoils the barrel.

Whichever- ram crucial 2,2v or corsair 2.1v you are 1/2 a 10th away from specs.
June 26, 2008 6:30:40 AM

Hello, I have 2GB of Crucial ballistix 800mhz and they run 4 4 4 12 @ 2.2v fine, These timings and voltages have to be put in manually in bios, But be advised though because i had to RMA two sets of Crucial ballistix before i had a good pair so test one stick at a time. Whatever you do please leave the setting at 2T and not 1T.

July 28, 2008 7:31:18 AM

I can run 6400 crrucial 2x1 gig kit at 1069mhz-5,5,5,15, 1.86vdimm OR 800mhz-4,4,4,12 at 1.86vdimm. 2t and all other memory settings at "auto" on ASUS P5-E. Memtest one stick at a time at a lower voltage and work up to but not over default voltage.
July 28, 2008 4:04:59 PM

I have 4 GB of Corsair XMS DDR2-800 (Rated @ 5-5-5-18)
Another 4 Gigs on the way.

Heard reviews stating that the timings of these ram sticks have been successfully reduced. One even stated he got his to 4-4-4-12.

I am interested to see what I can do with this stuff. Going to be a challenge with 8 Gigs though.

I may be replacing it fairly quickly with some Patriot ram with quicker delay timings.

No big deal if I swap it out for better. I payed $160 bucks for the 8 Gigs of Ram... That's a drop in the bucket when considering I am spending $3000 on this build.

- Witt