Corsair PC4000 pro problem

[robsession]

Ok, so I got my 2.4c MO chip running at 280 fsb but the only catch is that for some reason I am only able to run with a 3/2 ratio. I have tried 5/4 and also 1/1 and they both make my computer freeze. I have also tried raising my memory voltage all the way up to 3.1 and I get the same result. Anyone using this same memory at this fsb with any tips on how to get it to work at 5/4 or even 1/1? I have also tried 270 fsb at 5/4 and 1/1 and still doesn't work.

[thirdeye]

what is highest it will do 1:1 and 5:4?

[robsession]

I'm not sure but with Geil pc4200 it ran stable at 275 fsb at 1/1 so I am thinking I might need new ram but I would hate to have to give up this ram.

[thirdeye]

to assist we need information. if it wont run 1:1 @ 250 then you know you have a RAM prob or mobo incompat.
finding a stable fsb with your CPU, mobo and new RAM will take testing.
please test diff fsb in bios and furnish this info if you need help.

[robsession]

Ok so the highest I got with 1/1 was 261 fsb and 274 with a 5/4 ratio . Both with a 3.0 volts

[oc-rookie]

Have you done the vtt mod to your max3?

[robsession]

NO why?

[thirdeye]

the VTT mod stabilises vdimm voltage, at higher volts its necessary. running DDR500 1:1will need more volts, at least @ 280.

[oc-rookie]

Your vtt is off for all the settings above 2.8v. 2.9-3.2 are useless. If you are able to get into windows with any of those settings, as soon as you put a load on the ram it will most likey fail on you.

You can stabilize vdimm by removing mc64. But vtt values are off until you cut a trace and trick the windbond chip into outputing more vtt.

[robsession]

How do I do the vtt mod? Do you think that is my problem?

[oc-rookie]

Can you mod? If not pm me.

Here's the thread. http://www.xtremesystems.org/showthread.php?s=&threadid=23084

There's also Hipros mods. http://www.xtremesystems.org/showthread.php?s=&threadid=28553

GL