[stephenmv]

I am trying to adjust my latency settings to 4 in Bios (default is 5, 5-5-5-18). Whenever I change it to 4-4-4-12 my computer won't boot up. Do I also need to adjust the Advanced Timing Control settings?

Mobo: Gigabyte GA-P35-DS3L rev 2
Memory: Crucial Ballistix DDR2-6400 2.0V

Edited by stephenmv, 19 August 2009 - 11:59 AM.

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No, but you do need to change the voltage the RAM is getting to 2.0V.

[stettybet0]

No, but you do need to change the voltage the RAM is getting to 2.0V.

[stephenmv]

I thought the default setting was 2.

[stettybet0]

The default JEDEC specification for DDR2 voltage is 1.8V. Most motherboards will default to that.

[stephenmv]

I'm not seeing where JEDEC is listed. Should I just change the one memory voltage setting to +.2, the Ram settings to 4-4-4-12 and leave everything else alone?

[stettybet0]

The JEDEC standard is a document viewable here. It won't say JEDEC in your BIOS. It should say what voltage your RAM is currently getting somewhere. For example, in my BIOS, it's under System Monitor. You should verify the amount of voltage your RAM is currently getting, because not all motherboards default to 1.8V.

[stephenmv]

WOW, that document made this very easy to understand.

I am 99% positive that my boards default setting is 1.8. I didn't change the voltage settings when I changed my ram to their 4-4-4-12 setting and my computer wouldn't boot up. Would it be the voltage setting that would cause this or another timing setting?

[stettybet0]

You almost certainly need to change the voltage in order to make your computer boot with the timings at 4-4-4-12. However, without knowing how much voltage your RAM is currently getting, setting the RAM voltage to +0.2V may give your RAM too much voltage. This is because many boards default to 1.85V, and +0.2V will give you 2.05V.

Again, it should be pretty simple to see what voltage your RAM is getting. In some BIOSes, it's listed under PC Health Status.

[stephenmv]

Thank you, it is a good thing I checked. It is currently running at 1.88, so I take it I should just do +.1

[stettybet0]

I've been doing some research on your board, and apparently, +0.1V doesn't mean +0.1V... It may only add ~0.05V...

So, what I'd do is add +0.1V, and then check again to see what voltage is being reported. If it's 1.98V, then you're probably fine and you should leave it. If it's below 1.95V, you may want to go to +0.2V.

After you have that squared away, try to boot up and let us know how it goes.

[stephenmv]

I tried it and changed my settings to 4-4-4-12 and my system wouldn't boot up.

Edited by stephenmv, 20 August 2009 - 02:34 PM.

[stephenmv]

Bump... Sorry, just wanted to make sure this isn't lost.

[Troy]

Can you provide a link to the Crucial website's page for your exact RAM?

Troy

[stephenmv]

Crucial Ballistix

[Troy]

I have a very similar setup for my home system, I'll have a look at my settings when I get home and report them here if there's something else we need to adjust.