HOWTO: Overclock C2Q (Quads) and C2D (Duals) - A Guide v1.4

**NINaudio** · 07-09-2007, 10:19 AM

This is something that might vary by board, bios, and or chipset. Currently my setup says that I have ddr-266 ram because I'm using the 2:3 divider. I'm also fairly certain that it doesn't show the actual ram speed of my gf's DS3.

**Just Learnin'** · 07-09-2007, 10:28 AM

All I know is mine shows on post what it is running at. Maybe other boards BIOS's differ?

**NINaudio** · 07-09-2007, 10:33 AM

either way, I wouldn't worry about what the post screen says as long as it's running the right speed in Windows...

***ol'norton*** · 07-09-2007, 05:26 PM

Running 1:1 in 1066 strap is DDR2-533 PC4300
These only reflect actual frequency when at default 266 FSB
Your bios is showing you actual frequency in relation to the 333 FSB. DDR667, But it is not on the 667 divider, it is on the 533 divider ie 1:1
So at post your seeing the 1:1 divider (DDR2533) it is set to & not the actual frequency.

CPU-Z will show 333MHz (DDR2-667)

**aceshu** · 07-09-2007, 06:15 PM

Thanks ol'norton. Perfect explaination. Now I get it. Don't know what I'd do without bleedin edge. Thanks again!

**aceshu** · 07-10-2007, 02:43 PM

I've been overclocking for almost a week now, trying different settings. Currently I'm up to FSB350 @ DRAM700. That's the ole 1:1 thinging. My question would be, is it always better to have the 1:1 ratio or would setting my ram at it's rated speed of 800,and thereby changing the ratio, be any better?

***ol'norton*** · 07-10-2007, 03:03 PM

1:1 comes into it's own with 965/975 chipsets at higher fsb where you are starting to max out your NB. below 400FSB you would definately be better with your ram at higher frequency.
The P5B has it's 1st strap change at 401 FSB. where memory controller latencies are loosend to allow higher FSB. After that you will have to experiment for yourself with what works best with your setup.

**graysky** · 07-10-2007, 03:07 PM

Dunno if I agree with that... the C2D/C2Q based systems never use all the RAM speed. Do the experiment and report back.

***ol'norton*** · 07-10-2007, 03:13 PM

What do you mean by never use all the ram speed?

**Pointhore** · 07-10-2007, 04:37 PM

Originally Posted by graysky

Dunno if I agree with that... the C2D/C2Q based systems never use all the RAM speed. Do the experiment and report back.

I would definately like to hear this one.

***ol'norton*** · 07-10-2007, 11:59 PM

Aceshu, Run a 1M Super-Pi test on your current settings, Then set your ram on the DDR2-800 divider (for DDR2-875MHz) and run Super-Pi again.

Get Super-Pi from here:
http://www.xtremesystems.com/pi/index.php

**aceshu** · 07-11-2007, 08:37 AM

Here's what's happening. CPU and ram set at 1:1, FSB of 350, ram @ DDR2700. Ram timings at rated 4-4-4-15 @2.1V. CPU vcore @max for E6600 which is 1.325. Other voltages set @ minimum listed(not on auto). Ran orthos @these settings and alls well. Full load test temps never over 55c. Idle temps around 38c-41c. Now, when I try to set ram frequency to other than 1:1 ratio, my rig refuses to boot. Turned off psu, enter bios to set to 350 and 700 (1:1), everything is fine again. Question is, is it not letting me change to other than 1:1 because I have to clear the CMOS first?

**NINaudio** · 07-11-2007, 08:48 AM

you shouldn't need to clear the cmos to increase ram frequency. That's something that might be needed if changing to a different set of ram. Which ocz ram do you have?

First thing I'd try is to loosen the timings to 875mhz @ 5-5-5-15 and see if it boots.

Then if it does boot at that, and your ram can handle more volts, increase it to 2.2v and try to tighten the timings one at a time.