MemTest vs Orthos

[Avrithor]

So I overclocked my sig rig recently, and came to an interesting bump. The best stable OC I can get to is 450x7=3.15GHz with the memory at 5-5-5-15 (stock), 12+ hours stable in Orthos. Unfortunately because of the available dividers on the DS3 BIOS, I'm stuck running my G.Skill DDR2-1000 at 900MHz (the next divider is 2.5 which puts it at 1125MHz, more than it can handle). So I figure, if I'm underclocking the memory I might be able to tighten the timings, right? Here's where I hit the snag. At 5-4-4-12 it passes MemTest with flying colors, multiple full passes and zero errors. But when I boot into Windows and run Orthos it errors after 3 minutes. I bumped the MCH voltage to +0.3 to see if that would help and it didn't. Any insight as to why it passes MemTest but not Orthos?

http://www.hardfolding.com/ftag1.php/mem/646607/53/0.png (http://www.hardfolding.com?go=38&tnum=33&id=646607)

[Turdpike]

Were you running blend test somehow? If you can't pass the 1024fft test, it's ussually your ram timings are too tight or it needs more voltage. Try increasing that voltage, since you've already bump the nb voltage. Next one to try is the vtt. Stay below 1.5V.

When you tweak your ram, it's always a good idea to loop memtest86+ test 5 for 8hrs before booting to windows. Heat that sucker until it produces error. Then do a blend test. If it errors, it's mostly due to chipset/cpu needing more voltage.