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X38 limits w/ DDR3?

C

CrispySilicon

n00b
Joined
Oct 15, 2013
Messages
8
hwinfo.jpg


CPU is actually an X3363, but same specs. VDIMM is at 1.68V.

I'm stuck at 450FSB, I can get to 475 by jacking voltages up across the board, but little gain for the increases so staying at 450.

I'm trying to get the timings tighter. I tried to apply the timings in the picture above to 1800 by multiplying by 0.75, but have been unsuccessful at getting the system stable with those settings (do timings even translate like that?). Performance level is 7, I've tried raising it to 10, no gain in stability, but setting 6 is no-go.

If I drop the CL to 8, I'll get an eventual bluescreen unless I raise MCH voltage a touch. At max overvolt (+0.375MCH +0.350 VTT ) I can set CL 7 and it's stable.

The problem is, according to Intel, even stock volts is above the safe max for long-term operation on X38 (stock volts being +0.200), so I'm not enthusiastic about raising it higher, and I'm tuning this for 24/7 use, want at least two years of life from it.

I went for overkill with the northbridge cooling, it's got a thermalright HR-55 with 2x 80mm fans strapped to it and liquid ultra between. So temperatures should be okay regardless.

So should I just be happy with what I have now? Or will the MCH survive long term with voltage that high? Or am I just at the limit of what X38 will do and pushing really hard for nothing?
 
Expensive high speed RAM on a LGA775 platform with a GeForce 9300, and you want to keep it for 2 years... for what purpose are you doing this for?
 
Ignore the 9300. It's just a junk card I stuck in there until my card comes back from warranty.

I'm doing it because I thought the whole 771 in a 775 platform thing was a novel idea, and I went with that RAM just to see how far the X38 could go. Also figured I could reuse it in two years, if not, at least it will still resell pretty easy.
 
Sandy Bridge and Ivy Bridge for the most part do not benefit from RAM faster than 1600 mhz CAS 9. Haswell does not benefit from RAM faster than 1866 mhz CAS 9. If we take this in reverse to LGA775, I'm fairly sure the benefits of overclocking RAM that high is much less.
 
Yup. Which is why I'm working on timings, not looking for more frequency. I'm keeping the RAM divider where it is because this is where it's most responsive.

I've tried dropping the divider and moving the performance level, but even with reduced timings, this is still the sweet spot so far.

The question is whether or not it's a problem with the MCH being at it's limits, and if I can push it harder reliably at higher voltage.
 
CAS 9 refers to the timings. Faster (lower) than CAS 9 at 1800 mhz will net you very little benefit.
 
Well, I got it all sorted out using stock voltage, just needed a few more tweaks here and there. And no, the timings don't translate directly using simple math, I had to do it by the ns ratings,

Just for reference in case anyone ever looks this up, I managed to get the timings a bit tighter.

Now running 7-9-9-24 @ 1800

Maxx_MEM2_d1829.jpg


Bravo X38, bravo!
 
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