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Ok on SmallFFT and LargeFFT, but failing blend - Page 2

post #11 of 14
Quote:
Originally Posted by apesterin View Post
Sorry, I should have mentioned. I have these (all PC2-6400):
2x2GB A-Data Gaming Series 5-5-5-12 @1.9-2.1v (part AX2U800GB2G5-CG) - slots 1/3
2x2GB OCZ Gold Series 5-5-5-15 @1.8v (part OCZ2G8002G) - slots 2/4
It is never wise to use two different types of RAM.
Even though the specs might be the same, it will most likely not run optimal.
In your case, even the specifications of the two types are not the same, thus one of them may not run as it should.

Quote:
I am not sure what you mean by CPU MP. I have the host clock set at 450MHz, and the RAM at 1:1 is getting at 450MHz. Or do you mean to go back on my CPU/FSB overclock and stress the RAM in isolation? That sounds like a good suggestion if you can confirm

I was more worried about the CPU Termination / MCH and RAM voltages. Do you think any of these is getting over the board right now? Also, do you recommend I keep the timings as relaxed as 6-6-6-18 for further testing?
CPU MP = CPU multiplier.
If you lower just this, and keep the rest of your settings the same, you are excluding the CPU from failing in a stresstest.
In this way you will be testing your RAM modules for if you have a stable OC.
What I would advise you is to take out one kind of RAM modules, and test just with the other.
Wich one you take out isn't really an issue now Later you could switch to whichever modules you'd like.

I must admit, it has been quite some time since my own LGA775 platform so I cant say for shure if the voltages that you are doubting are good, but they seem fine to me. Fine in a way that they shouldn't cause instabillity, maybe they're a bit high, but can't really recall.
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post #12 of 14
Thread Starter 
Sorry, I can only report back once a day after work. Besides testing each iteration takes time

So I took a mix of suggestions provided and had some success with the following:
1. Reduced the FSB to 440 temporarily
2. Reduced RAM voltage to 1.94, leaving it at 1:1 (880)
3. Changed timings to 5-5-6-24 (was tempted to try tighter and see)
4. Reduced CPU Termination to 1.3 - not sure but I think this or RAM volt was causing BIOS warnings

I could get blend running for 10+ hours (I stopped it there). So at least I am at a somewhat stable state now

I reduced the FSB because I didn't understand SandersAce's advise yesterday. Stressing the RAM with a lower multiplier sounds like a good approach, so I will try that and see what my RAM can take

I know mixing RAMs isn't the best approach, but for now I am stuck with this combo. I bought the 2 sets at different times and didn't have any clue about overclocking back then. Now at my place its really hard to get the same DDR2 sticks, so I would rather persist with what I have and use this learning whrn I build my next machine. I think I am OK with taking out a pair just to isolate and test though

I will play around for next few days and come back with updates or questions. Thanks for the suggestions so far, really helpful
Edited by apesterin - 12/21/10 at 7:28am
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post #13 of 14
If you want to use both sets of RAM modules together, you could seperatly test them, and find frequency and latency settings that work for both, at a common voltage.

But that takes some time, so you could also stick all four of them in and begin a trial & error test of what works

Good luck with everything
Edited by SandersAce - 12/21/10 at 7:59am
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post #14 of 14
what others have said. i would get rid of 1 of the brands of ram and replace it with the identical of the other.
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