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Adding Additional RAM Has Thrown Off My OC - Page 3

post #21 of 27
Quote:
Originally Posted by NicoDemon View Post
From what I seen on the Corsair forums, the experts time and time again to never "add" additional ram. They only recommend that you add them as a "matched" set.
I tend to agree, however, I could not find a 8gb set of DDR2 ram for love nor money in Oz. I ended up getting 2 x 4Gb GSkills and that seems to be working a treat.

Where is it "iffy" is when you mix brands or different ram speeds with different voltage requirements. By the sound of it, the OP has the same brand and the same spec ram. Its problematic, but not impossible.

There is also the possibility that one or more of the sticks is faulty... hope not though

OP, Ive just noted your sig (RAM = 890MHz). Are you OCing them during testing? If so, return to stock, it not, my bad
Edited by Sethy666 - 8/22/11 at 5:54pm
post #22 of 27
Thread Starter 
I've got everything at stock for this testing. 890 for the ram and 1.3 for the NB are the OC values.

this is an identical set to the pair i initially installed. 2 matched pairs, first set in the yellows, 2nd set in the blacks.
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post #23 of 27
Quote:
Originally Posted by MillenniumSkies View Post
I've got everything at stock for this testing. 890 for the ram and 1.3 for the NB are the OC values.

this is an identical set to the pair i initially installed. 2 matched pairs, first set in the yellows, 2nd set in the blacks.
By rights, save a precocious ram stick, you should be good to go.

BTW, I had to hit my NBv up to 1.4v... just thought Id mention that
post #24 of 27
Thread Starter 
Ok here's where I stand:

12 hours of Memtest on new sticks @ stock settings - 0 errors.

I have reloaded my OC settings and then put the NBv up to 1.4.

Same problem. instant error running prime 95 blends.

I have noticed it always seems to be in a different core. Is that relevant?

Current RAM settings are:
1:1
890MHz (FSB @ 445)
5-5-5-18
tRFC = 52
CR = 2T
@ 2.1 volts
FSB to NB strap: 400MHz

Suggestions?
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post #25 of 27
Thread Starter 
most recent attempt: decreased tRFC to 55 from 52 (auto). The system ran blends for almost an hour before encountering an error.

Should I keep relaxing the tRFC or maybe lower the FSB a notch?
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post #26 of 27
Thread Starter 
Humpty Bump.

I have been trying everything I can think of to find a stable state. I am currently running blends with the following stats:
400*8.5 = 3.4GHz
Ram Freq = 800MHz
FSB Strap = 400
6-6-6-18
tRFC = 60
vcore = 1.4 (1.38 in CPU-Z)
NBv = 1.4
Pll = 1.6
FSBterm = 1.4
Dram Volt = 2.1
GTL = 0.61x


Any comments/suggestions/tips/warnings/wisdom please!!

Edit: The above failed after 2 hours of blends frown.gif
Edited by MillenniumSkies - 8/24/11 at 12:52pm
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post #27 of 27
Thread Starter 
Ok, well After about a million adjustments, I think I found something stable.
3.75GHz
Multi: 8.5
FSB: 440
PCI: 100
Dram Freq: 881MHz
tCL: 6
tRCD: 6
tRP: 6
tRAS: 18
tRRD:3
tRFC: 60
tWR: 6
tRTP: 3

Voltages:

Vcore: 1.38125 (1.360 in CPU-Z)
GTL: 0.65x
PLL: 1.56
FSBTerm: 1.28
Dram: 2.10
NB: 1.34
SB: 1.10
PCI: 1.50

This passed 6hrs of Prime95 Blends. I know thats not enough to claim total stability, but its certainly close. I will test more.
Temps are a touch on the high side. peaks were 75/69/68/71 (although they didn't spend much time that high). I'm going to try reseating my HS and reapplying the thermal paste; my first time probably wasn't great.

For other peoples benefit, the key lay in the GTL. OCing a Q9550 at these levels is apparently extremely reliant on GTL reference.
Also interesting note, I actually had to turn a few volts DOWN to get stability. NBv had to come down, so did PLL, FSBterm, and even Vcore! Also I guess auto strap is more appealing to the P5Q series of mobo, so that helped too.
The RAM timings kinda suck, but I feel like if that is the tradeoff for stability and not losing much of my FSB (only dropped it a net of 5 in the end), then I think I can live with that.

I will do longer testing to make sure it is really stable, then I'm going to see if I can tighten timings, and maybe claw back that 50MHz of core speed I gave up tongue.gif
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