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Errors only with 4 sticks of ram

post #1 of 9
Thread Starter 
Hey all,

I am running 4 sticks of 2gb G.Skill eco and getting errors in memtest (specifically at test 5). I have tested two stick at a time and ran 5 passes without errors (when there were errors it happened the first pass and every pass at test 5). I figure it is a problem with 4 sticks not getting enough voltage. I heard that this can happen with g.skill ecos in an AMD system. Was hoping someone could give me an indication of how to find the right voltage and timing.

The ram is 1600mhz, with timings 7-8-7-24, and supposed to be at 1.35 voltz. I heard that I might need to run at 1.6 voltz, but wanted to ask here what is the best practice. Do I need to do gradual increments and run memtest each time or what. Assume I am a total newbie at changing voltages.

And obv, my rig is in my sig.
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post #2 of 9
CPU/NB generally needs a slight bump.
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post #3 of 9
Thread Starter 
Quote:
Originally Posted by beers View Post
CPU/NB generally needs a slight bump.
Ah, I hadn't considered that. Why would that be an issue with 4 sticks?
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post #4 of 9
g skill recommend a 240 FSB,multi to match 1600 and 1.5v.
http://www.gskill.us/forum/showthread.php?t=7688

beers is correct,you will need a voltage bump on the CPU-NB for 4 DIMMS.
This is down to AMD's IMC and is common.
Remember to set your cpu and ht multi's to your current clock state,it also wouldnt hurt to OC your NB while your there. 2600+ yields good real world results
Edited by B NEGATIVE - 5/15/11 at 8:05am
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post #5 of 9
Quote:
Originally Posted by Aziraphael View Post
Ah, I hadn't considered that. Why would that be an issue with 4 sticks?
The Northbridge and/or MCH has more addresses and more modules to address/refresh/keep track of and so on. If you had tweaked your CPU/MCH voltage for two modules, and add two more and also have double the amount, you'll often need more than what was "just enough" before.
post #6 of 9
Thread Starter 
Quote:
Originally Posted by B NEGATIVE View Post
g skill recommend a 240 FSB,multi to match 1600 and 1.5v.
http://www.gskill.us/forum/showthread.php?t=7688

beers is correct,you will need a voltage bump on the CPU-NB for 4 DIMMS.
This is down to AMD's IMC and is common.
Remember to set your cpu and ht multi's to your current clock state,it also wouldnt hurt to OC your NB while your there. 2600+ yields good real world results
Ah ok, well I am going to go and read about all those acronyms you just used and then have a look at it

I was planning on getting everything stable before fiddling with the cpu speeds, but looks like that is going to be part of getting it stable in the first place.
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post #7 of 9
Test 5 is usually instability
Either a small bump in RAM voltage (i.e. to 1.4V) or CUP-NB voltage (since you run 4 DIMMs) should solve it

Better yet go big, pump 1.5-1.6V (still safe on this kit), and lower the timings to 6-8-6 and fly

Using a 240 bus clock is really not necessary, the x8 multiplier should work no differently. A lot of what G.Skill says to "help" AMD users is bull, they don't really cater to AMD users, espsecially those using anything above the G.Skill DDR3-1600 CL9 kits - telling them to buy overpriced G.Skill Flares that are no better. For some proof, check this out:
Quote:
For DDR3-1600 CL9 kits, you can also attempt DDR3-1333 CL8 (8-8-8-24) 1.50V and this would be just as fast without needing to overclock the system. These are also good settings if you can not get DDR3-1600 to work, and you need fail-proof settings (without overclocking) to test the memory and make sure they are working properly.
I'm waiting on someone like IOSEFINI to come in here and prove this wrong. Even DDR3-1333 at CL7 falls slightly short of 1600 CL9 (though they are about equal otherwise). From my experience AMD DDR3 performance scaling actually degrades below 1600Mhz; whereas 1600 at CL7-7-7 (or 6-8-6) can come really close to 1866-2000 at CL9, apply the CL7 and CL9 timings but use 1333 and 1600 as the respective speeds; 1333 CL7 still falls slightly short, and it's a smaller 266Mhz gap vs 400Mhz gap.
Edited by xd_1771 - 5/15/11 at 11:12am
post #8 of 9
Thread Starter 
Thanks a lot guys, particularly xd_1771 for an, as always, informative and helpful post. I don't know what I would do without this place.

I'll try ram voltage first and look into the CPU-NB as I would prefer to learn a bit more about OCing before I fiddle with that. Also because I have the 880G extreme3, the only 8+2 MOBO that has had a reported failure due to voltage. Probably by someone pushing it a lot further than I would, but still.
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post #9 of 9
There have been other 8+2 failures since.... seemingly once in awhile random failures. OC with caution, but don't necessarily limit yourself that much!
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