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Phenom II x6 with four 1600/12800 RAM modules?

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petteyg359

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Jul 31, 2004
I've just got a set of 4x4GB, and at 1600, memtest fails during [Block move, 80 moves]. The system freezes at that point, instead of memtest showing the error in the list at the bottom, which makes me think it is a CPU problem, rather than the memory actually being bad. Also, at 1333, memtest has gotten past that section with no problems.

Is anybody running an x6 with 4x 1600 RAM sticks, and did you have to up the voltage to anything to make it work?
 
The CPU is only rated for two sticks of 1600 DDR3 Memory. The CPU-NB cannot handle 4 sticks of 1600.
 
^ Yup you will need to run those sticks at 1333 most likely.

They're running just fine at 1333. Was hoping somebody would have four sticks running at 1600 and know what voltage(s) might be bumped to make it work.
 
All defaults and auto (2T) at the moment. All sticks are the same. Two dual-channel 8GB sets. Don't know what program to use to see all the CPU voltages without rebooting. BIOS doesn't tell me what voltages it sets for auto. Steps on either side for cpu-nb are 1.174 and 1.177, and cpu-nb vdd is in .0125 increments, next step up is 1.1. RAM voltage is 1.6.
 
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Mixing of RAM kits even the same RAM kits is never recommended nor guaranteed to work.

You're asking a lot of the system but you can try 11-11-11-30 2T @ 1600 MHz with ~1.25v CPU-NB / VDDNB, with the RAM @ 1.65v.
 
Have a look at this threard. Running 4 dimms of 1600Mhz ram may require a notch or 2 increase in CPUNB voltage (aka IMC volatage), perhaps even a one notch bump in dram voltage. Should work no problem. Depending on the actual IC's on the ram you may or may not need to back off of stock timings, and 2T I would think is a guarantee (ie. no 1T).
 
Im running 8gigs of memory, four sticks @ 1600 mhz at 1.7v. Timings are 9-9-9-24 @ 1T. I had to up my CPU/NB voltage to 1.3v
If it seems worth it running that high of voltage then go for it. For me its working and my system is 100% stable for 24/7 use.
 
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All defaults and auto (2T) at the moment. All sticks are the same. Two dual-channel 8GB sets. Don't know what program to use to see all the CPU voltages without rebooting. BIOS doesn't tell me what voltages it sets for auto. Steps on either side for cpu-nb are 1.174 and 1.177, and cpu-nb vdd is in .0125 increments, next step up is 1.1. RAM voltage is 1.6.
Care to share a CPU-Z/Memory screen shot?

I'd add at least 0.05v to the RAM spec and maybe even 0.10v. Try 1.20v for the cpuNB though, IMO, that's pushing it.


You may never get 16 GB of RAM OC'ed at 800 MHz to work. That's a LOT of stress on the both the processor and the motherboard's power system ...
 
CPU-Z memory:
cpuzmem.png
 
First off I'd change to unganged mode instead of ganged - it could make a difference.

Didn't realize it was Geil RAM. :( Not the best choice for overclocking, IMO. You probably need 1.65-1.70v for the RAM at 800 MHz. DO the sticks show 9-9-9 @ 1.60v for 800 MHz???
 
First off I'd change to unganged mode instead of ganged - it could make a difference.

Didn't realize it was Geil RAM. :( Not the best choice for overclocking, IMO. You probably need 1.65-1.70v for the RAM at 800 MHz. DO the sticks show 9-9-9 @ 1.60v for 800 MHz???

I'm not trying to overclock them. I'm trying to run them at their rated stuff: 12800/1600 9-9-9-28 1.6v.
 
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Since you're running two pair you should set them at least 1.65v and probably 1.70v. I personally run +0.05 vDIMM on everything, even 2x1 GB, so +0.10v for 4x4 doesn't seem out of line at all and, in the end, the board may not support that much power to the RAM - maybe not even the 1.60v you need.

I'm not trying to overclock them. I'm trying to run them at their rated stuff: 12800/1600 9-9-9-28 1.6v.
Anything over the JEDEC spec is overclocked and I didn't see an 800 MHz JEDEC spec. I'm surprised there's even a spec for 740 MHz. On top of that all CPU's are only rated to run 667 MHz RAM - both AMD and Intel - so you're not only overclocking the RAM you're exceeding the CPU spec. I know we see CPU/RAM combinations running well over that all the time (usually at 2x2 GB or 2x4 Gb at most) but in actuality it's over spec and always has been. You're pushing the absolute limit by running 4x4 Gb at 800 MHz so you're going to have to make adjustments that are beyond normal.

From your board manual:
4 DDR3 DIMMs support DDR3 2133 *(OC)/ 1800 *(OC)/ 1600 *(OC)/ 1333/ 1066/ 800
SDRAM (total 16 GB Max)
 
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To get my four sticks of ram working @ 1600... i had to push a minimum of 1.7v to 1.75v to them
 
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