8 gb on Asus p55 evo not stable

[ttom]

Hallo need help,

Model of the motherboard: asus p55 evo
Model of the memory: 8gb G Skill F3-12800CL9-2GBNQ
Model of the CPU: QuadCore Intel Core i7 860

Settings on 8gb:

RAM Timings:
CAS Latency (CL) 9T
RAS To CAS Delay (tRCD) 9T
RAS Precharge (tRP) 9T
RAS Active Time (tRAS) 25T
Row Refresh Cycle Time (tRFC) 88T
Command Rate (CR) 3T
RAS To RAS Delay (tRRD) 4T

Read To Precharge Delay (tRTP) 8T
Write To Precharge Delay (tWTP) 22T
Four Activate Window Delay (tFAW) 21T
CKE Min. Pulse Width (tCKE) 4T
Refresh Period (tREF) 640T
Round Trip Latency (tRTL) 53T

voltages:
ram 1,65 v
imc 1,25 v

Problems :
random freezes, bsod after 1min - 30 min from desktop or game

actions so far:
- tested all xmp profiles
- settings to 1600, 1333, 1066 all in auto only voltage higher settings.
- tested cpu voltage higher


on 4gb no problems system run stable, with all sticks tested. Also ram ok.

thank for your help.

[Tradesman]

tRAS = 24, Command Rate = 2, tRFC = 84, RAM voltage 1.8

[GSKILL TECH]

Test each set or each stick individually to make sure you don't have a bad stick in there.

Thank you
GSKILL SUPPORT

[ttom]

Hallo
thx for quick response

@ Gskill tech

"on 4gb no problems system run stable, with all sticks tested. Also ram ok."

see my first post.


@ gskill tech

DRAM Voltage: As with the LGA1366 CPUs, a maximum 0.5V difference between CPU uncore voltage and memory is advised. Since there's no specific "uncore" voltage now (don't mistake CPU core voltage with the uncore that contains L3 cache, the memory controller and now PCI-Express controller), it does limit the extra voltage that can be applied to the memory and 1.65V is still the norm for most performance modules. We have run 1.8V for short periods of benchmarking to push our memory further, which the CPUs will handle fine, but we don't recommend long term use over the recommended settings."
(source http://www.bit-tech.net/hardware)

so iam a bit confused when you say RAM voltage 1,8 v, label on ram says 1,5-1,6v.

thanks again for help
ttom

[GSKILL TECH]

Sorry about that, try increasing memory voltage to 1.7V and see if that will provide better support. IMC 1.40V may be required for 8GB as well.

THank you
GSKILL SUPPORT

[ttom]

Hallo,

tryed this settings for voltage RAM 1,7V and IMC 1,4V but the same problem, 8gb not stable black screen/bsod after 1-5 min, even in the memory/cache benchmark in everest.
XMP profil used (trfc was manual on 88)

thanks for help
Ttom

[Tradesman]

Have you tried command rate 2T?

[ttom]

Hallo Tradesman,
thx again

i tested 2T and 3T on commandrate, no sucess so far.


Ttom

[GSKILL TECH]

Try the following settings:

AI Overclock Tuner - Manual
CPU Ratio Setting - 21.0
BCLK Frequency - 133
DRAM Frequency - DDR3-1596MHz

DRAM Voltage - 1.65V

DRAM Timing Control (submenu)
CAS Latency - 9
RAS to CAS Delay - 9
RAS PRE Time - 9
RAS ACT Time - 27

DRAM Timing Mode - 2N
All others can be AUTO

Leave the rest to AUTO. Let me know how that goes.

Thank you
GSKILL SUPPORT

[ttom]

Hallo,
tested your settings for cpu and freq.

after 15 min spontaneous pc reboot....


voltage :
ram 1,65v
imc 1,2 v

mem settings

Speicher Timings:
CAS Latency (CL) 9T
RAS To CAS Delay (tRCD) 9T
RAS Precharge (tRP) 9T
RAS Active Time (tRAS) 27T
Row Refresh Cycle Time (tRFC) 87T
Command Rate (CR) 2T
RAS To RAS Delay (tRRD) 5T
Read To Read Delay (tRTR) Same Rank: 4T, Different Rank: 6T, Different DIMM: 7T
Read To Write Delay (tRTW) Same Rank: 10T, Different Rank: 10T, Different DIMM: 10T
Write To Read Delay (tWTR) Same Rank: 17T, Different Rank: 5T, Different DIMM: 5T
Write To Write Delay (tWTW) Same Rank: 4T, Different Rank: 7T, Different DIMM: 7T
Read To Precharge Delay (tRTP) 8T
Write To Precharge Delay (tWTP) 23T
Four Activate Window Delay (tFAW) 24T
CKE Min. Pulse Width (tCKE) 4T
Refresh Period (tREF) 740T
Round Trip Latency (tRTL) 45T

[ttom]

Hallo,

even with the newest bios 915 no success.

further help?, or its impossible: 8gb gskill mem on asus?

Ttom

[gpb500]

I'm running the DDR3-2000 RAM on the Asus P7P55D Deluxe board. I found this weekend that this RAM is not stable at 1.65v (8GB). If you haven't tried dialing it down a bit, well, you might find a positive result like I did. I was good at 1.6v (1.625v was failing after 30 mins in Prime95, 1.65v was failing in less than a minute...MEMTEST was actually OK for one pass at which point I got bored). FWIW...good luck.

[ttom]

gskill dont like asus

Hi,
thx for help gpb500

tested with dimm v 1,5, 1,55, 1,6 and 1,65 and 1,7 v
imc v from 1,1 v - 1,3 v

no sucess!

GSKILL dont like asus, with 8gb.

[gpb500]

Just for the hell of it, why not try setting your tRFC to something higher like 110 to eliminate that variable too. Only reason I mention it is that it was a solution for someone on a different forum...with Asus. If it fixes it, you can then try to back it down to where you're good. I'm not a tech, I just play one online.

BTW, IMC and PLL didn't do anything for me either and on other forums, most were holding their IMC at 1.21 which I think is near or at spec. I'm running my RAM at 1960 now as I couldn't get it stable above 2000. That's how I got 8GB to work...plus one RMA. Oh, one other thing to check is Round Trip Latency as it CHANGES between boots...at least on mine. Sometimes 51/52, other times 51/53.

[G.SKILL]

in fact, we do not guarantee 4 dimms in dual channel on all motherboards
we only guarantee 2 dimms in dual channel would reach our rated spec

and please try to update the BIOS to the latest version, it may help
thanks


G.S