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  #1  
Old 09-03-2010, 02:47 AM
mabasic mabasic is offline
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Default F2-8500CL5-2GBPI-B at 1066MHz + Asus M4A78-E

Model of the motherboard: Asus M4A78-E
Model of the memory: G.Skill F2-8500CL5-2GBPI-B
Model of the CPU: AMD Phenom XII 550 BE

After some time my PC crashes when running this memory at 1066MHz.
At 800MHz it is stable.

The timings i have set are:

CAS Latency (CL) 5.0
RAS# to CAS# Delay (tRCD) 5
RAS# Precharge (tRP) 5
Cycle time (tRAS) 15
Bank Cycle times (tRC) 41
Command rate (CR) 2T
Voltage (V) 2.100

I know that reccommended setting for tRC is 48 but my MB can't set tRC higher then 41, is there an alternative ?
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  #2  
Old 09-03-2010, 10:56 AM
wevsspot wevsspot is offline
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Enter BIOS and go to the AI Tweaker Menu


Scroll down to CPU/NB Voltage and add +.025v
Scroll down to DRAM Voltage and set it at 2.06V
Scroll down to NB Voltage and set it at 1.40v

Press F10 to save changes and exit BIOS.

Test memory for eight hours using Memtest 86+ version 4.10

If none of this works because of the tRC limitation of your BIOS you may need to use a third party tool like Memset to change the tRC in the Windows environment.
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  #3  
Old 09-03-2010, 02:22 PM
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GSKILL TECH GSKILL TECH is offline
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NB Voltage should be fine on AUTO. Although increasing HT Voltage (if available) may help.

For DDR2-800 to 900, you can use 4-4-4-12 timings and it would be just as quick as DDR2-1066 CL5.

Thank you
GSKILL TECH
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  #4  
Old 09-03-2010, 04:21 PM
wevsspot wevsspot is offline
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It's available
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  #5  
Old 09-04-2010, 06:03 AM
mabasic mabasic is offline
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Default i think i solved it

Thank you for your suggestions, if this current setup fails i will try yours suggestions.

This is how i solved it:

0. (very important) re flash your BIOS
1. (also very important) disable UMA+SIDEPORT.
2. Set Frequency to 1066mhZ
2. Timings: 2T 5-5-5-15 (tRC = 32 (that's the default value; just leave it default))
3. DDRAM Voltage = 2.10 V

I have tested it with prime95 and AOD.
For some reason re flashing the bios solved the error during the tests.
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Old 09-07-2010, 08:01 AM
wevsspot wevsspot is offline
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mabasic,

i wanted to reinforce a very important part of your problem solving - flashing to the latest BIOS revision level.

this should be a first step when upgrading hardware. technology is changing so fast that the latest and greatest hardware support has to constantly be coded into the latest BIOS releases.

so for anyone having stability or compatibility problems, one of the first things I recommend is checking your current BIOS revision and updating it if there is a newer one available from your motherboard mfg.
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  #7  
Old 09-11-2010, 04:19 PM
mabasic mabasic is offline
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Quote:
Originally Posted by GSKILL TECH View Post
NB Voltage should be fine on AUTO. Although increasing HT Voltage (if available) may help.

For DDR2-800 to 900, you can use 4-4-4-12 timings and it would be just as quick as DDR2-1066 CL5.

Thank you
GSKILL TECH
Well, I finally had some time to field test system stability and the good thing is that windows runs great, no problems. Only memory demanding apps crash sometimes. And when one app crashes prime95 reports hardware failure from then on until I restart my PC.

Now I'm running my memory at 800Mhz with 4-4-4-12 as you suggested. I have left the voltage at 1.8V and it's stable.
Should I increase it to 1.9V ? I have read that with those timings goes 1.9V.
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  #8  
Old 09-13-2010, 08:02 AM
wevsspot wevsspot is offline
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Try DRAM voltage at 1.86v first and see if that is stable. If not go ahead and bump it up to 1.9v
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  #9  
Old 09-13-2010, 09:50 AM
mabasic mabasic is offline
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Quote:
Originally Posted by wevsspot View Post
Try DRAM voltage at 1.86v first and see if that is stable. If not go ahead and bump it up to 1.9v
I have tried it at 1.86V as you suggested, but after some time windows crashed so i set the voltage to 1.9V and now it's stable.
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  #10  
Old 09-13-2010, 11:50 AM
wevsspot wevsspot is offline
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Great news! Congratulations.
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