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DDR RAM OC issue

post #1 of 18
Thread Starter 
At 220x10 with 1:1 divider I can get 220mhz easily.

But when I try 265x10, and a 5/6 divider (166mhz) which is equivalent of 220mhz on the RAM, I can't even get it to POST.

I'm sure it isn't the CPU OC as when I lower the divider to 2/3 (133mhz) it boots and stress-tests fine.

I'm running the RAM at 2.65 generally and I tested it with 2.75v too.
Timings : 3-3-3-8 2T

Any ideas?
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post #2 of 18
It could be an issue with the bios I suppose, I have a very similar problem when I use the 180 divider at anything over 243fsb, simply won't take it even though i know both the ram and the cpu can take those frequencies.

Someone else may actually have a soution though, but you aren't alone.
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post #3 of 18
Thread Starter 
Quote:
Originally Posted by Mr. Jules View Post
It could be an issue with the bios I suppose, I have a very similar problem when I use the 180 divider at anything over 243fsb, simply won't take it even though i know both the ram and the cpu can take those frequencies.

Someone else may actually have a soution though, but you aren't alone.
Hmmm, thanks for the reply. But I need to know this for a fact. I don't even know how to google this issue!

Anyone else got any ideas or insight on this issue.
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Intel i7 920 Asus P6T Gigabyte 4870 1 GB Kingston 3 x 2 GB 
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Intel i7 920 Asus P6T Gigabyte 4870 1 GB Kingston 3 x 2 GB 
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post #4 of 18
Yeap , that is the old divider problem with the Asus A8N series ,,, sometime for unknown reasons when you use a divider on the memory you cant overclock it , i have had the same problem with my A8N-E however others were running trouble free with the same identical components , so bottom line : it is an issue with the Mobo , how to fix it ? try different Bios ,, maybe you are more lucky than me
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post #5 of 18
not sure about those mobos, but in general, try looser timings maybe?
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My Baby :)
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post #6 of 18
Thread Starter 
Quote:
Originally Posted by kemo6600 View Post
Yeap , that is the old divider problem with the Asus A8N series ,,, sometime for unknown reasons when you use a divider on the memory you cant overclock it , i have had the same problem with my A8N-E however others were running trouble free with the same identical components , so bottom line : it is an issue with the Mobo , how to fix it ? try different Bios ,, maybe you are more lucky than me
Did downgrading/upgrading your bios actually work?
Current Rig
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CPUMotherboardGraphicsRAM
Intel i7 920 Asus P6T Gigabyte 4870 1 GB Kingston 3 x 2 GB 
Hard DriveOptical DriveOSPower
WD 750GB LG DVD Drive Windows 7 x64 Corsair HX 520W 
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Current Rig
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CPUMotherboardGraphicsRAM
Intel i7 920 Asus P6T Gigabyte 4870 1 GB Kingston 3 x 2 GB 
Hard DriveOptical DriveOSPower
WD 750GB LG DVD Drive Windows 7 x64 Corsair HX 520W 
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post #7 of 18
For me it didn't ,, i ran @ tight timings 2.5-3-3-8 1T to compensate the lost bandwidth
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E8400 @4.2GHZ GA-EP31-DS3L HD4850 512MB + Zalman 2X2GB Kingston @PC8000 
Hard DriveOSMonitorPower
250GB WD XP SP3 + Vista home perimum 19' BenQ Widescreen HEC 580W 
Case
Gigabyte setto 1000 
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My System 2
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E8400 @4.2GHZ GA-EP31-DS3L HD4850 512MB + Zalman 2X2GB Kingston @PC8000 
Hard DriveOSMonitorPower
250GB WD XP SP3 + Vista home perimum 19' BenQ Widescreen HEC 580W 
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Gigabyte setto 1000 
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post #8 of 18
Don't know about the motherboard but what about your north bridge voltage? That might be needing some more, and I don't know about everyone else, but I'm running my cheapo ram at 3.24 volts 24/7 , so you could notch it up slightly (mines propabably too high though ) .

Lower you HT link also. No brainer, but some times people forget, and good luck .
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post #9 of 18
For the sake of embarsement, I'll mention it again...
Why and how I do not know why with some Asus 939 MBs, but for some they claim it works others, not!
If you have no floppy drive, enable it in the BIOS and set the Halt on Error to disregard it.
    
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post #10 of 18
Quote:
Originally Posted by The Duke View Post
For the sake of embarsement, I'll mention it again...
Why and how I do not know why with some Asus 939 MBs, but for some they claim it works others, not!
If you have no floppy drive, enable it in the BIOS and set the Halt on Error to disregard it.
This will only enable your Mobo to OC but wont hep with the memory issue , i ended up killing my Mobo
My System 2
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8400 @4.2GHZ GA-EP31-DS3L HD4850 512MB + Zalman 2X2GB Kingston @PC8000 
Hard DriveOSMonitorPower
250GB WD XP SP3 + Vista home perimum 19' BenQ Widescreen HEC 580W 
Case
Gigabyte setto 1000 
  hide details  
Reply
My System 2
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8400 @4.2GHZ GA-EP31-DS3L HD4850 512MB + Zalman 2X2GB Kingston @PC8000 
Hard DriveOSMonitorPower
250GB WD XP SP3 + Vista home perimum 19' BenQ Widescreen HEC 580W 
Case
Gigabyte setto 1000 
  hide details  
Reply
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