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Need some advice overclocking a E6400 - Page 3

post #21 of 27
Thread Starter 
Quote:
Originally Posted by briank View Post
Ok, the ASUS P5x BIOS is a little confusing. RAM and CPU frequency settings are not completely independent like you may be thinking. Both are linked to the setting under JumerFree Configuration called "CPU Frequency". When you change this setting, you are changing the base FSB frequency. Because the CPU FSB is quad data rate, its effective frequency is 4X the base FSB. Stock FSB is 266. 4X266 = 1066MHz which is what you are seeing stock.

Frequency of the RAM is determined by two things. The base FSB and the FSBRAM ratio. This ratio is set by the DRAM Frequency setting (even though it doesn't mention ratio in the name). The ASUS BIOS names the choices for DRAM Frequency stuff like DDR-533, DDR-800, etc. The DDR-533 setting is the 1:1 ratio. This is because 266x2 = 533 (RAM is double data rate). As you increase the CPU Frequency setting, the names of the DRAM settings will change accordingly. The 1:1 ratio will always be that 1st setting under Auto.

So basically do this under the Advanced menu in your bios.
1) Turn AI Tuning to Manual
2) Set DRAM Freq to DDR-533
3) Increase CPU Freq (by pressing the + key) to something higher than 266. I suggested 333MHz before since your ram is rated for that.
4) Save your settings. System will reboot and check to see that it overclocked.

If it crashes, you may have to increase Vcore or Memory voltage. If you have no clue to set these to, start with Vcore = 1.325V and Vmem = 2.0V. These may be higher than you need for that frequency, but they are certainly still safe voltages.

About the core codenames: E6300's and 6400's are Allendales. E6600's and above with the 4MB cache are Conroes.
Well like I was saying there is no setting for DDR just the frequency. I guess the BIOS automatically detects this when you put them in the Dual dimm slots. I have set it to manual, and I cant change the multiplier only the fsb and it shows up only as 1066 on cpu and 533 on ram. I can change those as is so it doesnt really show up as half the value or even a 4th of the value but I see where you are coming from. So far I can set it to 533/1066 and it boots and runs fine with that 1:1 ratio. even with voltage set at 2.5V. The ram will run at 667 which is what it is stock but it takes the timings to something like 5-5-5-3 instead of the 4-4-4-2 I get at 533.

So what youre saying is the ram mhz needs to meet or exceed the cpu base fsb? SO I will set the ram to 667, the voltage at 1.35V and the mem volt to 2.0 then increase the cpu mhz by 10 and see what happens. brb
    
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post #22 of 27
Thread Starter 
OK I set the cpu voltage to 1.35 and the mem volt to 2.0. Increase in 10mhz increments from 1066 to 1130 but at 1150 it hung up at boot and wouldnt go further. CPU-z was showing:




Any thoughts as to why it hangs at 1150 and up?
    
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post #23 of 27
OK, I looked at the manual for your motherboard which explains quite clearly how to overclock your MB:

1) Go to the JumperFree Configuration menu
2) Set 'AI Tuning' to [Manual]
3) Go to the Frequency Control submenu
4) Keep PCIE frequency at 100
5) Set 'System clock mode' to [CPU Precision Tweaker] - This allows you to adjust CPU and mem frequency linked together
6) Edit 'New FSB Speed' with [1332] - this is (333MHz X 4)
7) Leave memory settings on Auto

That should get you going on an overclock. Read the manual if you want to start experimenting with CPU:memory ratios different than 1:1. You have to alter the 'system clock mode'
     
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post #24 of 27
OK, sorry. We were typing at the same time I guess.

Try going to the Advanced -> Chipset -> Memory Timings menu
Set everything back to [Auto]
4-4-4-2 is a weird timing. I run 4-4-4-12 and 5-5-5-18 is common.
     
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post #25 of 27
Thread Starter 
Quote:
Originally Posted by briank View Post
OK, I looked at the manual for your motherboard which explains quite clearly how to overclock your MB:

1) Go to the JumperFree Configuration menu
2) Set 'AI Tuning' to [Manual]
3) Go to the Frequency Control submenu
4) Keep PCIE frequency at 100
5) Set 'System clock mode' to [CPU Precision Tweaker] - This allows you to adjust CPU and mem frequency linked together
6) Edit 'New FSB Speed' with [1332] - this is (333MHz X 4)
7) Leave memory settings on Auto

That should get you going on an overclock. Read the manual if you want to start experimenting with CPU:memory ratios different than 1:1. You have to alter the 'system clock mode'
I have read the manual and im not new to overclocking its just this one is a PITA. I am leaving the mem at auto which detects teh timings as you overclock. THe fsb settings in mem and cpu though are not unlocked. Im oced to 2.26Ghz and its stable lol. I know its not much but atleast its oced dammit. LIke I told you before I cant get it to go past 1150 with mem set at 667.


Its lookin like 2.26Ghz is the best I can muster on this rig. Any clue as to why im limited here?
    
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post #26 of 27
Thread Starter 
bump
    
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post #27 of 27
madmax - how do you set the timings for the RAM?
RiG
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RiG
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