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Memory setting question on overclocking x2 4000+

post #1 of 7
Thread Starter 
Hi all,

I am now on 10.5x222 = 2.33 GHz and I tried to overclock to around 2.6 GHz. Since I don't want to overclock the memory, I tried to set DDR2-533 in the BIOS, HTT 4x, FSB 254, multiplier @ default 10.5 giving a speed of 2.67 GHz (memory @ 333.3MHz) but cannot POST (long beep sounds and black screen).

If I change the memory speed to DDR2-667 it can POST and stable in Windows or 3D games, but the memory will be running at 381MHz and thus being overclocked. Any idea/suggestions?

Thanks!!
    
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post #2 of 7
I have heard about this same type of problem before where some of the dividers don't seem to work. Couple of suggestions:
1. Don't worry right now about your CPU speed and drop the CPU multi to 10x. Does that allow you to boot using the other dividers?
2. Are you running the latest bios?

What is your max FSB?
Why are you so worried about overclocking your memory. If it is stable at 381 with stock volts you are not going to damage anything and it is a free performace boost. By the way....operable phrase is "Stable".
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post #3 of 7
Leave the memory at 667 but loosen the timings a bit. I have the same kingston 667 but mine are 2 x 1Gb. They will O.C. a little. Loosen timings and give the ram a little voltage if you can. Run orthos to test if its stable. You can find it online for free.
post #4 of 7
Thread Starter 
Thanks for "Lancer33" and "PR1M3R" for the replies.

I have tried to lower the multiplier to 10, 9.5 or even 9, I found that I can use DDR2-533 setting to POST at FSB 250 at maximum, I tried FSB 254 it can post but system hangs up very quickly. Any multiplier with FSB greater than 254 will not POST. I also tried other divider with DDR2-400 but same. I also tried lowering the timings and adding voltage but same. I am using the latest BIOS (Rev. 0802).

Actually I am not worried about overclocking the memory, and I will finally overclock it for sure, but in the progress of finding a higher stable cpu speed, I would like to keep other factors at stock rate (to eliminate other reasons causing system unstable).

I also heard from others that Kingston 1GB DDR2-667 can be overclocked to DDR2-800 at 2.0V. Maybe I will try in another way - keep cpu speed at stock, find out the highest stable memory speed and then overclock the cpu.

Thanks!!
    
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post #5 of 7
http://www.overclock.net/amd-general...ing-guide.html

Give that a quik read. It may help you find out what your actual max speeds are for Mem, CPU, HTT and FSB.

For example: my max FSB is 265 but my CPU stops at 3100 Ghz or 239x13. My best performance comes from 258x12 because I get higher memory bandwidth. Once you have found the max for everything then you can try different combinations within those parameters to get the best performance possible.

Read the guide at the link above.
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post #6 of 7
Most A64's do not like .5 multi's. That is usually what affects performance most.
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post #7 of 7
Quote:
Originally Posted by Mr Bear View Post
Most A64's do not like .5 multi's. That is usually what affects performance most.

Thats a BRisbane CPU and the default multi is 10.5

Leave it at the 10.5 and drop the trfc down when you hit a wall...

that cpu will scale to 2.8ghz on stock volts and may hit 3.0ghz on the same...but it is all ram dependant...

Use memtest to find the rams limits at the stock speed (667) Loosening the main timings may not help as much as lowering trfc and max-async or async latency...

what you do when Memtest passes is finish fine tuning the ram with Orthos...

Use Memtest version 1.70 or newer...

I have had mine pass at 270fsb but crap Orthos in 5 seconds...playing with trfc has allowed me to go higher on less volts..

in the beginning it too 1.4v to hit 270...but now I am at 270 with 1.25v big difference.. plus it stable..

When you think your CPU wont budge...play with the ram and you'll be amazed at what it will do...these clock better than 939's but need more ram fiddling to get them there...
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