Changing Multiplier?

davemar14

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I have an Athlon XP 2400+ and an Asus A7N8X Deluxe Rev 1.04. I am buying a new cooler for the CPU, and I want to overclock the processor. I have heard that you can't change the multiplier without closing the L3 bridge. Is this correct? Or can I just change FSB and multiplier. I am only able to get it at 142*15=2130 mHz stable in 3DMark with the stock heatsink.
 

SidVicious

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First, what kind of memory are you using ?

You see, memory is a huge limiting factor when it comes to overclocking, PC2100 (Also Known As DDR266) is manufactured, tested and packaged to accomodate a 133MHz Front Side Bus, PC2700 (AKA DDR333) for a 166MHz FSB and PC3200 (DDR400) for a 200MHz FSB.

142MHz sounds like where PC2100 usually max out and start to go unstable, use <A HREF="http://www.cpuid.com/cpuz.php" target="_new">CPUz</A> to find out your memory default SPD (Serial Presence Detect) timings without having to open your computer case.

If your memory is at least PC 2700, try a different multiplier in your BIOS using the Manual settings, it may or may not be possible depending on your core stepping, <A HREF="http://www.cpuid.com/cpuz.php" target="_new">CPUz</A> will provide that information as well.

Try to stick to a conventionnal FSB like 166MHz and gradually up the multiplier until the CPU is'nt stable anymore.

<A HREF="http://www.mersenne.org/freesoft.htm" target="_new">Prime95</A> Torture Test is great for testing the CPU and memory for stability, as a rule of thumb, if <A HREF="http://www.mersenne.org/freesoft.htm" target="_new">Prime95</A> does'nt return errors within 24 hours, you can consider your CPU stable.

If you want to replace your stock HSF for something more OC friendly, look for an all copper HSF with a thick base and a lot of very thin fins, aluminium just is'nt enough.


Good luck !






Fok Speling Misstake
 

davemar14

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Well, I think the overclocking issue is heat. I am running 512 MB Corsair DDR 400 6-3-3-2. I have the memory in sync with FSB. This memory is wicked, I have been able to run this memory at those timings at 412 Mhz stable. CPU-Z reports the processor as Family 6, Model 8, Stepping 1. I am almost positive its a T-Bred B. Anybody know if the multiplier is locked? (Crashman!) I have an N-Force2, so it should be unlocked. Well, I am looking at the Thermaltake Silent Boost with Artic Silver. The heatsink is entirely copper with a lot of fins, and a 80mm fan on top. I have read good reviews about it. And artic silver...well that stuff is just awesome.

<A HREF="http://www26.brinkster.com/amdgamer1/main.html" target="_new">http://www26.brinkster.com/amdgamer1/main.html</A>
 

endyen

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Amd started locking the multipliers in the second half of last year. AFAIR the 2400+ tbreds were not done. You have the chip, so you tell us. Go into bios and see if you can change to manual, and then change the multiplier.
 

davemar14

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I bought my 2400+ in April 2003, so I should be able to change it. My problem is that the BIOS says it is a multiplier of 13, but its running at 15, cause 133*15=2000 mHz. Is there any way to fix it? Because if I change the multiplier, I have no idea what it is actually selecting. A BIOS update?
 

endyen

Splendid
So, for sure your multiplier is unlocked. It is a little strange to change, and been a while since I played on one of those boards (almost a week) but you go to advanced then down one and hit enter. You have to select manual to change multipliers.
As far as knowing what multiplier you get, confirm it with mbm5.
Try to find the 13X as the best results I got with an xp2400+ was at 13X with an fsb around 175 or so.