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OCing help

B

blackllotus

Golden Member
Well my new system basically includes an Athlon 3800+ X2 and an Asus A8N-E motherboard. Its auto-overclock feature (max of 10% which gives me 2.2 ghz) is great and my system runs smoothly, but I've heard of people reaching 2.35-2.4 ghz and now I'm greedy. However I am a big overclocking newbie and can only understand half of what is said in the guides.

The following are the options I can modify
Hyper Transport Frequency
CPU Frequency
PCI Express Clock
DDR Voltage
CPU Multiplier
CPU Voltage

I tried setting CPU Frequency to 230.00 (up from 220.00), but Windows wouldn't boot (I left everything else on auto). I also tried lower HT Frequency to 3x, setting voltage to 1.3375 and CPU Frequency to 230.00, but that didn't help. I guessed I should set CPU Multiplier to 10x, but wasn't sure so I left it on auto. I read zebo's guide but the terminology didn't match the settings in the bios, and I had a hard time trying to "convert" them (like whats the HTT? I assumed it was the CPU Frequency). I don't want to wreck my comp, so I haven't fooled around too much. I know I sound like a total noob, but I would really appreciate any advice for overclocking (maybe up to 2.3 from 2.2?).
 
hypertransport frequency should be at 3x
cpu voltage default is 1.35-1.4 roughly, try 1.4-1.45 volts
leave cpu multipler at 10x
pci express clock should be 100 for nvidia cards or 105 for ati cards
ddr voltage depends on what you have set, if its at 2.5 or 2.6, you should be able to do 2.6 or 2.7 safely (though it might not do anything)

the problem is your memory is right now running at 220 i'm guessing (from the 2.2ghz overclock), when you overclock to 2.3ghz (the memory is running at 230), you need to find a memory divider and set it to 5:6 or 4:5
 
Ah... the memory divider helped a lot! Thanks.

Now my system appears to be running stable at 2.4ghz (1.375 CPU voltage). I say appears because it can successfully do SuperPI and CrystalMark, however I haven't had time to do Prime95 for more than 5 minutes. I can probably get a couple hours in tonight. Basically what I did was set a memory divider of 5:6 and CPU Frequency of 240. It appeared to run stable however it pooped out at a couple points (I was running at a CPU voltage of 1.360, which is possible since CPU voltage was on auto). I then took the CPU voltage off of auto, and set it to 1.375 and haven't seen any problems since. More on the prime tests tonight.
 
Definitely Prime it up ... Windows by itself isn't too demanding and it might "appear" fine when it really dies under load...

That said there are a lot of 3800+ hitting 2.4 so you may well be right. If Prime starts to fail you may want to give it (a bit) more juice. Just make sure you can keep it cool (I don't recommend anything over 60C under full load).
 
run small fft's but since this is a dual core, you need to have 2 running (one for each core), open taskmanager and make sure both cores are at 100%

if 32M superpi is stable and prime fails after the first 5 minutes, it usually means the cpu need a little more voltage, you just have to figure out how much
 
Well Asus Probe 2 says that the processor is idling around 29-30C and the maximum I've seen it reach on a high load is ~45C. Are these good temps?
 
Lol stock cooling. Asus Probe 2 only displays data for one CPU, so I wonder if it is averaging the two temps tor something. Are there any freeware temperature readers?

EDIT: However that doesn't make sense since there is only one processor, so I doubt it would need a dedicated temperature sensor for each core.
 
Whenever I open up a second instance of Prime95 it just closes down immediately (first one stays open). There is probably just some setting I have to change, but I can't find it. Any suggestions?
 
bump. No help? The only way I can currently stress my system is by running Prime95 on one core and 32M SuperPI on the other. I can't get two instances of prime to open...
 
Quote from the overclocking guide further up

UPDATE: Dual core CPU stability testing
X2 is not any different than a single processor overclocking but for volts and when prime testing CPU(s) for stability:

Volts should not exceed 1.45 for safe operation!

Prime95
1. Make two folders with Prime95
http://mersenne.org/gimps/p95v2413.zip

2. Starting two instances: Launch both instances from each folder and choose: torture test > small FFT's > click OK.

3. Next, launch taskmanager and set affinity of the first instance of prime to CPU 0 only. The other instance of prime to CPU 1 only.
 
Running two Prime95's now, CPU usage = 100%

CPU temps are running ~52C is this safe? Or a can this burn the processor? (like is there even a chance that the processor can burn out? AMD says max temps the proc can support is 71C)
Mobo temps are ~31C, same questions as for CPU.
 
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