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Help OC'ing Athlon 64 3500+ Venice - Page 2

post #11 of 19
Thread Starter 
Okay so I managed my first overclock! I feel warm inside (like my newly oc'd cpu probably is). So here is a screenshot of the new CPU-Z information. The one thing that i'm not sure i've done right is to do with the memory. I can see the memory is now running at 210MHz (same as the FSB/HT). Should I low the memory speed using the K8 CPU Clock Ratio so that it is running below its default speed? Thanks for your help




Oh yeah, I noticed my HT Link frequency has also gone up, is this okay? Temps seem to be identical to before I overclockd and system hasn't crashed yet so I feel good. How high can I safely raise the FSB before the RAM starts to complain? Do I need to change the ratio? I appreciate your help 8)
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post #12 of 19
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Okay I've managed to overclock to 220Mhz now but I've tried running Prime95 and the test fails after about 5-25 minutes (depending on the test). Temps are maxing about 36 degrees C at most while I run the torture test. Could this be a voltage problem? The RAM is underclocked to 166 MHz (from the default 200) and the HT frequency is set to 4 from 5.
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post #13 of 19
Quote:
Originally Posted by b0ng0 View Post
Okay I've managed to overclock to 220Mhz now but I've tried running Prime95 and the test fails after about 5-25 minutes (depending on the test). Temps are maxing about 36 degrees C at most while I run the torture test. Could this be a voltage problem? The RAM is underclocked to 166 MHz (from the default 200) and the HT frequency is set to 4 from 5.
You need to increase VCore (CPU voltage). Do so slowly; increase VCore to the next increment, and test the OC again with Prime95. You likely will go further along in the stress test.

A suggested method: Increase VCore to the next increment; test with Prime95; if test runs for a minimum of 30mins, increase HTT Clock ("FSB") by 5MHz; test with Prime95 again, for a minimum of 30mins; if P95 test fails within 30mins, increase VCore again to the next increment.

Wash, rinse, repeat.
    
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post #14 of 19
Thread Starter 
Awesome, thanks for the help. Just to check, how much should I safely be able to raise the VCore to before my computer turns into a pile of liquid metal?
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post #15 of 19
Quote:
Originally Posted by b0ng0 View Post
Awesome, thanks for the help. Just to check, how much should I safely be able to raise the VCore to before my computer turns into a pile of liquid metal?
Hmm... much, much more than what your PSU and motherboard can send into your CPU.

In all seriousness, though, you don't really need to worry about the voltage you send into the chip too much simply because, if you go methodically with your adjustments, you'll pretty much figure out that there's a point wherein the CPU simply won't scale higher and pass the stress test no matter how much you increase VCore. In a mad fit of testing a few months back, I sent 1.7V VCore into a S939 CPU trying to get it to run stable at 3.1GHz. It didn't work, even at that super-high VCore.

For the sake of giving you a nominal figure, though, I'd say no more than 1.55V VCore if you have air cooling.
    
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post #16 of 19
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Okay so I have managed to overclock the CPU to 2.6 GHz (237 MHz FSB, running stable) but to do this I've had to raise the voltage. On CPU-Z it says its at 1.6V and on my motherboard software (EasyTune5) it says it's at 1.67V. I don't really want to push the voltage any higher as I read that 1.6V is really the maximum you should have a Venice core at to give it a reasonable life. Does this overclock seem reasonable for the voltages, or could something be holding it back? My temps are maxing out at 46 degrees C under load.

Also, I wouldn't mind overclocking the RAM a bit but I have even less of an idea about how to do this. Again, thanks for your help



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post #17 of 19
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I have started trying to overclock the memory by starting with trying to change the timings. I think it's best not too change them too much but at the moment I have them set to 2.5-3-3-6 and they seem to be stable. However for some reason, I have to have the memory set to 166 MHz to be able to change the tRAS to 6. If I have it at the default 200 MHz I can only have the tRAS at 8 for some reason...
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post #18 of 19
:\\ Venice and overclocking...I didn't get all that far either. Mine went 2.4 --> 2.7.

You have much better ram than I do, so you may get more...what's your multi sitting at?
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post #19 of 19
Thread Starter 
Multiplier is just the default one, x11 (I assume you mean the CPU multiplier). HT is sitting around 900 MHz. With the RAM underclocked to 166MHz base, it's running at only 176 MHz (at my current overclocked CPU level) but I'd like to get it up higher. Maybe I can just have the FSBRAM at a 1:1 ratio...
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