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Phenom II 955 BE - almost stable at 4.2 GHz? - Page 2

post #11 of 54
Thread Starter 
Quote:
Originally Posted by SIMPSONATOR;12881938 
That it would. He must have meant 16.5

Actually, the mistake was on the FSB setting. It's actually 225 (running @ 4162.5 MHz).
Sorry about that! I'll update my post.
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post #12 of 54
Well, if it truly is 18.5*255, that would be a tough one to pull off, haha. I've gotten my 955 stable at 250*16.5. The reason I asked about the RAM is that when my RAM was at 1500 instead of 1333, it would cause problems even in situations when I was stressing the CPU and not the RAM. Just throwing that out there. Also, 1.56v would be a bit higher than you might need for 4.2, I think. I've done it around 1.44v, but every chip is different.

edit: Ah, 225 makes more sense.
Edited by falconkaji - 3/26/11 at 4:44pm
    
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post #13 of 54
Thread Starter 
Quote:
Originally Posted by Maelthras View Post
I would clock it down to 4.1 and call it good, that's a very nice overclock for a 955. My own 955 can't get near 4ghz and stay stable. So to be pushing 4.1 is pretty impressive.
Well, thanks! I'd normally settle with 4.1 but as the system seems pretty stable (no crashing, no freezing) I'm targeting 4.2 GHz. But then again, failing a +2 hour Prime95 test is really that bad?
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post #14 of 54
Is your HT link still at stock speed, or did you let it go up as you increased the reference clock? That thing gave me all sorts of trouble when I was overclocking my 955.
    
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post #15 of 54
Thread Starter 
Quote:
Originally Posted by falconkaji View Post
If you have any way to get your CPU under 50c, I bet you could pull it off. In my experience, my 955 gets grumpy the higher it goes over 50c. Of course, 4Ghz is nothing to complain about either.
Yeah, if I lower my VCore I can get under 50º, but Phenom II 955 BE safe max temp is 62º so I'm not too worried about temperature so far. Besides, with lower VCore I would not even pass a 10 min Prime95 test (still no crashing, though).
And I agree, 4 GHz is a pretty nice OC. However, who doesn't want more?
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post #16 of 54
Thread Starter 
Quote:
Originally Posted by falconkaji View Post
Well, if it truly is 18.5*255, that would be a tough one to pull off, haha. I've gotten my 955 stable at 250*16.5. The reason I asked about the RAM is that when my RAM was at 1500 instead of 1333, it would cause problems even in situations when I was stressing the CPU and not the RAM. Just throwing that out there. Also, 1.56v would be a bit higher than you might need for 4.2, I think. I've done it around 1.44v, but every chip is different.

edit: Ah, 225 makes more sense.
I tried using RAM stock speeds and still couldn't get pass tests. That's why I increased the RAM frequency.
In any case, I agree 1.56v is a lot of voltage, but I've been overvolting in order to get to a stable point. I started off at 1.47v and been upping it ever since.
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post #17 of 54
Thread Starter 
Quote:
Originally Posted by falconkaji View Post
Is your HT link still at stock speed, or did you let it go up as you increased the reference clock? That thing gave me all sorts of trouble when I was overclocking my 955.
Stock speed. Last time I messed with the HT link I screwed up the whole thing and had to start over. What value do you suggest?
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post #18 of 54
where is the cpu-nb at clock at? 4.0ghz with cpu-nb 2800 beats and overclock of 4.2ghz with cpu-nb at 2.0ghz by a far margin.
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post #19 of 54
Well I've read that there is no point going over 2000MHz, but I haven't noticed any improvement whatsoever in taking it above the stock speed, so I figure it isn't worth messing with. In regards to the max safe temp, you're definitely fine at your current temperature, but I've noticed that I get more stability around 50c than when I let it start heading towards 60c.

If you can't get it stable with that much voltage, it might be time to settle for the best you can get. I run my 955 at 4GHz, 1.44v - it runs relatively cool, and seems happy. Of course I understand wanting to push higher, which is why I had mine at 4.25 for a while. Just feels nice to say you did it, haha.
    
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post #20 of 54
Quote:
Originally Posted by sleepergsr View Post
where is the cpu-nb at clock at? 4.0ghz with cpu-nb 2800 beats and overclock of 4.2ghz with cpu-nb at 2.0ghz by a far margin.
I think he said in the OP that it is at 2700.

Someone made an interesting thread about the effect of the NB on actual performance, I'll try to find the link.
    
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CPUMotherboardGraphicsOS
Phenom II X4 955 BE @ 4GHz ASUS M4A89GTD Gigabyte 6850 + XFX 8800GT Debian/Win 7 
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Antec EarthWatts 650 NZXT Phantom 
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