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AMD 7750/7850 B.E Club! - Page 46

post #451 of 587
Thread revival (oh noes!). I can hold a stable 3.2GHz clock, but Win7 despises 3.3GHz, no matter the volts. Any suggestions?

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post #452 of 587
3.2ghz is usually the wall for these chips some have gotten lucky and gotten further. so your good if can get that high stable.
Edited by Glyphor - 11/12/09 at 8:45pm
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post #453 of 587
Quote:
Originally Posted by Glyphor View Post
3.2ghz is usually the wall for these chips some have gotten lucky and gotten further. so your good if can get that high stable.
But I wouldn't be here on overclock.net if I didn't want to go overboard with my clock speeds.

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post #454 of 587
yes that is true, i've throw everything at this chip and the best i got was 3.276 so i am happy i got this far with it. others have tried and only reach 3.1. so you r ahead of the game so far.
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post #455 of 587
Since you don't have ACC Zeifer, you won't go much higher. If your temps are good though, 1.6v can be used 24/7 on the 65nm AMD chips. You may be able to push a few marks past the 200mhz HTT clock and up the CPU frequency that way.
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post #456 of 587
you can also try taking one stick out too. some have gone further with only 2gigs of ram.
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post #457 of 587
Quote:
Originally Posted by Dopamin3 View Post
Since you don't have ACC Zeifer, you won't go much higher. If your temps are good though, 1.6v can be used 24/7 on the 65nm AMD chips. You may be able to push a few marks past the 200mhz HTT clock and up the CPU frequency that way.
Hmm. The problem with that is this chip is very sensitive to voltage when it comes to temps.

Any truth to higher northbridge clock/voltages making CPU OCs more stable?

Quote:
Originally Posted by Glyphor View Post
you can also try taking one stick out too. some have gone further with only 2gigs of ram.
I don't think losing 2GB of RAM is worth the performance gain of 100MHz lol.
Edited by Zeifer - 11/13/09 at 4:32am
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post #458 of 587
Quote:
Originally Posted by Zeifer View Post
Hmm. The problem with that is this chip is very sensitive to voltage when it comes to temps.

Any truth to higher northbridge clock/voltages making CPU OCs more stable?

the memory controller is what causes the instability. Its not like Brisbane and integrated on the CPU itself.
    
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post #459 of 587
Quote:
Originally Posted by dlee7283 View Post
the memory controller is what causes the instability. Its not like Brisbane and integrated on the CPU itself.
And there's nothing I can do about that?
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post #460 of 587
Quote:
Originally Posted by Zeifer View Post
But I wouldn't be here on overclock.net if I didn't want to go overboard with my clock speeds.
Same here.

In my case I can get 3.2Ghz to load into Windows but isn't stable very long. no matter what I do. I can get 3.1Ghz to run Windows stable with higher voltages. However, if I push the CPU with a heavy game I have to drop down to 3.0 Ghz to maintain long-term game stability.

I just got a 550BE and tried with similar pattern. I can get it to load up to 3.98 Ghz but won't stablize with Windows. 3.9 will load but won't stablize with gaming. But 3.8 runs fine.

I don't know what I'm doing wrong with either chip that keeps me from stabilizing the extra 100 or 200 Mhz of either chip.

I tried a number of combinations of volts, underclocked RAM, HTlink settings. Even different BIOS versions.

So.. yeah, you should be able to bet the 7750 to boot bios and into windows at 3.2 Ghz. But stability above 3.0 Ghrz seems to be the challenge. Reaching above 3.2 with the 7750 is really pushing the envelope.
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