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The 8-core Zambezis

post #1 of 11
Thread Starter 
I have a question regarding the 8 cores. One is specced as being 95W TDP while the other is specced as 125W TDP. Does this mean that the 125W version will be having more overclocking headroom since it can handle the heat? But isn't it always the low TDP CPUs that can overclock better since they do not produce alot of heat?
So TLDR version:
8-core 95: less heat, more overclockability.
8-core 125: more heat, less overclockability

OR
8-core 95: less heat, less overclockability
8-core 125: more heat, more overclockability

Also, I remember the difference between the 955 C2 and C3 was that the TDP in the C3 was lower than the C2 and hence the C3s overclocked better.
I am seriously wondering what the difference between the 2 octacores is. And how their overclocking potential would be like. Can someone throw some light on how TDP relates to overclockability?
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post #2 of 11
The 125w one is clocked higher at stock so it has a higher TDP. The less the TDP, the less heat your chip will produce and will overclock better.
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post #3 of 11
I think the 125w doesn't actually consume 125w. More like, it just barely crossed over the 95w border due to its higher frequency.
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post #4 of 11
More than likely, neither of them will come anywhere close to 95w

95 is the ABSOLUTE max, ex, it should never under any circumstances go over it.


Since they are the same silicon, they will probably perform about the same overclocking wise.
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by reflex99 View Post
More than likely, neither of them will come anywhere close to 95w

95 is the ABSOLUTE max, ex, it should never under any circumstances go over it.


Since they are the same silicon, they will probably perform about the same overclocking wise.
I just found out that the TDP is not the wattage that your CPU is currently at. It is just a spec number. Say, if you overclock your CPU which is specced at 125W TDP, your CPU maybe using 150-160W of power.
My guess is both octacores would have similiar overclockability, but the 125W octacore would use significantly more power than the 95W one at max overclocked speed.
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post #6 of 11
The higher rated at stock frequency will overclock better.
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post #7 of 11
Don't any of you people do any research? Read AMD's blog, it tells you all you need to know about BD's TDP.

The TDP of the two 8 cores is to do with Turbocore 2, which will overclock better remains to be seen, but that's not why AMD gave them different TDP's, AMD couldn't care less about your overclocking headroom, all that matters is stock performance.
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post #8 of 11
Thread Starter 
Quote:
Originally Posted by purpleannex View Post
Don't any of you people do any research? Read AMD's blog, it tells you all you need to know about BD's TDP.

The TDP of the two 8 cores is to do with Turbocore 2, which will overclock better remains to be seen, but that's not why AMD gave them different TDP's, AMD couldn't care less about your overclocking headroom, all that matters is stock performance.
Both 8 cores would use Turbocore 2 and the difference in both the stock frequencies would probably be 200Mhz, so then why the need for such a high difference in their TDPs.
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post #9 of 11
Quote:
Originally Posted by CptSpock View Post
Both 8 cores would use Turbocore 2 and the difference in both the stock frequencies would probably be 200Mhz, so then why the need for such a high difference in their TDPs.
Maybe it's meant that way so that when the Turbo Core 2 is boosting, it just boosts the cores until it hits the 125w mark? With the 95w one it would boost until it hit the 95w mark.
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post #10 of 11
The TDP is a safety margin to be observed when speccing mobo's because when you overclock a cpu you increase the voltage and current,consequently the TDP is overshot:
so for instance my 96w TDP sees 150w when being fed 1.5v.

I would go for the higher TDP model on a later stepping personally as long as my cooling is up to the job,
The thermal parameters become an irrelevance and previous AMD models have shown the earlier steppings to be a higher TDP but not necesarily a better overclocker,
less heat waste=less stressed components=higher clocks.
I don't think they throttle when hitting the TDP,but the preset heat barrier.
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