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Overclocking FX-8150 the right way - Page 2

post #11 of 35
Quote:
Originally Posted by Blameless View Post
Power draw really isn't that terrible, it's just that Sandy Bridge is crazy power efficient, especially when not pushing up against it's clock limit (watch SB power consumption jump 50% in that last 500MHz between 4.5 and 5GHz).

My Bloomfields and Gulftown don't draw much less than BD.
That's true, I'm just not used to being on chips that hog that much under load. The Phenom II X4 940 BE in my secondary comp doesn't, and my 2500K doesn't. Seeing new architecture consume that much in general is a buzzkill.
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post #12 of 35
NorthBridge speed scaling

http://www.madshrimps.be/articles/ar...#axzz1abuRwmAl
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post #13 of 35
now these benchmarks look better!
If only they had been able to release it earlier ... I fear they could have had more interest if they could have released earlier.
post #14 of 35
Quote:
Originally Posted by CarlosSpiceyWeiner View Post
Do you have graphs? I'm considering getting a SB now because of the efficiency issue, but I plan to run it at 5.0 Ghz 24/7 folding....
I don't have graphs of the 2600k specifically, just first hand experience. My particular 2600k becomes impossible to cool past about 4.8GHz as power consumption and heat dissipation skyrocket, yet I can cool the same chip passively at 3.8GHz.

Almost every CPU runs into an exponential power curve as you approach it's clock limits.

In general a CPU at ~75% of it's max OC is going to use only a bit over half the power of a CPU at it's (air/water) limit, assuming you are always using the least voltage necessary for a given clock.

Quote:
Originally Posted by Malcom28 View Post
NB scaling doesn't look at all impressive here.

Deneb and Thuban scalled quite well, but even the first gen i7s saw more scaling than these tests.
Edited by Blameless - 10/14/11 at 6:05am
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post #15 of 35
Quote:
Originally Posted by Blameless View Post
I don't have graphs of the 2600k specifically, just first hand experience. My particular 2600k becomes impossible to cool past about 4.8GHz as power consumption and heat dissipation skyrocket, yet I can cool the same chip passively at 3.8GHz.

Almost every CPU runs into an exponential power curve as you approach it's clock limits.

In general a CPU at ~75% of it's max OC is going to use only a bit over half the power of a CPU at it's (air/water) limit, assuming you are always using the least voltage necessary for a given clock.
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post #16 of 35
Yeah I saw the CPU-NB link from madshrimps earlier. It looks like it's back to just upping the HTT and calling it a day, like the old A64 days.

Detailed write-up on XS confirms this:
http://www.xtremesystems.org/forums/...Results-coming!

Quote:
Originally Posted by sin0822@XS
As we increase the HTT we see that Cinebench as well as 3DMark CPU test seems to scale almost perfectly, even with lower memory speed for some of the tests. We also see a need for higher voltage to remain stable as the same CPU frequency. Even with lower CPUNB and HT link speed for the increase HTT (multiplier limited) we see that performance in those benchmarks still increase. SuperPI seems to have no change, but SuperPI seems to like a higher multiplier.

Conclusion: HTT(FSB) needs to be raised for best performance, even if you can only use the multiplier.

Edited by mav451 - 10/15/11 at 2:56pm
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post #17 of 35
Quote:
Originally Posted by disturbed117 View Post
I may get a bd chip yet. anyone know how well the msi 990x boards perform?
Its an MSI so its more likely to explode than anything.

I wouldn't touch an MSI mobo even if you paid me. Not worth risking my other hardware due to their crap mobo's. Especially seeing how much power BD pulls, they will explode almost at stock let alone an OC.

OT - Lets be realistic here though. The simple fact that it needs to be overclocked to come close to a 2600k just proves BD doesn't perform as it should. Yes, they are pretty cheap. But they are cheap because AMD knows they don't perform. And when even the manufacturer knows their product sucks, I can't see why any consumer would buy their product.

All BD has done is given Intel more market share. In the first month or two BD "may" give AMD a slight increase but I think over the lifetime of the architecture, you will see Intel gain more as Intel keep refining their awesome SB architecture while AMD are busy pretty much overhauling BD to make it even worth considering.

Sad times indeed. My first proc was a 3800+ later upgraded to a 4800+. The worst part is, that basically 6 years later, those chips almost beat BD in single threaded performance. Which is just sad
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post #18 of 35
Quote:
Originally Posted by Vengeance47 View Post
OT - Lets be realistic here though. The simple fact that it needs to be overclocked to come close to a 2600k just proves BD doesn't perform as it should. Yes, they are pretty cheap. But they are cheap because AMD knows they don't perform. And when even the manufacturer knows their product sucks, I can't see why any consumer would buy their product.
they werent supposed to compete with 2600. if it does, its more than needed.

the market for products like 2500 and lower is much larger than 2600, top end. aiming for that market is the logical thing to do in business sense.
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post #19 of 35
The performance Rage3D managed to get out of the FX-8150 is pretty impressive. I wish they would have done some i5-2500k testing as well because they make some generalized statements like:

Quote:
Priced against the Intel Core i5 2500K, it's a real fight and shows AMD's marketing smarts - the difference between 2500K and 2600K is minimal in the real world and apparently most users are buying the cheaper processor.
and

Quote:
The clean kill and win isn't here against Intel's top Sandy Bridge. But, AMD hasn't priced it against the 2600K, it's head to head with the 2500K, and in that context AMD's Scorpius platform is a solid buy.
I would have liked to be able to look at the graphs and see just how minimal the difference is.

Also I find this odd: In a lot of their results, the i7-920@4.0ghz is kicking butt! The i7-920 OC wins the following benchmarks: Metal of Honor, Crysis2, Bad Company2, 7-zip(tied for win), WinRar - even beating the i7-2600k @ 4.5ghz. Why do I feel the need to upgrade again?
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post #20 of 35
Quote:
Originally Posted by PERSPOLIS View Post
Here is the link to a very interesting review:

http://www.rage3d.com/reviews/cpu/am.../index.php?p=7

They overclocked both 8150 & 2600k to 4.5 GHz.

What's important is they raised base clock & memory while disabling CnQ and C1E as well as C6!
They also tweaked LLc.
Does anyone else find it interesting that all testers are disabling all the features that lower power consumption - CnQ, C1E, C6, etc. - and then complain about how awful the power consumption is?
I understand to some extent that this allows a higher overclock, but is the slightly increased OCing headroom really worth the abysmal power consumption?
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