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[Coolaler] Core I7 4770K needing 1.596v for 5Ghz? - Page 4

post #31 of 43
What are the chances that we'll be blown away? I'm taking bets with my brother on this one. He's more conservative, and I'm going out on a limb to saying we'll be pleasantly surprised...for once.
post #32 of 43
LOL I keep wondering what the CPU-Z developers are doing because look at this: "NB Frequency: 4001.1 MHz".

Surely this is still wrong, and so is the voltage. And by now we have seen anything from as low as 0.8V all the way up to 2.4V. Maybe because of the new iVR voltage which basically controls everything now. Let's add a few facts:

• VCCIN: SVID 1.8V Nom up to 2.3V+, static V up to 3.04V
• VCORE: dynamic additional V, static V up to 2.0 V
• VRING: dynamic additional V, static V up to 2.0 V
• VGT: dynamic additional V, static V up to 2.0 V

• 1.5V Nom for DDR3
• <=1.65V for XMP
• 1.35V Nom for DDR3L
• VSA, VIOA, VIOD: Up to 500mV Offset V from nominal
post #33 of 43
Any guesses on what the realistic voltages to hit 5 GHZ will be?

Will that be achievable 24/7 stable on air / water?
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post #34 of 43
Well, it takes about 1.52v to 1.63v on FX 8350 to hit 5ghz. \


P = C V^2 f

(where C is capacitance, f is frequency and V is voltage).
http://en.wikipedia.org/wiki/CPU_power_dissipation

I wonder how many people who were cheerleading Ivy Bridge power consumption are going to end up running Haswells with 1.4v+ vcore? 1.6v is gonna be massive.
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post #35 of 43
Quote:
Originally Posted by 2010rig View Post

Any guesses on what the realistic voltages to hit 5 GHZ will be?

Will that be achievable 24/7 stable on air / water?


My guess is that since Haswell is just a slightly refined Ivy, it'll take roughly the same voltage as Ivy.  Hopefully a little less, but probably not any more.  My question is whether they have improved the thermals any over Ivy, and whether the iVR has any impact on the voltage/thermals.

post #36 of 43
I'm more worried about the heat rather than voltages. I skimmed through that thread with Google Translate, and noticed the following:

It took approximately 1.1v for 4GHz and 1.36v for 4.6GHz "stable" (although he mentioned having to increase that slightly to run Cinebench). 4.6GHz apparently idled at 52C in the BIOS and that is water cooled.

Given that he was benching at an unusually low 4.6GHz leads me to believe he couldn't go any higher because of temps. These numbers are lining up with the other leaks, which leads me to believe they are fairly accurate.
 
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post #37 of 43
These results remind me of Ivy Bridge being compared to Sandy Bridge at launch: a small bump to IPC but, thanks to the heat, overclocks are the same or lower than the previous generation.
post #38 of 43
Is Haswell even really a... Tock?
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post #39 of 43
Wow... that's bad....

On another note, this proves that buying a Sandy Bridge chip all those years ago was an excellent purchase tongue.gif
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post #40 of 43
Quote:
Originally Posted by Deceit View Post

Is Haswell even really a... Tock?

If you look at the igpu improvements it definitely is a tock.
     
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