4GHz Deneb OC reported

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O

OCGuy

Lifer
Jul 12, 2000
27,224
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Why does everything behind it say 1.475V? And the first link shows it needing 1.5V+ for 3.4?
 
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Idontcare

Elite Member
Oct 10, 1999
21,110
64
91
I'm assuming the 1.475V is the true Vcore, not stellar but not exactly stratospheric for a 4GHz clockspeed.

I have no idea for the first link, could be he was doing something dumb at first.
 
aigomorla

aigomorla

CPU, Cases&Cooling Mod PC Gaming Mod Elite Member
Super Moderator
Sep 28, 2005
21,067
3,575
126
woot 4ghz barrier broken!

now to hold it there stable!
 
E

Extelleron

Diamond Member
Dec 26, 2005
3,127
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Originally posted by: Idontcare
I'm assuming the 1.475V is the true Vcore, not stellar but not exactly stratospheric for a 4GHz clockspeed.

I have no idea for the first link, could be he was doing something dumb at first.
Click to expand...

The first screen was a C0 ES and that was where the 3.4GHz OC / SuperPi numbers came from. Then this other guy showed up claiming that he had a C2 stepping (presumably Deneb release stepping) and that is this 4GHz OC.

It seems highly likely that this is a fake, but if it is true plus it is a chip representative of the general 45nm Deneb (not a hand picked chip) then the improvement over 65nm B3 is amazing. It still isn't close to what good Yorkfields (Q9650 / QX) can do but it puts AMD back in the game. Probably you would be able to expect a 3.7-3.8GHz stable OC with reasonable voltages on this chip if it were true.
 
V

v8envy

Platinum Member
Sep 7, 2002
2,720
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Originally posted by: Extelleron
It still isn't close to what good Yorkfields (Q9650 / QX) can do but it puts AMD back in the game.
Click to expand...

Might also explain why Intel is pushing to accelerate the Nehalem release schedule. The agressively priced midrange Intel chips would once again keep a lid on what AMD can charge for their premium product.

If AMD can get these out the door fast enough it could be just what the doctor ordered when combined with the 750 chipset.
 
aigomorla

aigomorla

CPU, Cases&Cooling Mod PC Gaming Mod Elite Member
Super Moderator
Sep 28, 2005
21,067
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guys lets not steal the light.

if it isnt fake, 4ghz barrier is broken non the less!

i think thats an outstanding achievement.
 
VirtualLarry

VirtualLarry

No Lifer
Aug 25, 2001
56,587
10,225
126
This is amazingly good news for AMD, if true. I might even pick up a deneb for fun. I know aigo is probably thinking the same thing.
 
nerp

nerp

Diamond Member
Dec 31, 2005
9,865
105
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Go AMD!

Now I just want a 4ghz stock Deneb e version at 45w. :)
 
O

OCGuy

Lifer
Jul 12, 2000
27,224
37
91
As far as voltage tolerances for 45nm CPUs, is there a possiblity that the AMD 45nm could withstand more than the 1.4V that is a commonly accepted Max for the current Intel 45nm? Or that Intel's next gen 45nm could withstand more? Or are they made from the same materials, with the same amount of electromigration, etc?
 
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Idontcare

Elite Member
Oct 10, 1999
21,110
64
91
Originally posted by: Ocguy31
As far as voltage tolerances for 45nm CPUs, is there a possiblity that the AMD 45nm could withstand more than the 1.4V that is a commonly accepted Max for the current Intel 45nm? Or that Intel's next gen 45nm could withstand more? Or are they made from the same materials, with the same amount of electromigration, etc?
Click to expand...

Likely comparable. It depends on soooo many factors but the likely answer is that the chip-to-chip variability in the peak viable voltage is probably much larger than the difference in the mean value for both companies.

Meaning 1.4V isn't likely to kill a chip from either supplier but 1.8V is, how your specific chip handles 1.6V depends mostly on your specific chip and you can't expect to be able to compare your experience with your neighbor's experience in the gray area.

Of more relevance at this point would be the power consumption. 4GHz at 1.5V on Deneb may consume so much power that cooling the thing and remaining small FFT stable just isn't possible without 90C temps.
 
taltamir

taltamir

Lifer
Mar 21, 2004
13,576
6
76
ok i see it now...
i see a 3ghz (1.2v), a 3.2ghz (1.4v), and 3.4 ghz (1.55v) there... With super pi...

then there is one picture showing it at 4ghz @ 1.12v....

For all we know he just set up the multiplier and took a screenshot without it crashing.

And it is an engineering sample, so maybe just a lucky chip...

On the other hand, it might also mean that AMD did finally make a chip that can oc...
That will make me very happy.
 
Quiksilver

Quiksilver

Diamond Member
Jul 3, 2005
4,725
0
71
Originally posted by: taltamir
then there is one picture showing it at 4ghz @ 1.12v....

For all we know he just set up the multiplier and took a screenshot without it crashing.
Click to expand...

While I see a picture showing at least 3 cores @ 100% load @ 1.475....
 
taltamir

taltamir

Lifer
Mar 21, 2004
13,576
6
76
mmm... the AMD oc utility is showing 1.475v, the CPUz on the same picture reads 1.168 (not 1.12, oops)
I would guess the CPUz one is wrong.
 
L

Lonyo

Lifer
Aug 10, 2002
21,938
6
81
Originally posted by: Idontcare
Originally posted by: Ocguy31
As far as voltage tolerances for 45nm CPUs, is there a possiblity that the AMD 45nm could withstand more than the 1.4V that is a commonly accepted Max for the current Intel 45nm? Or that Intel's next gen 45nm could withstand more? Or are they made from the same materials, with the same amount of electromigration, etc?
Click to expand...

Likely comparable. It depends on soooo many factors but the likely answer is that the chip-to-chip variability in the peak viable voltage is probably much larger than the difference in the mean value for both companies.

Meaning 1.4V isn't likely to kill a chip from either supplier but 1.8V is, how your specific chip handles 1.6V depends mostly on your specific chip and you can't expect to be able to compare your experience with your neighbor's experience in the gray area.

Of more relevance at this point would be the power consumption. 4GHz at 1.5V on Deneb may consume so much power that cooling the thing and remaining small FFT stable just isn't possible without 90C temps.
Click to expand...

Is stock voltage likely to be any indicator of what sort of upper voltage levels they will be able to take?
I mean, Yorkie seem to be 1.05~1.15 stock vcore, and the screenshot of the 2.3 shows 1.224v.
Any chance that outside the chips just needing a higher vcore they will also be able to survive a higher vcore than the 45nm Yorkfields?
 
Cookie Monster

Cookie Monster

Diamond Member
May 7, 2005
5,161
32
86
Well this is certainty good news. Maybe this is one of the reasons why intel is pushing for an early release of the nehalem.
 
I

Idontcare

Elite Member
Oct 10, 1999
21,110
64
91
Originally posted by: Lonyo
Is stock voltage likely to be any indicator of what sort of upper voltage levels they will be able to take?
I mean, Yorkie seem to be 1.05~1.15 stock vcore, and the screenshot of the 2.3 shows 1.224v.
Any chance that outside the chips just needing a higher vcore they will also be able to survive a higher vcore than the 45nm Yorkfields?
Click to expand...

It is directly related by way of something called a shmoo plot in the technical lingo.

A shmoo plot is a plot of stable operating voltage versus clockspeed. Most shmoo plots are rate limiting (initially you observe a rapid rise in peak stable clockspeeds for small increases in voltage, followed later by a period of diminishing returns in which significant voltage increases are required with only small gains in peak clockspeed).

So the farther "to the left" your chip's voltage is at the highest clockspeed then that does speak to the likelihood of your chip not reaching that point of diminishing returns as you ramp up the shmoo curve.

I think this linked example of how shmoo plots can be generated in practice is pretty cool: http://www2.imm.dtu.dk/courses/02208/texts/shmoo2.htm

Here's a real-world shmoo plot (of sorts, you have to flip the x and y axes) I created with my QX6700: http://i272.photobucket.com/al...ableVcoreversusGHz.jpg

The caveat of course is that every CPU has its own shmoo plot. Sure they all should be more or less the same but that doesn't guarantee you don't have an outlier whose shmoo plot just goes dead flat really quick at low GHz.
 
F

Foxery

Golden Member
Jan 24, 2008
1,709
0
0
Er. How is the CPU usage in the 4GHz screenshot pegged at 100% if there are no other applications running? I call shens.

The actual tests done @3.4 are, however, very encouraging. If AMD really wises up, they'll release at more interesting clock speeds than the same 2.3 and 2.4 that disappointed the world the first time around.
 
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