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whats the difference between these 2 I7's??

one is a D0 stepping other is c0/c1 stepping.

you want the D0 stepping.

D0 runs cooler
Overclocks better due to not needing a lot of voltage compaired to the c0/c1 stepping.

Also make sure you get the D0 retail, as it will come unlocked and you can there for select the 21x multi.

not all D0s are unlocked from what i have read especily on the OEMs.
 
The 21x multi is only obtained from enabling turbo mode in your bios. None of the i7's are unlocked besides the 965's.

I have 21x on a c0/c1 stepping. And also the "d0's run cooler" thing is a myth. True they require less volts (on average) than a c0/c1, however there was a thread on here that was saying something else counterbalanced the lower volts and therefore brought temps to about same.

By all means, I would buy the D0, but I did want to clear things up for you.
 
if the D0 needs less volts but pulls the same amount of amps it would have to generate less heat? Would be interested if there is a link to say why this is not so?
 
NinjaMaestro said:
The 21x multi is only obtained from enabling turbo mode in your bios. None of the i7's are unlocked besides the 965's.
I have 21x on a c0/c1 stepping. And also the "d0's run cooler" thing is a myth.

but I did want to clear things up for you.
Click to expand...

Nice way to clear things up for him by lieing lol and coming out with untrue facts.

Actually D0s and C0/C1s can obtain 21x without enableing turbo
on my motherboard if i enable turbo yet i get the 21x multi but if i disable turbo i can then select from 18x-21x in multi.
and also my 920 RTL cpu is unlocked as it says so in my bios, want proof ? i can screenshot it in high res for you.

so i will now clear things up for you :D
 
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Caracus2k said:
if the D0 needs less volts but pulls the same amount of amps it would have to generate less heat? Would be interested if there is a link to say why this is not so?
Click to expand...

In fact the D0 pulls less volts but MORE amps and generates more heat.

They do however appear to be better overclockers in general.
 
Greebo said:
In fact the D0 pulls less volts but MORE amps and generates more heat.

They do however appear to be better overclockers in general.
Click to expand...
Agreed. There are several threads on other forums discussing this fact. It seems that the D0's extra overclocking ability comes from a revised manufacturing process, rather than a requirement for less power. D0's do handle like high volts as much as CO's do, but you can get an extra 100 or 200MHz out of them on average.
 
Power is voltage times current, near enough anyway. Assuming near equivalent efficiency (reasonable) , power is proportional to heat output.

The D0's have been measured drawing 20W or so more at the wall, hence run hotter. Testing was done at xtreme, but I don't have a link immediately available I'm afraid. General opinion does strongly favour the D0 chips for overclocking as they hit higher speeds with less voltage.

As an interesting aside to this, processors are rated up to a certain voltage, and C0 and D0 to the same maximum voltage. Higher voltages encourage damage to the chips. However, at the same voltage, D0 chips have higher currents flowing through them. Passing current is also damaging, so I believe a D0 at 1.3V will damage itself faster than a C0 at 1.3V. Electron migration is the big fear once you've got past keeping it cold enough, and that is likely to be strongly correlated with current as it's a probability driven affair.
Time will show whether this is relevant, it is quite possible that there is enough headroom on either chip that they'll show basically the same lifespan when clocked. In case the above is poorly written, which is likely, D0 chips may clock higher on lower volts, but you should expect reduced lifespan relative to C0 at the same voltage. This effect will be more pronounced at higher voltages; within intel's spec you're probably fine either way.
 
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Hmm,

I thought the only unlocked i7 is the 965? A true unlocked i7 would be able to hit a 24x multi if you wanted correct? I have never seen a 965 so I wouldn't know. I know that I can only hit 21x on mine and was told it was locked?

EDIT: just did a google search and can't find any evidence that the d0 steppings (other than the 965's) are unlocked. If someone could please point me in the right direction that would be awesome. I'd like to read up more about these unlocked d0's, heck if they are unlocked I wouldn't mind upgrading to one...
 
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Pretty sure the rumour about them being unlocked is based on turbo mode raising the multiplier by 2 when only one core is in use. Doesn't seem to be any evidence supporting it from where I'm standing either
 
JonJ678 said:
Pretty sure the rumour about them being unlocked is based on turbo mode raising the multiplier by 2 when only one core is in use. Doesn't seem to be any evidence supporting it from where I'm standing either
Click to expand...

So in other words if you don't have a good motherboard, and say you have a dell motherboard, you probably aren't going to be able to change the multi or frequency much and it's like the first Ninja on this thread said and really it's your motherboard and bios that allows this?
 
I have a d0 sitting in the computer I am typing at now and can confirm that the d0 920 does not have an unlocked multipler, I believe that certain asus boards allow you to select a 21 multipler as an extension of intel turbo, most other motherboards including my gigabyte ud5 can't select the 21 multipler but this multipler will come into effect under loading if turbo is enabled
 
ViRuS2k said:
Nice way to clear things up for him by lieing lol and coming out with untrue facts.

Actually D0s and C0/C1s can obtain 21x without enableing turbo
on my motherboard if i enable turbo yet i get the 21x multi but if i disable turbo i can then select from 18x-21x in multi.
and also my 920 RTL cpu is unlocked as it says so in my bios, want proof ? i can screenshot it in high res for you.

so i will now clear things up for you :D
Click to expand...

So this guy does/does not, know what he's talking about?
 
Hard to tell. I'd hazard a guess at yes.
Selecting 21 on some motherboards but not others largely explains the confusion so I'm inclined to believe that happens. It may also say unlocked in his bios, but unlocked in the sense that he can use x21 not that he can use any multi he wants
 
Thank you for clearing him up. I've just been messing around. Of course the 920's are locked. Common knowledge. I was just being a smart-@$$. Sorry :D

And yes you are correct about his motherboard's bios saying it's unlocked and why.
 
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NinjaMaestro said:
The 21x multi is only obtained from enabling turbo mode in your bios. None of the i7's are unlocked besides the 965's.

I have 21x on a c0/c1 stepping. And also the "d0's run cooler" thing is a myth. True they require less volts (on average) than a c0/c1, however there was a thread on here that was saying something else counterbalanced the lower volts and therefore brought temps to about same.

By all means, I would buy the D0, but I did want to clear things up for you.
Click to expand...

A little correction here. Ninja Please accidentally logged into my account (cause we shared a computer at work) and posted this entire message. I do not own an i7 and I don't know anything about overclocking one...yet. So, don't look at NinjaMaestro as a douche for claiming that he has an i7 when I clearly don't according to my sig. Thank you.
 
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