i7 920 D0 voltage

[chiLLZ]

hi everyone

I got a i7 920 D0 chip from ocuk and in the bios it says its default voltage is 1.275 even after i load setup defaults. I thought that these chips ran on less voltage then this. is this right? also i can get to 4.2ghz stable but i need 1.375v and and that gives me around 83c of heat.

it seems like everyone is able to run this chip at a much lower voltage at 4.2 ghz is it just that i got a unlucky batch? it is 3908A429 i have to use 1.35v for qpi/vtt also is this normal for the D0?

 

[Blackhorse]

hi everyone

I got a i7 920 D0 chip from ocuk and in the bios it says its default voltage is 1.275 even after i load setup defaults. I thought that these chips ran on less voltage then this. is this right? also i can get to 4.2ghz stable but i need 1.375v and and that gives me around 83c of heat.

it seems like everyone is able to run this chip at a much lower voltage at 4.2 ghz is it just that i got a unlucky batch? it is 3908A429 i have to use 1.35v for qpi/vtt also is this normal for the D0?

First of all why are you running at 4.2ghz? Do you need that speed?
The i7s chips tend to spike dramatically after 3.8ghz if you were only doing gaming i highly reccomend just sticking low for now.
Other than that if you do want to look at 4.2, your going to let us know other things, ie amount of ram, aftermarket cooler, case?

 

[WJA96]

hi everyone

I got a i7 920 D0 chip from ocuk and in the bios it says its default voltage is 1.275 even after i load setup defaults. I thought that these chips ran on less voltage then this. is this right? also i can get to 4.2ghz stable but i need 1.375v and and that gives me around 83c of heat.

it seems like everyone is able to run this chip at a much lower voltage at 4.2 ghz is it just that i got a unlucky batch? it is 3908A429 i have to use 1.35v for qpi/vtt also is this normal for the D0?

Every CPU is different. Every CPU is tested and it's VID determined on a test jig at the Intel plant. If you look at the upper surface of the CPU you will see there are pins on the CPU skirt that allow them to automatically test every CPU as it comes off the production line. As the batch numbers are actually printed on the boxes, if you have a collaborative shopkeeper, and you know a particular batch is good, you should be able to get a good one without opening the box.

It's also hugely useful when someone who owns a 'bad' one publishes the batch because we know to ask and avoid that second-hand.

It's always been a source of contention when a store offers overclocked CPUs or overclocked bundles whether or not they are creaming off the good ones. Given that the batch is printed on the box, and it's a pretty good indication of the performance of the CPU, you would expect a store offering overclocked systems to be selecting known good batches for those systems or packages to avoid warranty issues later. Anyone buying a CPU that is not part of a pre-overclocked system is highly likely to be buying from a pool of stock that has had at least some of the best ones pulled out already.

Caveat emptor.

 

[WJA96]

First of all why are you running at 4.2ghz? Do you need that speed?

Because we can?

The i7s chips tend to spike dramatically after 3.8ghz if you were only doing gaming I highly recommend just sticking low for now.

I think that's very reasonable, except if I'd just spent £200 on a new CPU and everyone else was posting about running 4.2GHz, I'd want the extra 10% over 3.8GHz as well.

Other than that if you do want to look at 4.2, your going to let us know other things, ie amount of ram, aftermarket cooler, case?

He's going to need more than an aftermarket cooler, he's going to need water I'd say.

 

[Blackhorse]

Because we can?



I think that's very reasonable, except if I'd just spent £200 on a new CPU and everyone else was posting about running 4.2GHz, I'd want the extra 10% over 3.8GHz as well.



He's going to need more than an aftermarket cooler, he's going to need water I'd say.

Why water? Mine easilly runs at 4.2ghz on air. Idles at 43, gaming at 60 at itel burns upto 80
But whats the point in stressing a chip beyond anything that i could possibly use it for currently?
Therefore ive knocked it down to 4.0ghz and drop about 7-10 degress from all tests.
Just because ur chip can do it doesnt mean you need to stress the life out of it just yet!

 

[WJA96]

Why water? Mine easilly runs at 4.2ghz on air. Idles at 43, gaming at 60 at itel burns upto 80

What's it doing after 8 hours of prime? Rather more than 80 I think.

But whats the point in stressing a chip beyond anything that i could possibly use it for currently?

If you're not running your CPUs 100% for some reason, then I would indeed query why you would want to bother overclocking, as in my world, even benching is 100% for long periods. I use my systems for my SAP test suite where I emulate the effect of multiple users making heavy transactions on my test database. More clock cycles means quicker testing, hence I have a small air conditioned room with several PCs overclocked as hard as they'll go, running 24/7 at 100% CPU utilization. But those machines are no good if they're not reliable, hence I need to do extensive stress testing of any overclock.

Therefore ive knocked it down to 4.0ghz and drop about 7-10 degress from all tests.

That's fine, but a 5% reduction in CPU speed would mean it would take at least 5% longer for me to complete a test suite run. Given that I test for anything between 10 and 30 working 'pretend' days that could be a big saving and mean I can deliver my application to the customer 5% faster. That's a lot. I generally buy all the latest stuff as soon as it comes out as the faster PCs pay for themselves within 2-3 months.

Just because ur chip can do it doesnt mean you need to stress the life out of it just yet!

Why, what are you waiting for? It has a guaranteed life of 3 years. Just do it man, just do it.

 

[.:SAmSuNG:.]

Get your coat blackhorse.

 

[chiLLZ]

Every CPU is different. Every CPU is tested and it's VID determined on a test jig at the Intel plant. If you look at the upper surface of the CPU you will see there are pins on the CPU skirt that allow them to automatically test every CPU as it comes off the production line. As the batch numbers are actually printed on the boxes, if you have a collaborative shopkeeper, and you know a particular batch is good, you should be able to get a good one without opening the box.

It's also hugely useful when someone who owns a 'bad' one publishes the batch because we know to ask and avoid that second-hand.

It's always been a source of contention when a store offers overclocked CPUs or overclocked bundles whether or not they are creaming off the good ones. Given that the batch is printed on the box, and it's a pretty good indication of the performance of the CPU, you would expect a store offering overclocked systems to be selecting known good batches for those systems or packages to avoid warranty issues later. Anyone buying a CPU that is not part of a pre-overclocked system is highly likely to be buying from a pool of stock that has had at least some of the best ones pulled out already.

Caveat emptor.

Really good info here WJA96, thanks. I had no idea that they actually select a chip just from its batch number. I will know what to do for next time. I guess I am just happy that i can get to 4.2 ghz because i am pretty sure this chip is one that from a not so good batch or just unlucky.

First of all why are you running at 4.2ghz? Do you need that speed?
The i7s chips tend to spike dramatically after 3.8ghz if you were only doing gaming i highly reccomend just sticking low for now.
Other than that if you do want to look at 4.2, your going to let us know other things, ie amount of ram, aftermarket cooler, case?

I dont need it I want it also its pretty obvious that i am not running the stock cooler if i am at around 83c with 1.375v, and that is an ok temp for that voltage on air. also amout of ram in in my sig.

I actually notice a small difference in performance when overclocking the bclk everytime i run a benchmark the numbers go up so its kind of addictive. a fewof my games saw a small increase in performance also, its not about needing the performance blackhorse i dont even need an i7 system to play games well.

 

[Sayso]

Get your coat blackhorse.

hehe...

seems like you have a DO with the properties of the earlier stepping where did you get it from...and (silly question) is it definatly a DO?
80C is high but is still acceptable under stress, if the high temps are bothering you better cooling is needed

 

[Blackhorse]

What's it doing after 8 hours of prime? Rather more than 80 I think.



If you're not running your CPUs 100% for some reason, then I would indeed query why you would want to bother overclocking, as in my world, even benching is 100% for long periods. I use my systems for my SAP test suite where I emulate the effect of multiple users making heavy transactions on my test database. More clock cycles means quicker testing, hence I have a small air conditioned room with several PCs overclocked as hard as they'll go, running 24/7 at 100% CPU utilization. But those machines are no good if they're not reliable, hence I need to do extensive stress testing of any overclock.



That's fine, but a 5% reduction in CPU speed would mean it would take at least 5% longer for me to complete a test suite run. Given that I test for anything between 10 and 30 working 'pretend' days that could be a big saving and mean I can deliver my application to the customer 5% faster. That's a lot. I generally buy all the latest stuff as soon as it comes out as the faster PCs pay for themselves within 2-3 months.



Why, what are you waiting for? It has a guaranteed life of 3 years. Just do it man, just do it.

Completly agree with you, all i was trying to say is if your not needing the power at the moment (ie i only currently use gaming so have no need for 4/8cores running at 4.2ghz) people that use encoding ect that have tasks set for hours at a time, the max possible power you can squeeze from a chip, means the differance between dying of old age waitng or making sure it does it in smallest time possible!
I know what the next question will be! Why have i got a i7 chip if im only gaming?
Well just because i can!

 

[Sayso]

welcome back Blackhorse

 

[capriboy1978]

hmmm

Kinda hope no reputable retailer would cherry pick from their stock and sell 'binned' batches to their loyal customers.

Could ppl with overclockers bundles bought recently post their batch numbers? Also as in OP batch numbers for cpu's bought stand alone.

#edit#

920 D0 batch 3913B213

can only find one more using google -

the 920 D0 3913B213
with 1.425 v for cpu & 1.38 for qpi/vtt now at 21 x 215 = 4518

on a UD5 under water


Hoping I can get away with much less for ~3.8 - 4.0

 

[DavyBoy]

Hi there,

About those high voltages, when I load optimized defaults on my UD5, it automatically sets my Vcore to 1.2675v or something like that when Turbo mode is enabled...

It really isn't a good idea leaving voltages on auto in the BIOS, and especially not when you are overclocking!!

When I first put my i7 system together, I tried overclocking the Bclk to 160MHz and had my multi @ 20x for 3.2GHz o/c, and I left the voltages on auto, and when I checked CPU-Z the Vcore was at 1.365v or thereabouts!!!

You are best manually setting your Vcore, VDimm and QPI/Vtt as auto settings always makes them much higher than they need to be..

Also, your QPI doesn't seem high to me, 1.35v isn't to high.. I think that is about the norm for a D0...

And as WJA96 has already stated, lots of people post on forums which batch their processor is, as this can be used as an indication as to how well they will o/c, though this isn't 100% fullproof imo, as their can be bad CPU's from any batch... but a lot of people try to source a specific batch of processor when they buy their cpu's...

 

[chiLLZ]

I only had it on auto to see what the default voltages were, and it defaulted to 1.275 which i thought was high. i forgot about turbo so i am going to look again. I dont run the voltages on auto when overclocking. I was trying to understand why the default voltage was so high by setting things on auto as i had read about some chips having a higher default voltage.

EDIT:
just checked, it gives me the same default voltage in the bios with turbo on or off, i thought the d0 would run on a default voltage of 1.15 or something not 1.275.

 

[WJA96]

It is a very high VID for a D0, it's almost as if it was a C0.

As for speed-binning, I personally have a very good relationship with my supplier, and they will attempt to get me specific batch numbers if I request them. Most computer shops have at least one enthusiast on their staff and that's the one you want to cultivate

My supplier opens all the boxes and labels the CPUs so they know which ones are theirs (anti-fraud), but I know they do a little 'testing' of each batch as well. They will actually call me up if they get some good ones in.

It probably helps that I typically want between 5 and 10 CPUs at any one time, plus motherboards if it's a major system refresh.

 

[chiLLZ]

nice, I dont know any suppliers very well so next time i will have to resort to bribery

This chip is definatly a D0 i checked it before it was put in and its a lot better then the c0 i had.