[AJLarson]

Can someone explain QPI on the i7 cores?

 

[XFreeRollerX]

try it

 

[zlojack]

Quote:

Originally Posted by {core2duo}werd that's disabled, but that has been there since the late p4 days. i asked Asus when i called and they said that was not the option i was looking for anyways.

Hrm...ok.

(I don't have the board, just asked someone who does.)

I guess I'll find out later this week.

 

[bowman]

Quote:

Originally Posted by AJLarson Can someone explain QPI on the i7 cores?

You mean the base clock which a lot of people illiterately call the 'QPI clock' or the QPI system bus?

Base clock (the 133MHz figure): http://en.wikipedia.org/wiki/Reference_clock

QPI link: http://en.wikipedia.org/wiki/Intel_Q...h_Interconnect

 

[CDMAN]

Nice work man. I was thinking of going to water cooling, but I see that your temps are just about what I have at 4.1 so I may hold off if I done need to. I will take a reading tonight at 4.4 to see what my temps are.

 

[XFreeRollerX]

That picture is horrible dude post it in a better res. I cant read anything on CPUZ

 

[Toonshorty]

I can, but only just. I think thats 4.1GHz.

 

[bowman]

Quote:

Originally Posted by XFreeRollerX That picture is horrible dude post it in a better res. I cant read anything on CPUZ

1.448V, 4142.7MHz, multiplier x31, refclock 133MHz, QPI link 3207.5MHz

 

[gooddog]

Careful on voltage.
The new max is NOT really 1.55. That is the absolute max voltage. See quote below.

It is around 1.375.

1.55 is the voltage after which you may not recover, even when you drop the voltage below 1.375 again.

From the PDF
http://download.intel.com/design/pro...hts/320834.pdf

Quote:

Table 2-6 specifies absolute maximum and minimum ratings, which lie outside the functional limits of the processor. Only within specified operation limits can functionality and long-term reliability be expected. At conditions outside functional operation condition limits, but within absolute maximum and minimum ratings, neither functionality nor long-term reliability can be expected. If a device is returned to conditions within functional operation limits after having been subjected to conditions outside these limits, but within the absolute maximum and minimum ratings, the device may be functional, but with its lifetime degraded depending on exposure to conditions exceeding the functional operation condition limits. At conditions exceeding absolute maximum and minimum ratings, neither functionality nor long-term reliability can be expected. Moreover, if a device is subjected to these conditions for any length of time then, when returned to conditions within the functional operating condition limits, it will either not function or its reliability will be severely degraded. Although the processor contains protective circuitry to resist damage from Electro- Static Discharge (ESD), precautions should always be taken to avoid high static voltages or electric fields.

 

[zlojack]

So basically, this is the 1.45v limit that the Penryns had.

1.36 were "operation condition limits" and 1.45 was absolute maximum (though a lot of people went up to 1.4v+ for 24/7 and were fine)

 

[CDMAN]

Quote:

Originally Posted by XFreeRollerX That picture is horrible dude post it in a better res. I cant read anything on CPUZ

I will take some better pics when I get off of work. Also If you stay at 1.45 volts for the core, and 1.65 for the Dimms you will be fine. Here is some info to help you out.

How to find max Bclock:
Bclock 133Mhz
CPU Multiplier 12x/14x
Uncore Multiplier 16x or higher
QPI Multiplier 18x
Memory Multiplier 8x or lower
Vcore 1.25v
VTT 1.45v
Vdimm 1.65v

push up the Bclock and increase VTT and QPI volts to get higher.
Max 100% safe VTT seems to be 1.65v

How to find max Mem clock:
Bclock 133Mhz
CPU Multiplier 12x/14x
Uncore Multiplier 16x or higher
QPI Multiplier 18x
Highest Memory Multiplier
Vcore 1.25v
VTT 1.45v
Vdimm 1.65v

push up the Bclock and increase VTT and Vdimm to get higher.
more vdimm and vtt than 1.65v at your own risk
1.8vdimm should be 100% safe though

How to find max CPU Clocks on i7-940/i7-920:
max Bclock
CPU Multiplier 15x
Uncore Multiplier 16x or higher
QPI Multiplier 18x
Memory Multiplier 8x or lower
Vcore 1.25v
VTT 1.45v
Vdimm 1.65v

increase CPU multipliers step by step, push up vcore to get higher clocks stable. if you cant get a multiplier stable, reduce Bclock until your stable.
Max bclock for high multis is slightly lower than for low multis.

 

[{core2duo}werd]

Quote:

Originally Posted by gooddog Careful on voltage. The new max is NOT really 1.55. That is the absolute max voltage. See quote below. It is around 1.375. 1.55 is the voltage after which you may not recover, even when you drop the voltage below 1.375 again. From the PDF http://download.intel.com/design/pro...hts/320834.pdf

it says that 1.55 is the absolute max, and i wouldn't push it that high, but it doe NOT say that 1.375 is the maximum safest voltage.

edit maybe you are confused because it says the max vid is 1.375. that is the max stock voltage they will make a chip with, and there is always room above that for overclocking.

 

[mr.derp]

Im liking nehelem a lot, but Im willing to wait for AM3 to come around because I want to see if it competes at all before I buy anything. I think these overclocks are pretty sweet and it would be even sweeter if the max voltage is 1.55.

 

[error10]

Quote:

Originally Posted by CDMAN Nice work man. I was thinking of going to water cooling, but I see that your temps are just about what I have at 4.1 so I may hold off if I done need to. I will take a reading tonight at 4.4 to see what my temps are.

You probably need to reseat your HSF. You shouldn't have hit PROCHOT# during your bench. (That means your CPU temp exceeded Tjmax.)

 

[{core2duo}werd]

Quote:

Originally Posted by error10 You probably need to reseat your HSF. You shouldn't have hit PROCHOT# during your bench. (That means your CPU temp exceeded Tjmax.)

yeah, WOAH those are idle temps. mine were load.

 

[CDMAN]

Yeah, I know. Once I get my mounting kit this afternoon, I will reseat the HSF.

 

[gooddog]

Quote:

Originally Posted by {core2duo}werd it says that 1.55 is the absolute max, and i wouldn't push it that high, but it doe NOT say that 1.375 is the maximum safest voltage. edit maybe you are confused because it says the max vid is 1.375. that is the max stock voltage they will make a chip with, and there is always room above that for overclocking.

That's the problem - open to interpretation.

I think the key phrase is:

Quote:

At conditions outside functional operation condition limits but within absolute maximum and minimum ratings, neither functionality nor long-term reliability can be expected.

I take 1.375 as the functional operation condition limits, and 1.55 as the max ratings.

So I read this as 1.375 as max safe.

 

[error10]

Quote:

Originally Posted by CDMAN Yeah, I know. Once I get my mounting kit this afternoon, I will reseat the HSF.

Don't forget to re-bench, too. When your CPU runs that hot it automatically downclocks itself to as low as 12.5% of its speed. (Unless you disabled that feature in BIOS, on the advice of some OCer, but that seems like a good way to fry your chip.)

 

[zlojack]

Quote:

Originally Posted by gooddog That's the problem - open to interpretation. I think the key phrase is: I take 1.375 as the functional operation condition limits, and 1.55 as the max ratings. So I read this as 1.375 as max safe.

Where do you get 1.375 from?

The VID range?

 

[gooddog]

Quote:

Originally Posted by zlojack Where do you get 1.375 from? The VID range?

From the same pdf. Table 2.7. It is the VID range.

Again, I can be wrong, but I am sure that 1.55 is not the safe voltage.