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ASUS P6T (NON-deluxe) / i7-920 Users Club

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stuboyle1

New Member
Joined
Sep 10, 2004
I wanted to start a "self-help" thread for all of us P6T/i7-920 users out there. To start things off, here are some good reviews on the P6T that I've run across:

P6T Reviews
Bjorn3D
Firing Squad
HardOCP
Overclockers Club
Think Computers
Tom's Hardware
Xbit Labs

Other Useful Links
ASUS P6T Support Forum
ASUS Downloads

Current BIOS
0403 3/06/2009 (This is available at the standard download location)
0502 3/25/2009 (This is NOT available yet at the standard download location. Maybe its still a beta.)

Heatsinks/Temps
I started with the stock Intel heatsink and was getting idle temps of about 50C but under load they were going through the roof! So I went shopping for an aftermarket heatsink. Based on this review, I decided on the Xigmatek Dark Knight which cost me $46.99 shipped. I decided on the Dark Knight because it was the cheapest of the best. I really had a battle getting the Intel heatsink off then I found this. Doh! Once I managed to get the stock Intel heatsink off, I sense it wasn't seated very well on the CPU and that there wasn't enough pressure to get good head transfer between the CPU and the heatsink. Installation of the Dark Knight was pretty straightforward. The unit is tall with not a lot of room to spare for the case side cover but that's okay though. I like that the unit is pretty narrow so it really doesn't cover up or restrict access to much on the motherboard. Initial testing on temps are about 33C idle and 56C under full load with all stock voltages and settings. This should give me some room to push things a bit when I get to overclocking.

HardOCP's Overclock
In HardOCP's review, they overclocked the i7-920 to 4.0ghz (200 X 20) with the following voltages:
CPU 1.4375V
CPU PLL 2.1V
RAM 1.70V
QPI 1.40V
IOH 1.36V
IOH PCI 1.8V
ICH 1.40V
ICH PCI 1.8V
 
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EDIT: I believe I am having PSU Issues; this post was written prior to that realization

I've found that the P6T needs more than just CPU and QPI voltage to get perfectly stable under a full load of prime95 small fft, atitool + rthdribl, and intelburntest.

I'm running 4 Ghz @ 200x20 - 3.5 hours stable at above-mentioned full system load
CPU: 1.425v
CPU PLL: 2.1v
QPI: 1.4v
IOH Voltage: 1.26v
DRAM: 1.56
All else on Auto.

I've also tested 3.9 Ghz @ 195x20 - 7.5 hours stable under full system load
CPU: 1.4v
CPU PLL: 2.1v
QPI: 1.4v
IOH Voltage: 1.24v
DRAM: 1.56
All else on Auto.

At first, I found that I would be stable under prime95 w/ full gpu load for 3-12 hours with a high cpu and qpi voltage and the rest on auto, but occasionally my system would mysteriously reboot. And as soon as I put it to full test with intelburntest, it would often reboot in less than 30 minutes.

It was only after I started increasing CPU PLL and IOH Voltage could I get the system to stop rebooting. Of course I only feel comfortable once I test my system for a total of 12 hours under full system load, but it's looking very promising. I'm also fairly sure that IOH voltage is what made the difference because I did try out a slightly higher cpu pll voltage early on in testing and it was only after I manually enterd the IOH voltage did things become stable. However, I'm still in the process of working that out. And once I figure that out, I'll probably start trying to lower QPI and CPU voltage to the minimum necessary (my temps hit 98c under system load although my ambient at the time was super high; 84F/29C ambient -- under prime95 load it is just in the high 80s with such an ambient). But there is still much testing to be done.

It's looking like you can get this board stable intelburntest 24/7 stable at 4 Ghz after all.

-elitesix
 
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Hmm, scratch all of the above. I have a suspicion that I'm having power supply issues -- I have a no-name brand 585watt power supply.
 
Good Luck with your PSU.

Thanks for posting this. I've just ordered the P6T for a new build.
 
Yeah, I've read that overclocking the i7 to 4ghz can draw 400 watts under load, and that my 4830 oc'ed can draw 120 watts or so...so I'm at least at 520 watts for just graphics and cpu, then you have to add in everything else; it's probably bringing my poor psu to its knees :)

EDIT: After monitoring with OCCT 3.0, it seems that my computer reboots when the 3.3v psu line drops below 3.25v...
 
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I don't think the TDP = Power draw exactly. Correct me on this but I doubt it draws that much, I think only water can handle that!
 
16 hours stable under OCCT PSU test (Which alone rebooted my computer at the two above settings in less than 30 minutes) + prime95 large fft + rthdribl:

3.85 Ghz, 19x203 (HT disabled; never had it enabled for any of my tests)
Vcore: 1.275v
QPI: 1.4v
DRAM: 1.56v
Rest Auto.

I notice that the only correlation with rebooting is low QPI voltage or higher clockspeed. Lower vcore would result in bsod. However, a low QPI, such as default 1.2v at 3.85ghz at the above settings, would result in an immediate reboot upon starting occt psu test. Thus, I'm no longer sure if this is a psu issue or a motherboard issue; apparently on the asus forum a few other individuals are having the exact same reboot problem even with the p6t deluxe: http://vip.asus.com/forum/view.aspx...e&id=20090331202617502&page=1&SLanguage=en-us

At 3.91 ghz (19x206) with vcore 1.28v and qpi 1.35v, it would reboot after 7-10 hours under load.

So I'm still not sure what the problem is, but I'm happy my load temps are now high 70s under this setup and may well keep what I have for 24/7 use :)
 
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In particular with new power hungry setups, using no name PSUs regardless of wattage, is asking for trouble.

Trust the name brand of the Power supply more so than watts, welcome to the forums guys.

_____________________
http://www.ocforums.com/showthread.php?t=595403

Intel i7 920 [211] BCLK x 19 = 4.0 GHz @ [1.4000] CPU Voltage & [1.35000] QPI/DRAM Uncore Voltage, Batch 3836A394
3 x 1GB G.SKIL DDR3 1333 (PC3 10666) [DDR3-1691MHz] 10-10-10-24 @ 1.64 DRAM Bus Voltage
ASUS P6T Deluxe v.1 [LGA 1366 Intel X58] BIOS 1102
Thermalright Ultra-120 eXtreme 1366 RT with 120mm Scythe S-Flex F fan
ASUS EAH4850 TOP Radeon HD 4850 512MB @ 680 MHz GPU & 2100 MHz Memory
Antec nine hundred case, two front 120mm fans, one back 120mm Fan, one top 200mm fan
Corsair CMPSU-750TX 750W
 
My problems were definitely psu related. I replaced my no-name 585Watt supply with OCZ Gamexstream 850Watts and all is well :). 4ghz stable!
 
Glad we figured it out, enjoy your 4 GHz goodness.

You'll find it's not the speed any more, it's the poorly written programs that are holding things up now... ;)
 
Ok, what would I need to change

My system:

core i7 920 W/ Xigmatek Dark knight
asus p6t (basic)
ocz platinum ddr3 1600
sapphire hd4870
corsair tx750w
antec 900

I want to run the cpu @ 3.5, what would i need to change? (im noob at overclocking)

-i mean, like what specific lines in the bios would i need to change (and to what)
 
Welcome to the forums 'noob at overclocking' ;):

* AI TWEAKER
Ai Overclock Tuner [Manual]

Intel (R) Turbo Mode Tech [Disabled]

CPU Ratio Setting [20] Locked above 20 but unlocked below.

BCLK Frequency [175]


CPU Voltage [1.x0000] People tend to keep this at 1.35-1.4 since there's a disproportional increase in heat and power consumption when you go higher....

Read:
http://www.ocforums.com/showthread.php?t=595403
 
does about 85 C seem a little high for a stock cooled stock speed 920 in this board? It gets this high when i run p95 for about 3 minutes. this seems a bit ridiculous to me.
 
There's a V2 version of this board out now. Anyone know what the differences are? Is that one better at OCing?
 
I just finished my i7 build (my very first build) 3 weeks ago, would like to OC it soon but have no idea where to learn to do that. I am reigstered with other OC forums (OCAU etc.)

Any tips?
Perhaps a more detailed guide than the one above?

Oh I only want to go to 3.5ghz
 
i7-920 4+ Ghz OC ??

Has anyone been able to get a stable OC over 4.0Ghz?? I have heard of several claims to be stable at 4.2-4.4 on an i7-920, but haven't seen any proof that it is a stable.
 
Yes of course... But you need to get lucky with the chip + have above average components from cooling to power supply...


_____________________
Intel i7 920 [211] BCLK x 19 = 4.0 GHz @ [1.4250] CPU Voltage & [1.35000] QPI/DRAM Uncore Voltage, Batch 3836A394
3 x 1GB G.SKIL DDR3 1333 (PC3 10666) [DDR3-1691MHz] 10-10-10-24 @ 1.64 DRAM Bus Voltage
ASUS P6T Deluxe v.1 [LGA 1366 Intel X58] BIOS 1102
Thermalright Ultra-120 eXtreme 1366 RT with 120mm Scythe S-Flex F fan
ASUS EAH4850 TOP Radeon HD 4850 512MB @ 680 MHz GPU & 2100 MHz Memory
Antec nine hundred case, two front 120mm fans, one back 120mm Fan, one top 200mm fan
Corsair CMPSU-750TX 750W


http://www.ocforums.com/showthread.php?t=595403
 
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