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Old 01-17-09, 04:26 AM   #13
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Default Re: My overclocking project.. the goal 3.6 Ghz

Quote:
Originally Posted by bob saget View Post
change sig

swi rpl

Keep going wolf, i am cheering for ya
Thank you I´ll try today to push it a little more and cross fingers tht it boots, I have been searching th net for vdroop mods for P35-DS3R but found some bad histories about fried mobos and cpus so I think I´ll pass on it and try to find the correct Vcore to work OK
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Old 01-17-09, 02:26 PM   #14
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Default Re: My overclocking project.. the goal 3.6 Ghz

So apperently my P5B is not the only mobo that suffers from Vdroop... I thought they fixed that on newer boards.
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Old 01-17-09, 09:22 PM   #15
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Default Re: My overclocking project.. the goal 3.6 Ghz

use intel burn test instead of prime95. It will push your cpu a lot harder but a 10 minute IBT = 40+ hours of prime95. Its the same program that intel uses to test their chips. Intitially, Prime95 reported no errors with my overclock when i ran it for 7+ hours, but running IBT for 5 minutes detected unstability, so I up'd my voltage by a little bit and am now IBT stable.

This should save you lots of hours.

http://www.xtremesystems.org/forums/...d.php?t=197835

Quote:
Benefits of using Linpack:
1. More accurate than Prime95 Small FFTs/Blend.
2. Takes less time to tell if your CPU/RAM is unstable than Prime95 (usually
something like 8 minutes Linpack vs 40 hours under Prime95).
3. Use the same stress-testing engine that Intel uses to test their products
before they are packed and put on shelves for sale.
Quote:
Linpack by Intel(R) is an extremely stressful program that will
put even the most powerful X86/X64 CPU in the world at its knees. Load temp
under Linpack will be up to 22*C higher than the competing software Prime95.
This program will make usage of Linpack easier and more practical.

Keep in mind, use this program at your own risk. By using this program, you
agree that neither I nor Intel shall be responsible for including, but not
limited to: burned up CPU, fried motherboard, spontaneous room temperature
increase, hair loss, or mental stress.
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Old 01-17-09, 11:09 PM   #16
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Default Re: My overclocking project.. the goal 3.6 Ghz

Quote:
Originally Posted by methimpikehoses View Post
Over 1.5V (400x9=3.6ghz), and I didn't kept it there long because it was too hot... idled at about 45C.

I currently have it set at 1.47V which reads 1.44V in everest. It's much cooler than 1.5V for some reason, at 440x8=3.52ghz. Still, it idles at 36C, which isn't great, but good enough.
Nice. I can't seem to find a sweet spot for this 780i board at 1600mhz+. It seems to have a lot of fsb holes and even though I can pass a prime95 session, it doesn't start up properly upon reboot. I just did some more testing and I think I have some solid numbers for what I wanted to run.

380 fsb (1520mhz effective)
cpu 3420mhz (380 x 9)
Not sure what the BIOS voltage is yet, as I still have it set to auto. The 780i seems to be pretty good about figuring out the voltages it needs to run the cpu, so I let it figure it out for me and then just manually set it. I'm showing 1.424 in windows using CPU-Z, so I just need to match it. I'm guessing somewhere around 1.46 in bios.
EDIT: CPU Core 1.45V set in bios.
FSB 1.4V
SPP 1.4V (Northbridge)
MCP 1.5V (Stock, southbridge)
SPP -> MCP 1.2V (Stock)

I have to go check what the rest is...

EDIT:
RAM 1.850V
Running underclocked at the moment. 1:1 fsb:dram ratio. 760mhz effective. I'll probably try another divider that is close to 1000mhz and see if it helps or hurts performance.

GTLVREF Lane 0: 00mv
GTLVREF Lane 1: 110mv
GTLVREF Lane 2: 00mv
GTLVREF Lane 3: 00mv

Quote:
Originally Posted by Misfire View Post
use intel burn test instead of prime95. It will push your cpu a lot harder but a 10 minute IBT = 40+ hours of prime95. Its the same program that intel uses to test their chips. Intitially, Prime95 reported no errors with my overclock when i ran it for 7+ hours, but running IBT for 5 minutes detected unstability, so I up'd my voltage by a little bit and am now IBT stable.

This should save you lots of hours.

http://www.xtremesystems.org/forums/...d.php?t=197835
+1. It does load the CPU much better than P95 does. For now I've been using a combo of both. For testing different speeds I just run a quick P95 of like 5 - 10 minutes, until I get to where I want to test longer. Then I've been doing about an hour of P95, followed by 5 runs of linpack. Surprisingly using a blend on P95 I hit about 63C max, and 69C max after 5 runs on linpack. I know I've hit 71C before using higher voltage. P95 usually runs lower than that too if I don't let it go as long.

I've also been trying to make sure that it stays stable when running SLI, so I've been loading up crysis DX10 with 8xAA/16x AF VH settings and looping the CPU and GPU tests a few times. I'm pretty happy with these clocks and as long as everything stays running okay I think it's a pretty good 24/7 setup.


@wolf: Just keep going at it little by little. You will hopefully get there. I've been trying on and off for a while to get stable at around 3.4 and I think I have good numbers now. Voltage is a little lower than what I've tried with before, so it helps keep the heat down. I just checked what I would need to set it in bios, and I'm now running 1.45V in bios at 3420mhz and can pass an hour of P95 and 5 tests of linpack. What this means is that I probably don't need 1.5V to hit 3.6ghz, it's just that the boards fsb doesn't seem to want to stay stable at 1600mhz. If your board is happy with 1600 fsb, you might be able to reach it with less voltage.
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Old 01-19-09, 01:32 PM   #17
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Default Re: My overclocking project.. the goal 3.6 Ghz

Quote:
Originally Posted by Misfire View Post
use intel burn test instead of prime95. It will push your cpu a lot harder but a 10 minute IBT = 40+ hours of prime95. Its the same program that intel uses to test their chips. Intitially, Prime95 reported no errors with my overclock when i ran it for 7+ hours, but running IBT for 5 minutes detected unstability, so I up'd my voltage by a little bit and am now IBT stable.

This should save you lots of hours.

http://www.xtremesystems.org/forums/...d.php?t=197835
Nice find, I get it to 3600Mhz but is very hot for my taste (cores reached 65ºC, vcore on bios at 1,4250V)
Had tried this Intel burn test at 3600Mhz it gave me errors after 10 minutes, prime 95 had been running for 10 hours without error, nice find

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Old 01-19-09, 01:35 PM   #18
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Default Re: My overclocking project.. the goal 3.6 Ghz

Quote:
Originally Posted by Bman212121 View Post
Nice. I can't seem to find a sweet spot for this 780i board at 1600mhz+. It seems to have a lot of fsb holes and even though I can pass a prime95 session, it doesn't start up properly upon reboot. I just did some more testing and I think I have some solid numbers for what I wanted to run.

380 fsb (1520mhz effective)
cpu 3420mhz (380 x 9)
Not sure what the BIOS voltage is yet, as I still have it set to auto. The 780i seems to be pretty good about figuring out the voltages it needs to run the cpu, so I let it figure it out for me and then just manually set it. I'm showing 1.424 in windows using CPU-Z, so I just need to match it. I'm guessing somewhere around 1.46 in bios.
EDIT: CPU Core 1.45V set in bios.
FSB 1.4V
SPP 1.4V (Northbridge)
MCP 1.5V (Stock, southbridge)
SPP -> MCP 1.2V (Stock)

I have to go check what the rest is...

EDIT:
RAM 1.850V
Running underclocked at the moment. 1:1 fsb:dram ratio. 760mhz effective. I'll probably try another divider that is close to 1000mhz and see if it helps or hurts performance.

GTLVREF Lane 0: 00mv
GTLVREF Lane 1: 110mv
GTLVREF Lane 2: 00mv
GTLVREF Lane 3: 00mv



+1. It does load the CPU much better than P95 does. For now I've been using a combo of both. For testing different speeds I just run a quick P95 of like 5 - 10 minutes, until I get to where I want to test longer. Then I've been doing about an hour of P95, followed by 5 runs of linpack. Surprisingly using a blend on P95 I hit about 63C max, and 69C max after 5 runs on linpack. I know I've hit 71C before using higher voltage. P95 usually runs lower than that too if I don't let it go as long.

I've also been trying to make sure that it stays stable when running SLI, so I've been loading up crysis DX10 with 8xAA/16x AF VH settings and looping the CPU and GPU tests a few times. I'm pretty happy with these clocks and as long as everything stays running okay I think it's a pretty good 24/7 setup.


@wolf: Just keep going at it little by little. You will hopefully get there. I've been trying on and off for a while to get stable at around 3.4 and I think I have good numbers now. Voltage is a little lower than what I've tried with before, so it helps keep the heat down. I just checked what I would need to set it in bios, and I'm now running 1.45V in bios at 3420mhz and can pass an hour of P95 and 5 tests of linpack. What this means is that I probably don't need 1.5V to hit 3.6ghz, it's just that the boards fsb doesn't seem to want to stay stable at 1600mhz. If your board is happy with 1600 fsb, you might be able to reach it with less voltage.
Thanks for the tips, I found stability putting the bios settings on auto (by SPD)
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Old 01-19-09, 01:53 PM   #19
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Default Re: My overclocking project.. the goal 3.6 Ghz

Nice work, Wolf! That's a low voltage for 3.6.
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Old 01-20-09, 08:04 AM   #20
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Default Re: My overclocking project.. the goal 3.6 Ghz

Quote:
Originally Posted by methimpikehoses View Post
Nice work, Wolf! That's a low voltage for 3.6.
Yep is a low voltage but i had to upper the FSB Voltage and the MCH voltage to +0.3V on the mobo

Now I´m trying to reduce it a little and checking stability, but I think 65-70ºC is too much for a 24/7 overclock, I need more fans on the case or a more powerful fan on thermalright Ultra 120 Extreme, now I have a Papst @ 1600rpm
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