Hi guys, just trying to OC my 920 D0 to 4ghz and was after some help. My settings are at 1.28 v.core, 1.30 QPI, 1.6 Dram, Spread spectrum disabled. Now, if I enable Intel EIST I can disable/enable turbo boost, but have no option to change the multiplier if I disable it I can change the multiplier but can't adjust turbo mode. when I go into windows, and run prime, the multiplier bounces all over the place from 19 to 22. Under load it throttles to 20x giving me a clk of 3830 (191 x 20). I have a Msi X58M
also, have overspeed protection off, c1e disabled, hyperthreading off, I've just increased QPI to 1.35. also enabled HPET as bit tech reported it helped stabilized multiplier readjust in CPUs. Also, the only way to change you v.core on this BIOS is by increasing or decreasing it by +/- 0.xx past a given v.core level. Ie you can't change it directly. Any help appreciated Also, apologies for poor grammer etc, writing this on a tablet.... EDIT: Just found an updated BIOS - maybe that will solve the issues.
If the BIOS doesn't work you could try increasing the BCLK and dropping the multi to 20. My P6TD has some sort of power limiter that kicks in over a certain load and drops the turbo boost multiplier. It's possible your board has something similar although I wouldn't have said a 4GHz load was particularly high in power demands..
You know, I think its to do with temperature. When I first boot up P95 it stays at 21x, but as soon as it hits about ~65C it throttles down to 20x multiplier. Also, updated BIOS = no difference
Have you seen these http://forum-en.msi.com/index.php?topic=128953.0 http://forum-en.msi.com/index.php?topic=136635.0 Edit: Try it at BCLK 200 and Multi 20 and if it doesn't throttle then it's probably a power limiter that's kicking in and dropping the turbo multiplier. You may have to slightly increase the vcore/QPI voltage for the higher BCLK.
That exactly what's happening. Most CPUs do it these days. It's just a little premature though. My 940 would go to around 72 before throttling back.
I'm pretty sure that Big Elf is on the right track. I've got the p6t deluxe v2 and came across the same problem. The multi kept dropping from 21 to 20. I could run 215 x21 but it would always throttle back to 20. Bulldog Jeff explained that the cpu was about to exceed the tdp for the chip and so dropped turbo mode. Seems to make sense to me. Only just read your post Bulldog Jeff. Just thought I would pass a bit of your wisdom on.
would try leaving it at standard 20x multi but can't even boot windows at the same v. Was on the 20x multiplier
I'm pretty certain it's not the CPU that's determining the throttling unless it has a defective sensor in which case it would be replaced if it's still under warranty. An extract from an email that I received from Intel about the Core i7 9XX series: '...The TCase is a number established by Intel® as a point of reference in order to understand what could be expected as per normal processor temperature. Anything from the Tcase and below will be the expected temperature of the processor in normal use, anything that doesn't stress out the processor (watching movies, burning CDs, browsing the internet, creating documents, etc.) When the processor is stressed out meaning that you are running heavy processor applications that take control of the CPU or uses it at 100% the temperature will go beyond the Tcase. It can perfectly reach 80 to 85 degrees and the processor will still be OK. The cooling fan is in charge to keep that temperature there. If the processor temperature reaches 100 degrees or more it will send a signal to the motherboard to shut down to prevent mayor damages and most likely it won't be possible to turn the computer back in until it cools down. The normal processor temperature will depend on the chassis type, the hardware involved and the location of the computer, and it usually is lower than the Tcase...'
You'll may have to increase the QPI voltage and possibly the vcore and CPU PLL voltage once you get around a 200 BCLK.
Ok so it doesn't jump at all if I run it at 20 x 200. However, am I correct is saying that you aren't supposed to OC with 20x multipliers?
There's been comment in a number of forums that an even multiplier is worse for overclocking than an odd multiplier. However if it works for you then that's another myth blown. The 2 core i7s I've had have been just as stable on an odd multiplier as they have been on an even one. Your success tends to indicate it's some form of power limiter on the motherboard rather than CPU throttling assuming the temps are about the same. Did you have to increase any voltages when increasing the BCLK?
To eliminate problems with the v.core I'm pumped an extra 0.1v through it (total 1.29v). I've also got the pll at 1.88 and the QPI at 1.35. At those volts the BCLK appears to be stable (for an hour) of prime. However, it also hits 85C under load, so I've got to drop the v.core bit by bit to see the lowest level it'll hit and still be stable. I also have HT off - this seems to add another 5C or so to the max temps.
I've never air cooled a Core i7 but those temps seem high to me. I assume the temps are higher now that the multiplier has stopped jumping around rather than due to the (modest) voltage increases.
1.29 is still very low, it'll take up to 1.45 no probs, a lot of people end up some where round that mark for big overclocks. I used to have mine at 1.37 to get stable @ 4.4ghz. What you also need to take in to account is that prime 95 will beat the crap out of the CPU, in normal use you'll be getting about 10 degrees less, maybe a bit more with a good cooler.
I haven't got a sensor on my 'NB' and have only been able to take readings from the edge of the heatsink with an infra red thermometer (about mid 40s) but 104ºC seems very high and maybe would benefit from a fan over it and/or reseat with fresh TIM or thermal pads.
