Hello, long time everyone.
Have a quick question for the Prime95. How many threads should we run for the gold standard?
Thanks.
HCI memtest is superior to LinX, Prime (large or small), and memtest86+ for determining memory stability.
- Launch one instance per thread supported by CPU (8 instances of HCI memtest for 2600K)
- Set each HCI instance to use an appropriate fraction of the memory...16GB on a 2600K means each HCI instance (there will be 8 instances) are to use 2048 MB.
- Stability Criterion: Must pass 200% coverage minimum, passing 1000% coverage is preferred (considered gold standard)
I would suggest running a bootable memory test instead of one that runs under Windows for checking all the available memory.
There is a deluxe edition of HCI memtest that is available for purchase for $14. Well worth it I would say. I've been having issues for the past month with random BSODs popping up every now and then (it could be days or a week or two in between BSODs) with no rhyme or reason that I could figure out. The dumpfiles indicated that there was a memory corruption issue but when I ran a bootable CD with memtest86+ for over 8 hours it couldn't find a single issue. It could've been that I tested with all RAM inserted although I would think it would still point out that I had a RAM issue, I'd just have to further narrow down the stick. Since it didn't I continued looking elsewhere for possible causes. I found out about HCI memtest and the bootable CD option and figured I'd give it a shot since my other troubleshooting didn't turn up anything.
I tested out my RAM one stick at a time and indeed I do have one bad stick of RAM. It's been removed while I go through the RMA process with Kingston but my system has been stable since. I would recommend getting this memory testing tool if memtest86+ finds nothing but your system is still having issues related to memory.
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Hi!More questions (but I guess no one reading them :-( ):
I'm currently overclocking my i7-4790K. I have no problem getting it stable to run Prime95 at higher clocks with more voltage, but the heat is just killing me. I have a custom water loop but at 4,7 GHz I hit 95 degrees C easily using small FFT. Are large FFT still the way to go?
Also is Linx still to be used? At overclockers.net I read I should use different stability tests, that don't heat up the CPU as much. What would be your advise?
Hi!
Use small FFT for checking the stability of the CPU cores themselves. Their ability to correctly add 2+2 and so on.
Use large FFT for checking the cache and memory subsystem. Their ability to store and retrieve the bits correctly without introducing errors at the voltage and clockspeed for which you have set with your OC'ing efforts.
In short, do both but understand why you are doing them and what it means when either one fails.
The heat may be too high for your liking but this is just a stability test, unless you run Prime95 as an application then it is highly unlikely that your CPU is going to approach those temperatures while running your everyday apps.
But it does throttle at 100 degrees C ;-)
Or perhaps I can live with those few throttles in between as long as it passes the test?
My 4790K is running at 4,7 GHz right now 2h primestable so far, hottest core was 97 degrees, but the average is around 80. This is for large FFT.
You wrote that LinX is better for Core logic, so I use this rather then Small FTT, as the heat is not so much. I changed something in their new version of Prime95 which really heats up those Haswell processors
If you are throttling then the stability test is no longer testing what it needs to test (which is stability at high temperature at the targeted OC clockspeed).
You need to dial back your OC or increase your cooling or decide to not worry about stability. (three options to choose from)
LinX is better for checking high temperature but it doesn't check all the same math operations as Prime95, ideally you should use both programs.
If you are pressed for time or just don't want to get into endless rounds of stability testing then you can drop the small FFT test and just do the LinX test.
I have been running IBT and Prime95 (AVX) for hours on many SB and SB-E based CPU's without a problem only to get a 0x101 bsod the moment I start old Prime95.
That guideline really doesn't apply anymore because Intel has changed the voltage characteristics when processing AVX instructions.
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