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Can't fully load the CPU under Prime95

post #1 of 8
Thread Starter 
What a good problem to have, last week I upgraded from a Phenom II X4 955BE (with one bad core) and a Gigabyte GA-870A-UD3. To an i5-4670K and an Asus Z87 Sabertooth. Not only does it look outstanding, but idle CPU temperatures went from 45C (on Phenom) and 16C... 16. (Yes my room is cold) Same cooler (Noctua NH-D14) and fan config.. So the whole point for this thread, was I can't seem to load the CPU.. I want to get a good stress test system in place and get baselines before I touch any OC settings. Call me over cautious but my old system was hardly stable below stock speeds, and this is my work/school/everything PC so stability matters. Anyway, under prime95 blend (perhaps the CPU heavy side would be a better choice) the CPU clocks to about 3.4Ghz and stays at 50% load. Now imho this is because my memory isn't fast enough but I could be missing something simple. So, on a side note, anyone have some rocket ship memory modules they can recommend to take Haswell to the next level?


Any input or comments would be awesome. Thanks for your time smile.gif


Edit: Extra note about the Phenom II temperatures, I had that system for about 4 years. I must have reseated that thing at least 4-6 times, tried every thermal paste under the sun. Idle was 45C with NH-D14 fans connected directly to a 12V line (so max speed) and that CPU would become unstable at 60C. These temperatures are at stock speeds and voltages. (Hopefully I will never have to own another AMD CPU, completely astonished by the efficiency of Haswell)
Edited by timma100 - 10/24/13 at 8:32am
post #2 of 8
try occt or intel burn test.
what memory are you using?
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by l0max View Post

try occt or intel burn test.
what memory are you using?

its a mix (i know its retarded) all the ram is GSkill 1600 C9 Borwn channel has 2GB modules and White Channel has 4GB modules (12GB total)
post #4 of 8
test using pairs instead of a mix of kits to see if there's any difference.
is hyperthreading enabled in the bios? nvm no idea otherwise.
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by l0max View Post

test using pairs instead of a mix of kits to see if there's any difference.
is hyperthreading enabled in the bios? nvm no idea otherwise.

That's not a bad idea at all, considering some Corsair Vengeance Platinum.... But memory overclocks are always so finicky.
post #6 of 8
Usually when prime95 doesn't fully load 100% it's because my overclock is not stable and adding more vcore fixes it. But if this is at stock it could be a different problem. make sure all power saving features like speed step are turned off in bios. I usually leave my memory at stock speeds when testing cpu for first time so I can't imagine it's because your memory is too slow but I could be wrong. Does prime95 show any errors on any of the cores while it's running.
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post #7 of 8
Thread Starter 
Quote:
Originally Posted by strong island 1 View Post

Usually when prime95 doesn't fully load 100% it's because my overclock is not stable and adding more vcore fixes it. But if this is at stock it could be a different problem. make sure all power saving features like speed step are turned off in bios. I usually leave my memory at stock speeds when testing cpu for first time so I can't imagine it's because your memory is too slow but I could be wrong. Does prime95 show any errors on any of the cores while it's running.

No errors, everything is stock but ill check speed step settings. Im sure they're on :\ But it clocks to 3.8 no problem under games. Weird
post #8 of 8
AMD and Intel mount their thermal sensors in completely different locations so any temperature comparisons are meaningless.

Make sure you are using 4 threads of the latest version of Prime95.

http://mersenne.org/freesoft/

What software are you using that reports 50% load? Some of the data in Windows 8 is still a work in progress. Post some pics if you need some help. Looks like you have lots of overclocking headroom so don't be afraid to crank it up. thumb.gif
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