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Z87 Megahertz OC Video?

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Supreme [H]ardness
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Nov 17, 2000
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Anyone else seen this video? Some great information. One thing I notice is they say not to use Prime 95 a couple times and not to prime 95 when voltage is set to adaptive? Also mention that LLC settings aren't as big of an issue as they used to be. Are there any other Asus z87 overclocking guides out there?

http://www.youtube.com/watch?v=1DqIG_89Mcs
 
i didn't watch the video, but the reason why they don't advise using adaptive voltage with prime95 might be because the cpu can actually pull significantly more voltage than the specified adaptive voltage in certain situations (e.g. benchmarking programs that use avx instructions) when overclocking past the cpu's default turbo speed.

here are some observed actual maximum voltages (i5-4670k: 3.4 - 3.8, asus z87-plus, adaptive voltage set to 1.225v):

3.8ghz (no overclock):
prime95 v26.6 - 1.184v
prime95 v27.9 - 1.232v
aida64 stress test - 1.232v
7-zip 9.22 benchmark - 1.184v

3.9:
prime95 v26.6 - 1.232v
prime95 v27.9 - 1.280v
aida64 - 1.280v
7-zip - 1.232v

4.4:
prime95 v26.6 - 1.232v
prime95 v27.9 - 1.296v
aida64 - 1.296v
7-zip - 1.232v

prime95 v27.9 and aida64 use avx instructions, prime95 v26.6 and 7-zip do not.

adaptive voltage isn't exceeded at stock speeds no matter what you throw at it (that .007v is probably ai suite iii measurement error), but the combination of overclocking and avx instructions can cause the specified adaptive voltage to be exceeded significantly.

setting a manual fixed voltage instead of adaptive voltage sets a harder limit, but also locks the cpu to that voltage even when idle.

3.8, 1.275v fixed
prime95 v26.6 - 1.280v
prime95 v27.9 - 1.280v

4.4, 1.275v fixed
prime95 v26.6 - 1.296v
prime96 v26.6 - 1.296v

specified voltage is exceeded slightly when overclocked, but not nearly to the same level as with adaptive voltage, and there's no difference between avx and non-avx.
 
Thx for the info. I am still working on mine.. Found that 4.6 is thermally to much for my setup. Now 4.5ghz I have it set in the bios at 1.240V (1.242v in Aida64). Trying to find my lowest stable voltage. I did find that stepping the cache up to 45 causes me to crash every time I run Aida64. Increasing CPU voltage didn't seem to help with stability when I had that cache value at 45.
 
cache has its own separate voltage setting, you'll need to up that when you overclock the cache. of course doing that increases heat output.
 
Yeah, damn.. I found stable voltage at 1.255V that passed stress testing.. I gotta work on the cache next... but also ran into an issue where my CPU is no longer throttling speed when not under load.
 
you mean your cpu isn't clocking down when idle? make sure speedstep is enabled in the bios and in windows set the power plan to 'balanced'. 'high performance' will lock your cpu in turbo mode.

also, setting a manual voltage won't allow the cpu to reduce voltage when idle.
 
Found it! So the OS will let it throttle down now. Looks like Samsung magician created a power profile. Now I just need the voltage to throttle down!
 
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