CPU Loosing Overclock While Stressed?

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RicarBit

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Hi folks,

Something really strange here. I've set the overclock profile in bios to XMS and it automatically set turbo multiplier to 38 and Bus Speed to 102.25 MHz so I could get close to 3.9 GHz CPU frequency.

If I set the power profile to Performance in Win10 CPU-Z shows the desired frequency until I start its stress utility, when frequency drops to 3.6 GHz as multiplier is set to 36. As soon as I stop processing stress frequency goes back to 3.8 (see picture).

Temperature after few minutes of stress is stable @ 66ºC
i5 7500, Asus 270H, 16 GBytes DDR4 @ 3,0 GHz

23755369_1725942584096916_3738623388068437794_n.jpg


23905315_1725942577430250_8681259399008058112_n.jpg
 
Solution
geofelt
Without a K processor, you are not overclocking.
What you are seeing is the turbo multiplier.
This multiplier can be increased to as much as 38 for a single thread when conditions permit.
Since you are using a stress test that uses all threads, the turbo multiplier will be less as you are seeing.
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Roland Of Gilead

Roland Of Gilead

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It's a locked CPU. so even though your changing the multiplier it won't work. Your OC is based on a BCLK increase (102.25) which is not advisable for an OC, specially for the limited results one can achieve.
 
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Dunlop0078

Dunlop0078

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What stress test? Does it use AVX instructions? If so do you have an AVX offset set in the bios? If so the CPU will automatically underclock itself whenever it sees AVX instructions. Try an older version of Prime95 like version 26.6 which does not use AVX and see if the clocks still drop when stressed.
 
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geofelt

geofelt

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Without a K processor, you are not overclocking.
What you are seeing is the turbo multiplier.
This multiplier can be increased to as much as 38 for a single thread when conditions permit.
Since you are using a stress test that uses all threads, the turbo multiplier will be less as you are seeing.
 
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Solution
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RicarBit

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Hmmm... ok

So what you guys recommend me to do?

My mainly leisure utilization now is flying X-Plane 11 which is still single threaded oriented processing and it requires huge CPU power. I've recently upgraded my processor from a i5 3450 which I believe I could o/c to 3.7 GHz. That's probably the reason the improvement was not that perceptible. 3DMark showed about 20% improvements in physics tho.

So, should I keep setting how they are now or roll back the overclocking in Bios?

Thank you guys
 
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geofelt

geofelt

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Look at cpu-Z while you are playing x-plane.
If it is single threaded, you should see 3.8 or the max boost multiplier.
Your Z270H motherboard does not support multiplier overclocking.

For the best possible single thread performance use a Z370 based motherboard and a I3-8350K which should overclock to about 5.0 on all cores.
Don't know if that is worth it to you. That would be about $130 for the motherboard and $190 for the 8350K
Alternatively, a I7-7700K should be supported on your motherboard and will turbo up to 4.5 on a single core. That would cost you about $300 to upgrade.

 
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Roland Of Gilead

Roland Of Gilead

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It really depends on what you want to achieve. Your I5-7500 is a capable processor. If you're looking for absolute max gaming FPS, then yes, as others pointed out, an I7-7700k is gonna win out (from the point of view of a faster single core clockspeed, and extra threads). But at gaming, and lets say you have a 1080p monitor, and a GPU like a GTX1060 or RX580, then the 7500 will be only 5% less than the I7 for FPS (this is game dependant, but also when the CPU's are at stock - As you can OC the I7 but not your I5 ) That translates to just a few FPS increase. So as an example, if your playing something like BF4 and your getting 100fps with the I5, will you notice the difference with an I7 (which might get 107fps)?

I guess the point I'm making is, yes, you can get a new chip and spend a couple of hundred bucks on it, and for what? a 5-10% increase in FPS, or some random benchmark score increase that is mostly if not purely synthetic, and has no real world application. Unless you find your current CPU isn't doing what you want, then there isn't really a need to upgrade, apart from having the few extra FPS.
 
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RicarBit

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Thanks guys

My current setup is not bad for what I'm simming right now. Next future investments will be replacing my GTX1060 GBytes and a new 1440p monitor.

My question is: should I keep the current overclocking or go back to a standards frequencies for BCLK and multipliers?

Cheers
 
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