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Kaby Lake Overclocking Guide [With Statistics] - Page 221

post #2201 of 2806
Hey guys, thanks for the guide

Is this normal that by increasing core multiplier to x50 and cache x 40 at 1,375 vCore the performance of Ram drops by around 4 % ?
i have used intel extreme tuning utility to test possible overclock, and userbenchmark to see the Oc results.

also i wonder if someone could have take a look at my voltages because i am kinda new to Intel



Thanks
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post #2202 of 2806
Quote:
Originally Posted by logo View Post

Is this normal that by increasing core multiplier to x50 and cache x 40 at 1,375 vCore the performance of Ram drops by around 4 % ?

Yes, lowering the cache frequency will affect RAM performance. Any reason for lowering it from the default of 42x?
post #2203 of 2806
Quote:
Originally Posted by dlss View Post

Yes, lowering the cache frequency will affect RAM performance. Any reason for lowering it from the default of 42x?

Well i though cache x38 was default since my mobo set it that way

I didn't know that x42 was default
My MoBo (gigabyte ga z270x gaming k5) did set the cache multi at x38. Going too try with x42 later and post the results
Quote:
Originally Posted by dlss View Post

Yes, lowering the cache frequency will affect RAM performance. Any reason for lowering it from the default of 42x?

I have though that x38 cache multi is default for i5-7600k since my MoBo set it default to x38, should i change it to x42 ?
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post #2204 of 2806
Quote:
Originally Posted by Xperimental View Post

Username: Xperimental
CPU Model: i7-7700K
Base Clock: 100
Core Multiplier: 50
Core Frequency: 5000
Cache Frequency: 4200
Vcore in UEFI: 1.325V (Adaptive)
Vcore in CPU-Z: 1.312V
FCLK: 1
Cooling Solution: AIO CoolMaster Masterliquid Pro 280, not delidded
Stability Test: RealBench 2.54 - Stress Test 8 hours, 32GB RAM

Batch Number: L704C181 Malaysia
Ram Speed: 3000Mhz 15-17-17-35 @ 1.3530V
Ram Voltage: 1.3530V
VCCIO: Auto
VCCSA: Auto
Motherboard: Z270 Asus Prime Z270-A (BIOS 0906)
LLC Setting: Auto
Misc Comments: no AXV offset used



I was able to run an 8 hour RealBench - Benchmark, by switching LLC -> 5 (used to be auto).
When running the RealBench - Benchmark for 8 hours, the temperature sometimes hit 92 degrees. After I installed my GFX and ran a new benchmark it went up within minutes..

I am looking for options to reduce the core temps while keeping the CPU at 5GHz.
Would it make a difference to use AXV off set? Or disable C status, intel Step stepping?

Any suggestions are most welcome
post #2205 of 2806
Quote:
Originally Posted by Xperimental View Post

I was able to run an 8 hour RealBench - Benchmark, by switching LLC -> 5 (used to be auto).
When running the RealBench - Benchmark for 8 hours, the temperature sometimes hit 92 degrees. After I installed my GFX and ran a new benchmark it went up within minutes..

I am looking for options to reduce the core temps while keeping the CPU at 5GHz.
Would it make a difference to use AXV off set? Or disable C status, intel Step stepping?

Any suggestions are most welcome

I assume that your MoBo is from Gigabyte, you might have the same problem that i had
enter bios and go to smart fan settlings
set water pump to 30 % speed at least because setting it under 30 % doesn't make the pump spin (work) so there is no circulation of liquid
same applies to fans, set them to at least 30 %

although that i have i5-7600k running at 4.4 ghz with a core volt 1.295 i think that your voltage of 1.325 is way too low for 5ghz overclock since i needed at least
1,375 v to run intel benchmark successfully, and even at 1,375 v x5ghz my core temp never overpass 70 degrees with Akasa venom a20 liquid cooling solution
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post #2206 of 2806
Quote:
Originally Posted by Xperimental View Post

I was able to run an 8 hour RealBench - Benchmark, by switching LLC -> 5 (used to be auto).
When running the RealBench - Benchmark for 8 hours, the temperature sometimes hit 92 degrees. After I installed my GFX and ran a new benchmark it went up within minutes..

I am looking for options to reduce the core temps while keeping the CPU at 5GHz.
Would it make a difference to use AXV off set? Or disable C status, intel Step stepping?

Any suggestions are most welcome

AVX offset should help indirectly by allowing to lower the Vcore while remaining stable resulting in lower temps. RAM voltage does heavily influence CPU temps. Between 1.2 V and 1.35 V there could be 5-10 degrees. So try to go with 1.2 V and set RAM frequency and timings to be stable. Try at 1.2V at 2800 MHz with same timings, if it fails to post loosen the timings by 1. Repeat until you manage to POST then do a RAM stability test. Hyper PI with 32 M should give you a pretty good idea. If it gives any errors, your RAM is unstable so you either loosen timings, lower frequency or raise the DRAM voltage by 0.01 V.
    
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post #2207 of 2806
Quote:
Originally Posted by logo View Post

I assume that your MoBo is from Gigabyte, you might have the same problem that i had
enter bios and go to smart fan settlings
set water pump to 30 % speed at least because setting it under 30 % doesn't make the pump spin (work) so there is no circulation of liquid
same applies to fans, set them to at least 30 %

although that i have i5-7600k running at 4.4 ghz with a core volt 1.295 i think that your voltage of 1.325 is way too low for 5ghz overclock since i needed at least
1,375 v to run intel benchmark successfully, and even at 1,375 v x5ghz my core temp never overpass 70 degrees with Akasa venom a20 liquid cooling solution

I am using a different mobo: Asus z270-a Prime.
When I run the tests I set the fans to full.

Don't know about the voltages you are telling me. I followed the ROG Kaby Lake overclock guide. It was stable with RealBench: both benchmark as stress test for at least 8hours.
post #2208 of 2806
Quote:
Originally Posted by logo View Post

I didn't know that x42 was default
My MoBo (gigabyte ga z270x gaming k5) did set the cache multi at x38. Going too try with x42 later and post the results
I have though that x38 cache multi is default for i5-7600k since my MoBo set it default to x38, should i change it to x42 ?

Well, you didn't mention you have i5-7600K so I wrongly assumed you have an i7-7700K.
Yeah, 38x is the stock cache speed for that CPU. smile.gif
post #2209 of 2806
Quote:
Originally Posted by Xperimental View Post

I was able to run an 8 hour RealBench - Benchmark, by switching LLC -> 5 (used to be auto).
When running the RealBench - Benchmark for 8 hours, the temperature sometimes hit 92 degrees. After I installed my GFX and ran a new benchmark it went up within minutes..

I am looking for options to reduce the core temps while keeping the CPU at 5GHz.
Would it make a difference to use AXV off set? Or disable C status, intel Step stepping?

Any suggestions are most welcome

The RealBench stress test also stresses the graphics card, so I think what you are seeing is the CPU cooler sucking in the heated exhaust of the GPU and raising core temps. Apart from lowering what RAM related voltages that you can, which would certainly help, you probably want to look into you case fan setup to try and keep the air going into your CPU cooler as cool as possible.
post #2210 of 2806
Quote:
Originally Posted by dirtyred View Post

AVX offset should help indirectly by allowing to lower the Vcore while remaining stable resulting in lower temps. RAM voltage does heavily influence CPU temps. Between 1.2 V and 1.35 V there could be 5-10 degrees.
I am new to RAM tweaking, but would that be enough? Enough temperature drop and no throttling.

Quote:
Originally Posted by dirtyred View Post

So try to go with 1.2 V and set RAM frequency and timings to be stable. Try at 1.2V at 2800 MHz with same timings, if it fails to post loosen the timings by 1. Repeat until you manage to POST then do a RAM stability test. Hyper PI with 32 M should give you a pretty good idea. If it gives any errors, your RAM is unstable so you either loosen timings, lower frequency or raise the DRAM voltage by 0.01 V.
So I I would summary:
AVX
1) configure AVX offset 2
2) run tests

Memory :
1) Leave frequency (3000Mhz) and timings.
2) set voltage to 1.2V
3) No boot = loosen timings
(what does this mean?)
4) Boot = Run Hyper Pi
5) unstable: loosen timings, lower frequency (not preferred by me) or raise DRAM voltage.

- when tuning timing, frequency and DRAM voltage: in what order should you start tweaking?
- Increasing DRAM voltage means more heat. Does this also automatically increase the CPU SA and CPU VCCIO? And do they generate heat?


Like I said I am new to RAM tweaking. I have a Corsair Vengeance LPX 32GB 3000Mhz kit.
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