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Help Overclock I5 4670k to 4.3ghz

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#1
Specs:
CPU: I5 4670K
Motherboard: asrock z87 fatal1ty killer
Cooler: Cooler Master 240 Seidon
GPU: Sapphire R9 270x 2gb
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AMBIENT TEMP: 34C
Stress test: AIDA64

I can go at 4.2ghz at 1.247 vcore but when I try 4.3ghz even at 1.305 vcore it still crashes, Am I doing something wrong?

And are there other important things to consider in overclocking rather than Core multiplier and Vcore to improve overclocking?
 
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#2
Specs:
CPU: I5 4670K
Motherboard: asrock z87 fatal1ty killer
Cooler: Cooler Master 240 Seidon
GPU: Sapphire R9 270x 2gb
PSU: Seasonic M12II 750W
Case: NZXT phantom 530
Fans:
Top
- 240 radiator with 2 x 120mm stock fan Push
Rear
- 1 x nzxt FX 140
Front
- 1 x nzxt FZ 200mm
Buttom
- 2 x Corsair SP120

AMBIENT TEMP: 34C
Stress test: AIDA64

I can go at 4.2ghz at 1.247 vcore but when I try 4.3ghz even at 1.305 vcore it still crashes, Am I doing something wrong?

And are there other important things to consider in overclocking rather than Core multiplier and Vcore to improve overclocking?
Try to lower the cpu "cache" clock, and run the RAM @ default speed - i.e., do not OC the RAM.
 
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Cooling Swiftech H220 (2 pumps burnt. Saving it for GPU later...), CM Hyper 212X (in push-pull) for CPU
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#4
Will lowering the CPU cache lower the performance of the CPU?
And my ram is at 1866 so I should go with 1600.
Ideally it's best to run both the core and cache at same frequencies but only a handful of chips can do that at higher clocks WITH high mem clocks. But lowering the cache ratio CAN give you a bit headroom to push the core clock higher. Whether it's of any benefit is solely subject to benchmark scores which you're gonna have to do to figure out.
Yes, do not enable XMP, go with manual and use the "default" which is either 1333 or 1600 depending on your particular kit.
 
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#5
Ideally it's best to run both the core and cache at same frequencies but only a handful of chips can do that at higher clocks WITH high mem clocks. But lowering the cache ratio CAN give you a bit headroom to push the core clock higher. Whether it's of any benefit is solely subject to benchmark scores which you're gonna have to do to figure out.
Yes, do not enable XMP, go with manual and use the "default" which is either 1333 or 1600 depending on your particular kit.
This is what I bought
http://www.gskill.com/en/product/f3-14900cl9d-8gbxl

it is rated at 1866 is this the default and is higher mhz for the ram will make the CPU unstable when overclocking?

How high did you go in your I5 4670k?
 
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#6
This is what I bought
http://www.gskill.com/en/product/f3-14900cl9d-8gbxl

it is rated at 1866 is this the default and is higher mhz for the ram will make the CPU unstable when overclocking?

How high did you go in your I5 4670k?
"SPD Speed 1600MHz" is what is the "default". 1866 is the factory-tested, guaranteed oc speed. Doesn't mean you can or cannot run it this or higher speeds with YOUR CPU at your CPU oc. Since the memory controller is "integrated" in the Haswell chip, the amount of oc you can get from your CPU is inversely proportional to that of the RAM. You can not push both the RAM and the CPU too far simultaneously. Only a very small number of chips can allow that. Yours is obviously not one of those. OC'eing the RAM hardly makes any difference in games. Keep the RAM at 1600 and cache at 3800 (or even 3400, just for testing) and then try 4300 on the core.
I managed 4.5 but it didn't pass all the stress tests even @1.4v so I didn't bother any more and pulled back to 4.4.
 
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#7
"SPD Speed 1600MHz" is what is the "default". 1866 is the factory-tested, guaranteed oc speed. Doesn't mean you can or cannot run it this or higher speeds with YOUR CPU at your CPU oc. Since the memory controller is "integrated" in the Haswell chip, the amount of oc you can get from your CPU is inversely proportional to that of the RAM. You can not push both the RAM and the CPU too far simultaneously. Only a very small number of chips can allow that. Yours is obviously not one of those. OC'eing the RAM hardly makes any difference in games. Keep the RAM at 1600 and cache at 3800 (or even 3400, just for testing) and then try 4300 on the core.
I managed 4.5 but it didn't pass all the stress tests even @1.4v so I didn't bother any more and pulled back to 4.4.
Thank for the big help I am going to try it tonight.

I am just wondering what is you vcore and cache in 4.4ghz and what is your stress test tool?
 
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#8
Thank for the big help I am going to try it tonight.

I am just wondering what is you vcore and cache in 4.4ghz and what is your stress test tool?
Doesn't matter what mine or anybody else's voltages are. Every chip is different. Just try to keep it below 1.3v for everyday use. You MAY try upto 1.4 JUST for testing, but that's really not very safe. Not worth it at all.
I first use Cinebench, and only if that's successful do I try OCCT and lastly AIDA64.

Do keep us updated about the results.
 
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#9
Doesn't matter what mine or anybody else's voltages are. Every chip is different. Just try to keep it below 1.3v for everyday use. You MAY try upto 1.4 JUST for testing, but that's really not very safe. Not worth it at all.
I first use Cinebench, and only if that's successful do I try OCCT and lastly AIDA64.

Do keep us updated about the results.
Why is AIDA64 last on the list is it the most extreme stress test among those 3?

I have use prime95 and at 4.0ghz 1.195 vcore and 34C ambient it reach an average of 80C

but in AIDA64 it only reach 67C whith the same configuration.
 
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#10
Why is AIDA64 last on the list is it the most extreme stress test among those 3?

I have use prime95 and at 4.0ghz 1.195 vcore and 34C ambient it reach an average of 80C

but in AIDA64 it only reach 67C whith the same configuration.
If you wanna test your wrist strength, you don't start running a marathon, do you? Not all the tools are capable of executing all the instructions of your chip. Cinebench is kind of a "quick test". If it fails, no reason to try anything else, is there? OCCT is for the quick "thermal" aspect only. If it gets too hot, then what's the point of trying more, right? AIDA64 is what has all the tricks to test your chip "completely". Only if the other "quick tests" pass there's a point in doing this. But complete testing takes time, hence it's what I do last. Neither OCCT nor Prime95 is catered towards Haswell.
 
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#11
If you wanna test your wrist strength, you don't start running a marathon, do you? Not all the tools are capable of executing all the instructions of your chip. Cinebench is kind of a "quick test". If it fails, no reason to try anything else, is there? OCCT is for the quick "thermal" aspect only. If it gets too hot, then what's the point of trying more, right? AIDA64 is what has all the tricks to test your chip "completely". Only if the other "quick tests" pass there's a point in doing this. But complete testing takes time, hence it's what I do last. Neither OCCT nor Prime95 is catered towards Haswell.
I have use prime95 all the time but I have seen a lot of negative comments on it so I switch to AIDA64 and all the numbers are different that in AIDA64 I have achieve a stable 4.2ghz with 1.247 vcore but in PRIME95 it is unstable even if the vcore is at 1.255. So do you think than I should stop using PRIME95?
 
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#12
Like I said, not all tools execute all the instructions. Some use only a few at a short time and put a huge stress on them. Thorough, complete testing takes much longer - more than 24hrs. If you can't get it stable @ 1.255v then probably you need more volts, but only the error message in your BSOD can tell (well, kind of, not precisely) if that's the case. Try 1.3v and so on. But before doing all that, do lower the cache and DIMM frequencies. AIDA64 is cooler because it didn't perform all the tests during the short time you ran it.
 
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#13
Like I said, not all tools execute all the instructions. Some use only a few at a short time and put a huge stress on them. Thorough, complete testing takes much longer - more than 24hrs. If you can't get it stable @ 1.255v then probably you need more volts, but only the error message in your BSOD can tell (well, kind of, not precisely) if that's the case. Try 1.3v and so on. But before doing all that, do lower the cache and DIMM frequencies. AIDA64 is cooler because it didn't perform all the tests during the short time you ran it.
OK thank you very much I would be posting the results by tomorrow. Thank you for your time kind sir.
 
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#14
OK thank you very much I would be posting the results by tomorrow. Thank you for your time kind sir.
No problem, glad to be of assistance. Good luck :)
 

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#15
What are the rest of your voltage setting? cache voltage, digital and analog i/o, system agent (vccsa)

Those all matter for Haswell overclock, not just vcore and multiplier like it was with Sandy Bridge and Ivy.
 
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#16
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#17
What are the rest of your voltage setting? cache voltage, digital and analog i/o, system agent (vccsa)

Those all matter for Haswell overclock, not just vcore and multiplier like it was with Sandy Bridge and Ivy.
Those only matter for extreme fine tuning - to get the last drop of juice out. If he doesn't oc the cache and RAM, leaving those at auto will be just fine. He may try to LOWER them, however, once he has established his chip's upper limit at acceptable voltages. But that's for later on.
 

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#18
Those only matter for extreme fine tuning - to get the last drop of juice out. If he doesn't oc the cache and RAM, leaving those at auto will be just fine. He may try to LOWER them, however, once he has established his chip's upper limit at acceptable voltages. But that's for later on.
It appears you dont know how to overclock Haswell CORRECTLY. Or how each voltage has an effect on each other.

Im not saying I know how to clock Haswell, but i did spend a whole day on teamspeak and Steam with cadaveca learning how to do my own. Cadaveca is also the author of the TechPowerUp Haswell Overclocking guide.
 
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#19
It appears you dont know how to overclock Haswell CORRECTLY. Or how each voltage has an effect on each other.

Im not saying I know how to clock Haswell, but i did spend a whole day on teamspeak and Steam with cadaveca learning how to do my own. Cadaveca is also the author of the TechPowerUp Haswell Overclocking guide.
And spending the whole day on teamspeak makes you an expert on what other people know? You have jumped into conclusion without understanding what I said.
 
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#21
What's your LLC, try the maximum, I think 1 is max 3 lowest..
Also if you have a option called cpu current raise its %, default is 100 try 110 - 120%


VCCSA offset can help a little too, especially if you have a little weaker build-in memory controller, which appears you do since you need higher voltage in general. Ie 0.030- 0.050v+offfset is more then enough (this can also lower your cpuv a little - up to 0.010v).
You can leave digital& analog IO at auto.
 

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#22
And spending the whole day on teamspeak makes you an expert on what other people know? You have jumped into conclusion without understanding what I said.
I know exactly what you said, and The Hunter is enforcing what Im saying.

OP it might be better if you head over to the Haswell Overclocking thread. More people with knowledge of Haswell Overclocking will help you.
 
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#23
I know exactly what you said, and The Hunter is enforcing what Im saying.

OP it might be better if you head over to the Haswell Overclocking thread. More people with knowledge of Haswell Overclocking will help you.
So you're saying that you can get many hundreds of MHz more OC by tweaking things other than core voltage and multiplier? I know about other parameters, but I don't think they make THAT kind of a difference. The OP didn't mention what his cache frequency was. I gave him THE most crucial tip. If that didn't work, we'd sure try tweaking other things a bit. The op sure knows a bit too. And he sure would let us know about his findings AFTER trying out what I said.
 
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#24
What's your LLC, try the maximum, I think 1 is max 3 lowest..
Also if you have a option called cpu current raise its %, default is 100 try 110 - 120%


VCCSA offset can help a little too, especially if you have a little weaker build-in memory controller, which appears you do since you need higher voltage in general. Ie 0.030- 0.050v+offfset is more then enough (this can also lower your cpuv a little - up to 0.010v).
You can leave digital& analog IO at auto.
Can't change the LLC it is just (enable, disable) in the bios.

Change the vccsa to 0.040

Is the cpuv the cpu input voltage?
 
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#25
cpu ratio: 4.3 ghz
cpu cache ratio: 35 ghz
cpu input voltage: 2.0v
vcore override voltage: 1.317 vcore
cpu cache voltage: 1.230
DRAM Voltage: 1.600v
Ram: 1333mhz

This is my parameters before have achieve 4.3 ghz but not impressed with the temps the maximum 85 so now I am trying Hunter's new info to lower the vcore.

Edit: Not achieve 4.3 ghz on this parameters :(
 
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