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Overclocking with a CPU Multiplier

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  • Overclocking
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  • CPUs
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August 23, 2013 2:49:33 PM

I have tried searching this several times on Google and was never able to find anything, I also was never able to find a program that allowed my to test my clock speed after I overclocked. I balanced my CPU Ratio to x28 and was able to use CPU-Z but it always said my Core Speed was 2800 MHz (The Bus speed X The Multiplier) so what I am trying find out is does the CPU Ratio actually do anything and if it is increasing the MHz or GHz of my CPU how can I clock/benchmark it? I am using the Intel Core i5-3570k and using the ASRock Extreme Tuning Utility to change the CPU Ratio.


Edit:
I have used IntelBurnTest to test my computer and the results were

Time (s)
14.394

Speed (GFlops)
62.0990

Results
3.526496e-002

Incase they have an importance.

More about : overclocking cpu multiplier

a b K Overclocking
a b à CPUs
August 23, 2013 4:17:06 PM

If you are trying to overclock your i5-3570K, you are going the wrong way with the CPU ratio. Stock settings are 34 times the bus speed, for a final clock speed of 3.4 GHz, or 3400 MHz. Your current settings are actually underclocking the processor.

The CPU Ratio is your clock multiplier.

Casey
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August 23, 2013 4:42:51 PM

cklaubur said:
If you are trying to overclock your i5-3570K, you are going the wrong way with the CPU ratio. Stock settings are 34 times the bus speed, for a final clock speed of 3.4 GHz, or 3400 MHz. Your current settings are actually underclocking the processor.

The CPU Ratio is your clock multiplier.

Casey


Would this mean that the CPU has been underclocked the entire time? As it has always been on x16 until I changed it. Should I change it to x34 to make it run at factory settings? Or would I need to change the BCLK Frequency? (Whenever I increased it by about 7 it crashed my computer and I just left it at 100 MHz)

Thanks for the help so far!
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a b K Overclocking
a b à CPUs
August 23, 2013 6:28:53 PM

Not sure what motherboard you are running your i5-3570K on, but the default settings on mine (same processor on an MSI Z77A-GD55) would adjust itself in a range between 16 and 34 by design due to SpeedStep. Setting the CPU ratio to 34 would get you back to stock, and then you can slowly adjust it upwards to overclock it. I'd leave the BCLK alone for now.

Casey
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August 23, 2013 6:33:57 PM

cklaubur said:
Not sure what motherboard you are running your i5-3570K on, but the default settings on mine (same processor on an MSI Z77A-GD55) would adjust itself in a range between 16 and 34 by design due to SpeedStep. Setting the CPU ratio to 34 would get you back to stock, and then you can slowly adjust it upwards to overclock it. I'd leave the BCLK alone for now.

Casey


Thanks for the advice.
I am using the ASRock Z77 Pro 3 motherboard. I am moving the CPU Ratio to x34 right now, I will run a stress test and post the max temperature below.

Max Temp was 64C under Standard Stress using IntelBurnTest (Under a very high test it went up as high as 76-78C) Which I believe is an okay temperaturn to be at under stress, Idle it's about 45-50C I may need to invest in some kind of water cooling if I want to overclock it anymore than that. I might be wrong though and the temperature might be able to go much higher than I think.
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a b K Overclocking
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August 23, 2013 6:56:01 PM

Are you using the stock fan/heatsink? It tends to cool well enough at stock speeds, but doesn't do so well when overclocking.

The reason I ask is because my processor runs at about the same temperatures with a mild overclock to 4.2 GHz, and I am using a Cooler Master Hyper 212 Plus.

Casey
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August 23, 2013 7:02:30 PM

I am using the stock fan and heatsink but I think I will just throw the money out to get a good water cooling system so I can over clock to a higher speed, maybe something around 4.2GHz - 4.5GHz :) 
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a b K Overclocking
a b à CPUs
August 23, 2013 7:13:42 PM

Yeah, I'd upgrade the cooler before overclocking. Your processor should hit 4.2 GHz easily, as long as you can keep it cool.

Casey
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