Haswell - Bclk vs Ratio performance @ same clock speed?

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klepp0906

Gawd
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Jul 1, 2013
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would 2 cpu's running at 4ghz perform the same if the clockspeed was reached by different means? ie: 200bclk x 20ratio vs 100bclk x 40ratio?

Im speaking about haswell chips only.

(sorry I had a much more thorough post typed up that my laptop lovingly deleted. I detest laptops. This is almost a daily occurrence)

Im asking because im considering running with the 125 strap + a few MHz if it will offer some performance benefit like the old days when fsb + lower multi offered much better performance than the same clcokspeed if reached by stock fsb + higher multi.

Finding any info on this is like pulling teeth!!
 
Wow. That was a lot of time wasted lol. Sigh thank you for the info :) with everyone going on about running a high bclk, who cares if the end result is the same. Once I can get back in the bios (hanging on 96 after trying the 167 strap) I'll go back to using the darn multiplier >.<
 
Unlike the LGA775 days, the BCLK does absolutely nothing for performance. It's just a clock generator for which other multipliers are based off of. In the LGA775 days, data actually passed through the FSB, so increasing the FSB actually improved performance.
 
yea, I was under the impression it had atleast a meager benefit. Perhaps based on the fact it sped up other things as well. (mainly the pcie bus) course in that case I can only squeeze a few MHz before it wont post anyhow >.>

took a bios reset but im finally back in, nothing lost but a days worth of tinkering /sigh
 
The PCI-E bus causes instability outside of 100 mhz. You're also changing the SATA and USB frequencies as well, which, like PCI-E devices, do not operate well outside of 100 mhz.
 
Tsumi said:
The PCI-E bus causes instability outside of 100 mhz. You're also changing the SATA and USB frequencies as well, which, like PCI-E devices, do not operate well outside of 100 mhz.
Click to expand...

For clarification, the Haswell BCLK strap doesn't change the SATA, USB, etc. frequencies. It only changes the CPU, RAM, and unclock frequencies.
 
The only thing I can think of that it might do is get you a few extra Mhz. when you are maxing out your stable OC.


IE.

100 x 40 is stable = 4000MHz stable
100 x 41 is unstable = 4100 MHz unstable
101 x 40 is stable = 4040MHz stable
 
yea, at the cost of having to worry about increased clocks in other areas causing instability and/or having to lower the ratio due to the aforementioned and end up w/ lower clocks in other areas.

if ya ask me, ratio is the way to go >.<
 
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