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(Before I post some findings let's not dig up this old argument of why SuperPi is not needed, or why single threaded benchmarks is Zzzzzzzzz. It is needed by some as a way of determining custom application performance; it is a time tested benchmark; it is used by major review sites 
)
SuperPi in the Sky
Looking at some of the benchmarks for Skylake and Haswell I noticed that clock for clock SuperPi scores are worse on Skylake.
This is a big disappointment, as usually the tick-tock performance increases as quoted by Intel have generally translated into those performance gains in SuperPi (from Sandybridge to Haswell +15% etc.). But on one site I see this:
SuperPi 1M
i7 6700K 8.643
i7 4790K 8.159
I appreciate the 4790K will ramp up to 4.4Ghz, whilst the 6700K will ramp up to 4.2Ghz. But equalising the clock speeds the 6700K is about 1% behind the 4790K.
Reading Stulid's GA-Z170XP-SLI Review where the 6700K is overclocked to 4.6Ghz, and comparing that to my 4770K clocked at 4.6Ghz reveals this:
SuperPi 1M
i7 6700K @4.6Ghz 8.003
i7 4770K @4.6Ghz 7.846
That puts Skylake as being 2% worse than my 4770K. So much for a "20% improvement" as quote by Intel.
So why is Skylake so bad for this benchmark?
CPU or Chipset Architecture
Is there something different in the processor or chipset that causes this?
Memory
My 4770K is DDR3 at 2133Mhz, whilst Stulid's test was DDR4 at 2800Mhz. I believe SuperPi performance is dependent on mem speed so you would expect the 2800 to be better.
Maybe this is a latency issue?
My timings are: 9-11-10-27-278-2T
SuperFlawed
Maybe SuperPi is misreading the results because of the architecture? Like on some mobos there is an option to correct a 3D gaming benchmark or something.
I am using SuperPi Mod 1.5 XS
)SuperPi in the Sky
Looking at some of the benchmarks for Skylake and Haswell I noticed that clock for clock SuperPi scores are worse on Skylake.
This is a big disappointment, as usually the tick-tock performance increases as quoted by Intel have generally translated into those performance gains in SuperPi (from Sandybridge to Haswell +15% etc.). But on one site I see this:
SuperPi 1M
i7 6700K 8.643
i7 4790K 8.159
I appreciate the 4790K will ramp up to 4.4Ghz, whilst the 6700K will ramp up to 4.2Ghz. But equalising the clock speeds the 6700K is about 1% behind the 4790K.
Reading Stulid's GA-Z170XP-SLI Review where the 6700K is overclocked to 4.6Ghz, and comparing that to my 4770K clocked at 4.6Ghz reveals this:
SuperPi 1M
i7 6700K @4.6Ghz 8.003
i7 4770K @4.6Ghz 7.846
That puts Skylake as being 2% worse than my 4770K. So much for a "20% improvement" as quote by Intel.
So why is Skylake so bad for this benchmark?
CPU or Chipset Architecture
Is there something different in the processor or chipset that causes this?
Memory
My 4770K is DDR3 at 2133Mhz, whilst Stulid's test was DDR4 at 2800Mhz. I believe SuperPi performance is dependent on mem speed so you would expect the 2800 to be better.
Maybe this is a latency issue?
My timings are: 9-11-10-27-278-2T
SuperFlawed
Maybe SuperPi is misreading the results because of the architecture? Like on some mobos there is an option to correct a 3D gaming benchmark or something.
I am using SuperPi Mod 1.5 XS
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