Just in case you were wondering, here's some results from having speedstep on or off. Having not come across much information indicating one way or the other, I did the benchmarks myself and here they are.
The set up is:
i5-750 2.55GHz 8MB L3
Gigabyte GA-P55M-UD2
4 x 2GB Corsair XMS3 1600C8
XFX GTX285 1GB
SuperTalent UltraDrive ME Series 64GB 2.5" MLC SSD
Gigabyte ODIN 800W PSU
Windows XP SP3 32-bit
Speedstep (EIST) enabled in BIOS and Portable/Laptop selected in Power Options for Speedstep On.
Speedstep (EIST) disabled in BIOS and Destop selected in Power Options for Speedstep Off.
If the Power Options are left on Desktop, it makes no difference whether or not Speedstep is Enabled, Disabled or left on Auto with this system. It will function as if Disabled. Unless the correct Power Option (ie Portable/Laptop) is also choosen when Speedstep is Enabled, then Speedstep will not function.
The following two graphs are from 3DMark06 results (default settings). The first is the total 3DMark06 score and the second is the CPU component from the same run.
For those who do not know this benchmarking tool, it is available from http://www.futuremark.com. You can download the free version to try for yourself.
Please note that I prefer leaving speedstep enabled on all my Intel machines, whether they are my own or builds for clients.
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The set up is:
i5-750 2.55GHz 8MB L3
Gigabyte GA-P55M-UD2
4 x 2GB Corsair XMS3 1600C8
XFX GTX285 1GB
SuperTalent UltraDrive ME Series 64GB 2.5" MLC SSD
Gigabyte ODIN 800W PSU
Windows XP SP3 32-bit
Speedstep (EIST) enabled in BIOS and Portable/Laptop selected in Power Options for Speedstep On.
Speedstep (EIST) disabled in BIOS and Destop selected in Power Options for Speedstep Off.
If the Power Options are left on Desktop, it makes no difference whether or not Speedstep is Enabled, Disabled or left on Auto with this system. It will function as if Disabled. Unless the correct Power Option (ie Portable/Laptop) is also choosen when Speedstep is Enabled, then Speedstep will not function.
The following two graphs are from 3DMark06 results (default settings). The first is the total 3DMark06 score and the second is the CPU component from the same run.
For those who do not know this benchmarking tool, it is available from http://www.futuremark.com. You can download the free version to try for yourself.
Please note that I prefer leaving speedstep enabled on all my Intel machines, whether they are my own or builds for clients.