"Enhanced Speedstep Technology" ranges

[ninaholic37]

Hi. Does anyone know where I can find a list of all processors and their normal/highest speedstep frequencies?

My Pentium M 725 laptop (from 2005) has these 6 steps:
- 600 mhz (normal/default speed)
- 800 mhz
- 1.0 mhz
- 1.2 ghz
- 1.4 ghz
- 1.6 ghz (used when loading/doing something intensive)

Was wondering what the range was on some other chips (i.e. new Atom, Celeron/Pentium, i-Core) if they exist in each, and does AMD and ARM have any similar kind of stepping/idle freq technologies?

The low 600mhz default on my laptop is nice because if I use the highest power settings (1600mhz always) the temperature always goes over 60C and therefore the fan keeps coming on, but when speedstep is used it always stays around 40-50C. 600mhz seems ideal for this, so I'm assuming even less mhz as a base/lowest would be enough on most new chips. Any thoughts/opinions?

 

[mikeymikec]

The lowest I think I see these days is about 800MHz, but I don't pay an awful lot of attention to it. I think most modern processors have four P states.

The lowest P state would probably be decided based on the minimum performance one might need from the most basic of tasks, with a little bit of slack so that the fan isn't sounding like it's trying to play a tune each time you click on a web page link

 

[ShintaiDK]

It also depends on desktop/server or laptop SKUs.

SB/IB idle at 1600Mhz for desktop/server and 800 for laptop. Haswell 800 for all.

The info you seek might be in the datasheets.

 

[ninaholic37]

@mikeymikec & ShintaiDK: Thanks for the info. I find it interesting that there doesn't seem to be a site with a list for this on all CPUs (there seems to be a site on the internet for just about everything else :awe: ), but 800mhz idle (and 1600mhz on some desktop chips) sounds like a good ballpark range to assume for now, and knowing that they are called "P-States" gives me a lot more to Google with as well.

The lowest P state would probably be decided based on the minimum performance one might need from the most basic of tasks, with a little bit of slack so that the fan isn't sounding like it's trying to play a tune each time you click on a web page link

Heh, well my fan seems to kick in based on CPU temperature (around 58C) instead of frequency, so if I'm at 41C (average with speedstep on) then load a website, it might go to 42-43C then back down again. It has to stay at 1600mhz consistently for about 5-10 minutes to reach a temperature where the fan needs to kick in, so the "music" wouldn't be very entertaining unless I tape recorded it and played it at 100x speed maybe. :awe:

 

[mikeymikec]

The fan kicks in based on temps as well these days. There's an interesting article about the latest GeForce graphics cards in how the fan management has been tweaked a bit to produce less fan speed variation in exchange for a slightly higher default fan speed (AT's GF 760GTX review mentions it IIRC).

 

[(sic)Klown12]

It also depends on desktop/server or laptop SKUs.

SB/IB idle at 1600Mhz for desktop/server and 800 for laptop. Haswell 800 for all.

The info you seek might be in the datasheets.

My IB-E idles at 1200Mhz

 

[Micrornd]

My IB-E idles at 1200Mhz

My SB and IB servers idle at 1200 also.