iPhone Forums - View Single Post

mobilehavoc · 11-13-2007, 02:23 PM

Originally Posted by Tinman

I think the 600 MHz rumors were just that. I have found zero confirmation that the iPhone ever runs at that speed.

Moreover, I found this:
"Now let’s take a look at the CPU speed. Again, sysctl() is our friend, this time using CTL_HW with HW_CPU_FREQ and HW_BUS_FREQ. The results of our test show that the CPU is specified at 400 Mhz with a bus frequency of 100 Mhz.

There have been various hardware reports that place the ARM chip’s frequency above 600 Mhz. Maybe sysctl() is lying to us, or maybe the CPU is clocked down to give improved battery life. Only Apple knows that for sure."

http://furbo.org/2007/08/21/what-the...dont-tell-you/

So it seems the iPhone has indeed been sped up.

--
Mike

Right, I'm not disputing that it's currently running at 400mhz or 412mhz in 1.1.2, but there's a good chance it is spec'd to run at 600mhz or so. The only way to test this is to run sysinfo and at the same time run something that puts 100% load on the CPU. If at 100% load it still runs at 400 or 412mhz then we have our answer.

As an example, set your laptop to maximum power savings mode and you'll notice it will run at the low clock speed most of the time, only jumping to max speed when it hits 80%+ sustained load. This is very common practice.

11-13-2007, 02:23 PM	#9 (permalink)
mobilehavoc Join Date: Jul 2007 Posts: 158 Thanks: 0 Thanked 0 Times in 0 Posts	Originally Posted by Tinman I think the 600 MHz rumors were just that. I have found zero confirmation that the iPhone ever runs at that speed. Moreover, I found this: "Now let’s take a look at the CPU speed. Again, sysctl() is our friend, this time using CTL_HW with HW_CPU_FREQ and HW_BUS_FREQ. The results of our test show that the CPU is specified at 400 Mhz with a bus frequency of 100 Mhz. There have been various hardware reports that place the ARM chip’s frequency above 600 Mhz. Maybe sysctl() is lying to us, or maybe the CPU is clocked down to give improved battery life. Only Apple knows that for sure." http://furbo.org/2007/08/21/what-the...dont-tell-you/ So it seems the iPhone has indeed been sped up. -- Mike Right, I'm not disputing that it's currently running at 400mhz or 412mhz in 1.1.2, but there's a good chance it is spec'd to run at 600mhz or so. The only way to test this is to run sysinfo and at the same time run something that puts 100% load on the CPU. If at 100% load it still runs at 400 or 412mhz then we have our answer. As an example, set your laptop to maximum power savings mode and you'll notice it will run at the low clock speed most of the time, only jumping to max speed when it hits 80%+ sustained load. This is very common practice.