When does the iPhone 4 A4 cpu run at 1ghz?
Posted: 18 Jun 2011, 15:39
Hello everyone.
Had a curious feeling and i was just wondering if any of you had any thoughts on this.
According to a few benchmarks I have been looking at and using my own experience I have seen that there are certain times when the performance results between the iPhone 4 and the iPad have been as near as makes no difference, identical. Which shouldnt be the case if the iPhone is running at a max of ~800+ mhz. Now we all know the A4 chip in the iPad is the same one in the iPhone 4. And since the iPhone has a clock speed that is variable and is dynamically clocked depending on system loads...When does the iPhone hit the 1ghz speed? Does it do it when running 3D games or any other tasks that would stress its systems?
Some of the benchmarks clearly show the iPad ahead by some margin due to its permanant 1ghz clock and in others (which arent cpu or gpu bound) they come out even...
So...
basically...
What would give the iPhone cause to run at 1ghz?
I will quote this sources of some of the info i have found in addition to my own...
http://www.fudzilla.com/reviews/item/19 ... ?showall=1
"Whatever its motives may be, Apple decided not to reveal the specifications of its A4 processor during the iPad’s announcement in January, and only revealed the name of the processor itself. Of course, little did the industry know that the company would implement the same processor in its fourth-generation smartphone. Now that the product has materialized and has sold over 1.7 million units within its first three days, we can confirm without question that the device sports the same ARM-based 45nm A4 1GHz chip used in the iPad. But rather than being clocked straight at 1GHz, the A4 processor in the iPhone 4 runs at a variable clockspeed, allowing it to vary in speed and adjust according to application demands. It features a maximum clock of 1GHz just like the iPad, but for most applications it will essentially mimic Intel’s SpeedStep platform by adjusting voltages and clock speeds according to the number of applications running to improve power consumption efficiency."
and...
http://www.everythingicafe.com/forum/th ... led.57950/
"After spending some time talking to the senior iphone tech about my replacement phone last night, he asked if there's any feature requests I had or anything else he could help me with. Firstly, I told him custom text tones and email tones, and 3g hotspot. But then I asked him what the clock speed of the A4 in the iPhone 4 actually was. Was it an 800mhz like speculated. He told me that it's actually a variable clock speed processor, allowing it to vary it's speed with usage, with a max clock of 1ghz just like in the iPad.
Now some of you might say that he was just BSing me, but he really knew his stuff about the iPhone and specifically the 4, so I believe him. Plus a variable clock speed makes sense, and also explains the battery life improvments we are seeing. Plus it seems like an Apple way of doing things. "
Sorry for the longwinded post...
Thoughts anyone?
(ps. I posted this on the apple support forums but they seem to be very apathetic about replying to posts)
Had a curious feeling and i was just wondering if any of you had any thoughts on this.
According to a few benchmarks I have been looking at and using my own experience I have seen that there are certain times when the performance results between the iPhone 4 and the iPad have been as near as makes no difference, identical. Which shouldnt be the case if the iPhone is running at a max of ~800+ mhz. Now we all know the A4 chip in the iPad is the same one in the iPhone 4. And since the iPhone has a clock speed that is variable and is dynamically clocked depending on system loads...When does the iPhone hit the 1ghz speed? Does it do it when running 3D games or any other tasks that would stress its systems?
Some of the benchmarks clearly show the iPad ahead by some margin due to its permanant 1ghz clock and in others (which arent cpu or gpu bound) they come out even...
So...
basically...
What would give the iPhone cause to run at 1ghz?
I will quote this sources of some of the info i have found in addition to my own...
http://www.fudzilla.com/reviews/item/19 ... ?showall=1
"Whatever its motives may be, Apple decided not to reveal the specifications of its A4 processor during the iPad’s announcement in January, and only revealed the name of the processor itself. Of course, little did the industry know that the company would implement the same processor in its fourth-generation smartphone. Now that the product has materialized and has sold over 1.7 million units within its first three days, we can confirm without question that the device sports the same ARM-based 45nm A4 1GHz chip used in the iPad. But rather than being clocked straight at 1GHz, the A4 processor in the iPhone 4 runs at a variable clockspeed, allowing it to vary in speed and adjust according to application demands. It features a maximum clock of 1GHz just like the iPad, but for most applications it will essentially mimic Intel’s SpeedStep platform by adjusting voltages and clock speeds according to the number of applications running to improve power consumption efficiency."
and...
http://www.everythingicafe.com/forum/th ... led.57950/
"After spending some time talking to the senior iphone tech about my replacement phone last night, he asked if there's any feature requests I had or anything else he could help me with. Firstly, I told him custom text tones and email tones, and 3g hotspot. But then I asked him what the clock speed of the A4 in the iPhone 4 actually was. Was it an 800mhz like speculated. He told me that it's actually a variable clock speed processor, allowing it to vary it's speed with usage, with a max clock of 1ghz just like in the iPad.
Now some of you might say that he was just BSing me, but he really knew his stuff about the iPhone and specifically the 4, so I believe him. Plus a variable clock speed makes sense, and also explains the battery life improvments we are seeing. Plus it seems like an Apple way of doing things. "
Sorry for the longwinded post...
Thoughts anyone?
(ps. I posted this on the apple support forums but they seem to be very apathetic about replying to posts)