How much faster is the new iMac than the old one?

[nec207]

How much faster is the new iMac than the old one? People say the new iMac is only 20% faster than the old one.

Do you think this new iMac could have been much faster ? Why so thin ? is it not going to get really hot doing intensive gaming so on?

 

[mrfoof82]

The thinness is at the edges. There's still a lot of volume in the center. A Sandy Bridge 27" iMac has 3 fans actually -- one for the CPU, one for the GPU, and one around the HDD.

The Sandy Bridge 27" runs silent under hard gaming. I'd expect the 2012 to do the same, considering the CPU's TDP is 18W lower.

The GTX 680M should be a 60-100% framerate bump in games over the 6970M in the mid-2011. The difference in CPU performance will mostly be around 10-20% since clock speed didn't change, but because Ivy Bridge offers some bennies over Sandy Bridge.

 

[Jinzen]

The thinness is at the edges. There's still a lot of volume in the center. A Sandy Bridge 27" iMac has 3 fans actually -- one for the CPU, one for the GPU, and one around the HDD.

The Sandy Bridge 27" runs silent under hard gaming. I'd expect the 2012 to do the same, considering the CPU's TDP is 18W lower.

The GTX 680M should be a 60-100% framerate bump in games over the 6970M in the mid-2011. The difference in CPU performance will mostly be around 10-20% since clock speed didn't change, but because Ivy Bridge offers some bennies over Sandy Bridge.

Technically, they are the CPU, Optical, and HDD fan. The optical cooled the GPU, which is the most important fan. The HDD fan was basically useless and the CPU at 100% running at the lowest fan speed (1000 RPM) never hit more than 50s Celcius.

The 27" iMac did run very quietly under hard gaming, but it definitely was not a good idea to keep the GPU in the 70s-80s C all the time. I always ramped the fan up to keep the GPU under 70, which made it a bit audible but not bad at all.

However, given the new design, I do not expect the 680M to game silently at all. It will certainly be audible, how much so, will remain to be seen.

 

[nec207]

The thinness is at the edges. There's still a lot of volume in the center. A Sandy Bridge 27" iMac has 3 fans actually -- one for the CPU, one for the GPU, and one around the HDD.

The Sandy Bridge 27" runs silent under hard gaming. I'd expect the 2012 to do the same, considering the CPU's TDP is 18W lower.

The GTX 680M should be a 60-100% framerate bump in games over the 6970M in the mid-2011. The difference in CPU performance will mostly be around 10-20% since clock speed didn't change, but because Ivy Bridge offers some bennies over Sandy Bridge.

What a 60-100% faster GPU but 10-20% faster CPU if I'm reading this right.