QuantaCat, on March 12th 2008, 02:31 AM, said:
IE. are you talking about user clocking, or Apple clocking?
The core and memory clock speeds of the MacBook Pro's GPU are variable, depending on what you are doing. Though there is currently no Mac OS X utility to measure this, we were able to confirm the variable frequencies of the 15" 2007 MacBook Pro 2.4, for example, using ATITool under Windows XP Pro (Boot Camp partition):
Idle = 169MHz, Normal = 375MHz, Max (Gaming) = 470MHz
Idle = 100MHz, Normal = 502MHz, Max (Gaming) = 635MHz
A similar variable clocking goes on under Mac OS X, according to ATI engineers.
The 17" 2007 MacBook Pro 2.4 maxed at 520MHz Core and 650MHz Memory. That explains why the 17" is always faster than the 15", all other things being equal. I'm told its max is higher because it has a bigger, more efficient heatsink on the GPU/CPU.
As soon as we have Windows installed on our 2008 15" MacBook Pro, we'll sample the frequencies to see if they are higher than the 2007 model.