68040/68060 CPU Speed

Steve · 30 November 2012, 20:55

Hi Toni. A quicky question. Is it possible to run emulation at 68060 speed if this processor is selected (and the host CPU is capable) or will this need something like 'Approximate A4000/060 or cycle exact' option?

I am asking because I am upgrading my computer to an Intel Core i7 Ivybridge 3.5Ghz monster and wondered that maybe setting the 'Fastest Possible' option may be too much for some games (I am thinking of 3D ones here not 2D). Would be nce as well to run at approximate 68040 or 68060 speed.

Toni Wilen · 01 December 2012, 14:40

The bigger the CPU model, the bigger the difference between cached and non-cached data. 68040/060 difference (vs older modles) is huge, it is not possible to emulate it, even approximately, at least without emulating caches at least partially (which is slow).

CPU speed throttle option should help but you need to manually find "good enough" setting.

thomas · 01 December 2012, 16:18

There cannot be too fast CPU for 3D games. The faster the CPU is the more FPS you get and the more responsive the game is. With a faster CPU you can enable more details. Speed of characters in the game is controlled by timers and should not be affected by CPU speed, except that they stutter less if the CPU is faster.

Toni Wilen · 01 December 2012, 17:59

Not all 3D games get smoother when CPU gets faster, older ones are unfortunately hardwired to FPS rate, not internal timer rate.

It is also possible internal time calculations under/overflow if CPU is too fast.

alphagemini · 29 May 2014, 08:58

What is the calculating speed difference between 68040 with a maths coprocessor and 68060?

Fackamato · 03 June 2014, 22:38

Quote:

Originally Posted by alphagemini

What is the calculating speed difference between 68040 with a maths coprocessor and 68060?

http://www.nightvzn.net/portfolio/we...ml/a4ktcpu.htm

30 November 2012, 20:55	#1
Steve I Identify as an Ewok Join Date: Jul 2001 Location: North Lincolnshire Age: 45 Posts: 2,356	68040/68060 CPU Speed Hi Toni. A quicky question. Is it possible to run emulation at 68060 speed if this processor is selected (and the host CPU is capable) or will this need something like 'Approximate A4000/060 or cycle exact' option? I am asking because I am upgrading my computer to an Intel Core i7 Ivybridge 3.5Ghz monster and wondered that maybe setting the 'Fastest Possible' option may be too much for some games (I am thinking of 3D ones here not 2D). Would be nce as well to run at approximate 68040 or 68060 speed.

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01 December 2012, 14:40	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,505	The bigger the CPU model, the bigger the difference between cached and non-cached data. 68040/060 difference (vs older modles) is huge, it is not possible to emulate it, even approximately, at least without emulating caches at least partially (which is slow). CPU speed throttle option should help but you need to manually find "good enough" setting.

01 December 2012, 16:18	#3
thomas Registered User Join Date: Jan 2002 Location: Germany Posts: 6,985	There cannot be too fast CPU for 3D games. The faster the CPU is the more FPS you get and the more responsive the game is. With a faster CPU you can enable more details. Speed of characters in the game is controlled by timers and should not be affected by CPU speed, except that they stutter less if the CPU is faster.

01 December 2012, 17:59	#4
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,505	Not all 3D games get smoother when CPU gets faster, older ones are unfortunately hardwired to FPS rate, not internal timer rate. It is also possible internal time calculations under/overflow if CPU is too fast.

29 May 2014, 08:58	#5
alphagemini Registered User Join Date: Nov 2011 Location: Folkestone, Kent Posts: 119	What is the calculating speed difference between 68040 with a maths coprocessor and 68060?

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