derringer3 wrote:
Recently i decided that i will speed up my mtec 68030 board. It is the version for a500/1000/2000. Originally it contains a 68030@14,2Mhz and a 68882@20MHz. (the chips are both clocked at 16MHz by factory.)
Unfortunatelly only the FPU speed can be changed. SO bad...
So the result is:
68882 at 20Mhz: 0.48Mflops
68882 at 24Mhz: 0.51Mflops
68882 at 27Mhz: 0.58Mflops
68882 at 32Mhz: 0.68Mflops
68882 at 40Mhz: 0.79Mflops
Sysinfo v3.24 and Sysspeed says exactly the same numbers in Mflops, but in MIPs they say that my 68030 is 2.61Mips and 4,48Mips. Strange.
AIBB show the difference but it say that the difference between 68882@20Mhz and 68882@40Mhz is only 2-3%. Anyway AIBB shows the correct MHz datas for 20,24,27,32 settings, but when i use 40Mhz oscillator it says that is only clocked at 33,4MHz. I think it is wrong because the difference in Mflops reveals the real difference.
In real life test, for example gloom deluxe, is running much faster at 40Mhz than 20Mhz.
This is bizzare. I am sure gloom deluxe made no use of the FPU.
Is it possible that your CPU clock is derived from the same crystal?
