How fast is the Fastest 68882?

[derringer3]

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.  


So my question is what was the fastest 68882 ever made, and how many Flops it can produce?

[derringer3]

I think for gloom deluxe it is not required an fpu. But i think it uses if it found. Whoever It is much faster when i doubled the fpu clock. At the same speed i can run it on twice larger window, with 1*1 pixel. And it is only the demo version.

Anyway in winxp there is a program called fraps, it can show any srceen's FPS. Its quiet good application to measure some 3d games. Any similar amiga program?

Unfortunatelly the Cpu don't use the crystal on the turbo board. It is uses the a500 clock i think. Just the Fpu use it. The Cpu clock constantly 14.2Mhz no matter which crystal i used. (If somebody do a hack for faster cpu let me now.)

[derringer3]

Have anybody ever try it on 66MHz?

Or anybody can tell me which the higher -stable- Mhz of an 68882/50Mhz?