Me and Zetr0 done some testing recently with an 040 based accelerater and these seem to have a negative effect on the A1200's IDE, With an Apollo 1240 and Falcon 1240 we were seeing speeds of just about 1.2mb/sec with SFS formatted CF card. Whereas on an 030/060 they were 1.8-2mb/sec.
We also found that the speed from FastATA was slower with a 1240, speed dropped from 4.7mbsec (on the 060 to about 3.7mb/sec on the Falcon 1240)
I think IDE speed is very closely tied to the accelerator and the way it has access to the custom chips, the new ACA accelerators bring huge gains to the IDE, for example on my A600 the ACA630 took my IDE speed from 1.2mb/sec to 2.5mb/sec
To get any decent speed from the 1240 I suggest an IDEFix Express adapter of FastATA, even so as we found it probably wont be as quick as the 030/060 based cards but it will be better.
Steve.
