Thanks Jens. In fact with SysInfo I noticed that I had the Fast Ata disabled, now I've got it with Pio 3, as with 4 I was getting messages of DH0 read attempt outside partition, that I must see, anyway this new Cf is giving problems from the beginning, but I bought it after the problem with ACATune and card not supported.
Well, with SysInfo I've got 12,24Mips. This is an screenshot if you find something rare. There's no need to clean any connector 'cause if I just change the Cf Hd with another Workbench I get the Acatune showing it's an ACA1230/56. Now I don't have chipcache, but ACATune keeps telling it's another ACA (and it's the same with -chipcache off).
... Anyway it seems the mips are right, aren't they?