I just wanted to ask one simple question. I am planning on selling my 68030 to do an upgrade as the 68030 is too slow or me and the 16 MB RAM will not cut it, even for the Amiga classic.

The question I am asking is...is the difference in speed that much high in a 68040 @ 33 Mhz over 68060 @ 50 Mhz that it is worth it to skip the 68040 all the together and attempt to get my hands on a 68060 @ 50 Mhz.

What's your target machine? A1200 or A3000/4000? And what's your basic usage? I personally find that when primarily using Workbench and related applications are a little faster on a 060 than a good 040, but that it is not a huge difference.

For example a WarpEngine with 40MHz 68040 also provides a good SCSI controller. There definitely is a noticeable difference with the Phase5 Cyberstorm Mk2 when doing CPU intensive things (such making a LHA archive of your complete drive) but it's not stellar. Now given the price difference and availability I'd go for the WE...

Having done the 68030-->68040-->68060 thing I can say that the biggest noticeable difference is from 68030-->68040 (about 6x times faster).  Going from a 68040@40 Mhz-->68060@50 Mhz is quite noticeable as well, about 2-3x times faster again.  Note the 68040 chips get HOT, so I question the reliability of 15-20 year old CPU's running inside A1200 trapdoors.

The thing with an A1200 though is that it has other bottlenecks: AGA, the IDE interface, but the upgraded CPU WILL also improve things here as well, if you use hacks and patches like FBlit, FText.

My advice if you can afford a 68060, buy it.  If not a Warp Engine 68040 @40 Mhz with its SCSI (If its an A3000.A4000,) or an Apollo 1240 or Blizzard 1240 (I think these had recycled 68040's though) will still make you smile, a lot compared to the 68030.

I use a Blizzard 1240/40MHz for 3 years or so.
Of course i have attached on it a heatsink and a cooling fan and i have no stability issues at all.
Although the 060 is the best solution, their prices are ridiculously high and barely affordable.

Depends on what you want. A 68040, even at 28Mhz makes a huge difference over a 68030 at any speed.

Jumping from 68040 to 68060 you will also notice a speed difference. Also the 68060 is more ideal for desktop A1200s as it works on a lower voltage and has no issues with heat. You don't even need a heatsink / fan with an 68060.

Also there are quite a lot of games (even WhdLoad games) which don't run or don't run properly with a 68040. With a 68060 nearly (if not all) all games run fine in WhdLoad.

Then there is price to consider. A 68040 is considerably cheaper and still a very good processor.

I would go for a 68060 if you can but don't be put off. An 040 is brilliant and very very fast too.

There are quite many variables.

If you get Apollo serie 040/060 you get really fast unstandard chip ram access. It really makes you amiga 1200 feel faster than blizzard 060. With games like Quake/Doom/Napalm/Foundation biggest limitation is chip ram speed, so diffrence between 040/060 is not big

With FBlit you can promote Napalm/Foundation to Fast ram and get more speed.

With apollo you get 32mb ram, max 64 IF you have second sim slot installed. With Blizzard you get 128mb ram. Blizzard has also very good SCSI adapter, wich accepts another 128mb ram.

I've 060 66mhz and 040 40mhz on my desk all time

I haven't had big problems with WHDLoad and 040. My main WHDload machine is 040

I dont know where this whole "'040 has trouble with whdload" thing comes from. Ive had no more problems with an '040 than I even did with an '030.
If your main interest is in running whdload though there's no need to go beyond an '030 anyway.

I dont know where this whole "'040 has trouble with whdload" thing comes from. Ive had no more problems with an '040 than I even did with an '030.
If your main interest is in running whdload though there's no need to go beyond an '030 anyway.

The '040 is missing some instructions that are found in '030 CPU's which is what cause some incompatibilities with whdload. I had an Apollo 1240 and I can confirm that about 20-25% of the games (which worked fine with an '030) i tried gave me problems.

'060 CPU's seem to have most if not all of these instructions not found in the '040. In fact every whdload game i threw at my '060 works fine.

As you said though, if all you care about is whdload then a 68030 is the way to go. Cheap, cheerful and ultra compatible.