Mediator voor A4000D without fast turboboard ...

[Lemmink]

-edit- by the way . . .a Mediator and a PowerFlyer with a 040@25Mhz card!!! mhhh not enought IMHO

As soon as i'll receive my new 68040@33Mhz (40Mhz mask), i'll tell you if you can upgrade your CPU card. (only 12,90 EUR from Vesalia)

I have to agree you won't use a PCI Board to it's full extend with a mere A3640. In your setup the bus is not the bottleneck, ZIII could handle more then an A3640 could dish out so I don't expect do see more performance from a VooDoo3 the from a ZIII graphicscard.
Ths Problem with the A3640 is that is does not have it's own RAM, so it has to use the A4000 onboard RAM wich is terribly slow. On some occasions an A1200 with a Blizzard 1230 with Fastram runs circles around an A4000 with an A3640.
To make it short, just get ANY accelerator for the A4000 with could take it's own RAM and performance will increase signifficantly.

[Lemmink]

With those Vesalia 68040 cpu and for only 12,90EUR, you can OC without problem untill 40 Mhz (it is a 40 Mhz mask one)

I doubt that you could overclock an A3640 to 40 MHz, as it isn`t just the procesor that has to play along it`s all the other logic on this board too. For 33 MHz I would give a 95% chance that it will work. Remember, unlike a 25MHz CS MKII all the other pieces on this board were only designed to work with 25MHz. Depending on how much the actual parts exceeded the produktion specification they could take more, but for 40 MHz I only see a 1% chance at best.

And then again what it the point in overclocking an A3640 as it is the slow RAM-access to the MOBO that is holding it down, so increasing the clockrate will not make it that much faster.

[Lemmink]

But i have an A4000 CPU board that was sold in 3 models: (Hardital PowerChanger).

All right the PowerChanger is a complete different talk, it was designed with 40 MHz in mind. Sure pumping up the clock will speed up performance but the gain isn`t as big as it would have been with a card with its own RAM.

I don`t know how it is in Italy, but here in Germany it is no Problem getting a 040 CS MK II for under 100 EUR
OK about 20 EUR for overclocking your board will be cheaper, but does that make sense today unless its your test `n toy Amiga ;-)