Maximum speed for Amiga 4000D accelerator?

[AmigaClassicRule]

I was informed that I can actually have a maximum speed of 105 Mhz speed for an accelerator for the Amiga 4000D! Thus I will be able to run all of NovaCoder's ports including Exult for Ultima 7 at a decent speed on my Amiga 4000D. Which by the way I am super looking forward for that.

So my real question is...what hardware can handle that maximum speed, who is expert at doing that, is it reliable and stable after forcing it run ALMOST double speed capacity, and how much it would cost to achieve this?

I really, really, really would like to do that!

Finally...what is your opinion guys toward Cybervision 64 3D? Is it a custom chipset video card for the classical Amiga similar to the AGA but in an RTG form? Does it produce awesome quality colors, like AGA? Can I run all SDL applications easily on it without any trouble? The ports that NovaCoder have done...can they run beautifully and easily on the video card without any problem? Finally....can I run DOSBox on decent speed say 20 fps on an 68060 accelerator, running at 105 Mhz with 128 MB of RAM on cybervision 64 3D?

[Plaz]

http://www.amiga.org/forums/showthread.php?t=51509

I used to run my Cyberstorm III at ~68mhz with upgraded heatsinks without a problem. It would glitch out at 80. Check the thread above for other's experiences.

Plaz

[Kawazu]

My CS MKII is operating at 72mhz atm and is rock stable at this clock speed but hangs when i try to go to 75mhz

[Evillord68]

I have 2 CSPPC with 80MHZ clocked 68060. Running very well, but fast selected Rams are needed.
Not all Rammodules like it.

[fishy_fiz]

Dosbox, at a rough guess will be something akin to a 16mhz 386 on a 100mhz 060. Framerates will depend on how a game performs on that spec system.
As for cybervision 64/3d its an s3 virge chipset card (what was popular on early pentium era pcs), but on a zorro interface.
Is it a custom chipset, well that depends on a persons perspective, but technically it could be said all gfx cards are.
Comparing it to aga is like chalk and cheese though. Raw theoretical speed, color depths, etc. absolutely destroy aga 9 times out of 10, but system friendly software isnt really coded the same way so you dont get to seet pushed like aga gets pushed. Itll be a lot faster for some things, especially on zorro3, and similar for others

[psxphill]

Is it a custom chipset, well that depends on a persons perspective, but technically it could be said all gfx cards are.

Custom chips are designed for a system, while off the shelf chips are designed and then put into a system.
 
So the graphics chips in PS1 & PS2 are custom, but for PS3 & PS4 the distinction becomes blurry but they are effectively off the shelf.
 
There are no custom 3d graphics chips available for the Amiga.

[fishy_fiz]

As I said it depends on perspective.
Some might be more of the opinion that a custom chipset is something that offloads duties from a cpu in their own (custom) way.
There's no absolute yes/no answer.