More photos:

Is this a question, or are you going to document comparing them?

But of course the AMD is faster, because it runs at a 33% higher clock rate and has the same features like 16 KB WB L1 cache etc.

Well, what do you think ?
I don't know much about the internals of these CPU's.

Intel DX2/DX4 Overdrive CPUs perform absolutely identical to the normal DX2/DX4 CPUs.

If you are running them on the same motherboard they should perform identically to their 'native' 3.3V counterpart. It's the same core after all. 😀
But running them on a motherboard with 3.3V support kind of defeats their purpose.

The AMD CPU box has a long lists of computers that are NOT compatible with this CPU.
I think it is because the AMD overdrive CPU has an extra pin to disable the onboard CPU.
What do you think ?
I don't know how the extra pin works ?
Is it needed or not in a regular 486 socket ?

Intel486dx33 wrote:

The AMD CPU box has a long lists of computer that are NOT compatible with this CPU. I think it is because the AMD overdrive CPU […]
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The AMD CPU box has a long lists of computer that are NOT compatible with this CPU.
I think it is because the AMD overdrive CPU has an extra pin to disable the onboard CPU.
What do you think ?
I don't know how the extra pin works ?
Is it needed or not in a regular 486 socket ?

The extra pin would work the same way an Intep ODP (not ODPR) CPU works; it would require a 486 Overdrive/Socket-1 socket on the motherboard.

Also those WinStone benchmarks against the Pentium 75 🤣 WTF, 44 vs 41 but the bar is 10 times as long. 😵 🤣

More sockets:

Have you actually checked the AMD box, it says Overdrive socket NOT needed, so it does not have the extra pin, it works like an Intel ODPR..

Whatever the source of incompatibility is, it's not the extra pin.

appiah4 wrote:

Have you actually checked the AMD box, it says Overdrive socket NOT needed, so it does not have the extra pin, it works like an Intel ODPR..

Whatever the source of incompatibility is, it's not the extra pin.

That’s what I want to know. Just about all the 486 CPU sockets have a hole for the extra pin.
if the is no other CPU on the motherboard does this pin even do anything ?
If not, Then an Overdrive CPU with the extra pin should work on any motherboard CPU socket
With 5v.
Will these work on a 3v CPU socket too ?

Intel486dx33 wrote:

That’s what I want to know. Just about all the 486 CPU sockets have a hole for the extra pin. if the is no other CPU on the moth […]
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appiah4 wrote:

Have you actually checked the AMD box, it says Overdrive socket NOT needed, so it does not have the extra pin, it works like an Intel ODPR..

Whatever the source of incompatibility is, it's not the extra pin.

That’s what I want to know. Just about all the 486 CPU sockets have a hole for the extra pin.
if the is no other CPU on the motherboard does this pin even do anything ?
If not, Then an Overdrive CPU with the extra pin should work on any motherboard CPU socket
With 5v.
Will these work on a 3v CPU socket too ?

Regarding that bolded part, no they do not. Socket 486 (also referred to as Socket 0) does not have the extra pin.

There are many motherboards that have Socket 0 and no Socket 1 for an Overdrive CPU.

I would suppose the extra pin is meant to make sure the CPU is inserted correctly.
Pin D4 is listed as 'Key' in the official datasheet.

Doornkaat wrote:

I would suppose the extra pin is meant to make sure the CPU is inserted correctly.
Pin D4 is listed as 'Key' in the official datasheet.

Yeah it's not electrically relevant, yeah it's a key pin.

Okay, So the extra pin has not other purpose than alignment ?
I thought in the Overdrive socket it disabled the onboard CPU ?

Intel486dx33 wrote:

Okay, So the extra pin has not other purpose than alignment ?
I thought in the Overdrive socket it disabled the onboard CPU ?

Installing an ODP Overdrive CPU certainly disables the other CPU but I'm fairly sure it's not the Key pin detection that does this, as you can install a normal CPU without the Overdrive pin and it will still work in that socket. The board certainly detects the presence of a CPU in that socket, however.

Here are the benchmarks for the Intel 486dx4-100 CPU.

AMD incompatible systems.
Looks like they don’t want these AMD CPU’s in OEM computers.

Two ideas:
Many of those are proprietary form factors. Maybe the CPU would not physically fitin the case because of the large heatsink or it would collide with long expansion cards?
Or is it possible that those boards simply would not support AMD CPUs? I've had motherboards that would not run an AM486DX2 with i486DX2 settings.

Doornkaat wrote:

Two ideas:
Many of those are proprietary form factors. Maybe the CPU would not physically fitin the case because of the large heatsink or it would collide with long expansion cards?
Or is it possible that those boards simply would not support AMD CPUs? I've had motherboards that would not run an AM486DX2 with i486DX2 settings.

Well, Physically it will fit. The AMD has a lower profile heatsink than the Intel Overdrive CPU. And the motherboard CPU socket has a extra hole for the extra pin.
So physically it will fit. Clearance is not an issue either.

Whether or not it will work remains to be seen by me. But another Vogons user has already tested this AMD 5x86 overdrive CPU in his IBM PS/1 and he said it worked but only at 100mhz. but I think he had his bus set to only 25mhz the default. There is a jumper to switch it to 33mhz which is what I am using now.