Very nice! A dual Pentium with 430NX is a rare sight - most had the newer 430HX. Does anyone now what this NEC chip is for (SMARTOEN or something)?

It actually says SmartGen.
Also, these are MMX Pentiums it seems. Im having some System problems, some one installed windows 98 on this.

The picture shows an SY022 - I have one of those and I'm sure it's a socket-7 Pentium 133 (non-mmx). I don't know anything about socket 5 so I'm not sure how it's plugged into that socket. I may just be confused all the way around I guess. 😀

I don't know anything about socket 5 so I'm not sure how it's plugged into that socket.

First of all, Socket 7 came along with the Pentium MMX. The older non-MMX chips are Socket 5, and those definitely are the older non-MMX chips.

But that doesn't really matter so much... in practical terms there's not much difference between sockets 5 and 7. They are electrically similar except for the dual voltage support on S7. They are also physically the same except for an additional pin on socket 7, which only serves as a mechanical guide pin. And that extra pin isn't actually used on any of the Pentium chips anyhow, not even the Socket 7 ones... the Pentium and Pentium MMX chips both only use 296 of the 320/321 pins.

You can use a S5 chip in an S7 board, and in many cases S7 chips will work in a S5 board (provided the voltage issue is handled, and the older board's BIOS doesn't freak out with the unrecognized chip).

Old Thrashbarg wrote:

First of all, Socket 7 came along with the Pentium MMX. The older non-MMX chips are Socket 5, and those definitely are the older non-MMX chips.

Thanks for the explanation.
That's a strange revelation for me - I've gone all this time thinking the P54Cs were socket 7. I had no idea that was really just for the MMX chips.
I need to take a closer look at the sockets on some of my old boards - at least 1 I'm sure doesn't "really" support MMX, I guess it must say Socket 5 and I never noticed.

Ah, what do i know 😀
Thanks for that as well, now i know.

So my only option for MMX is the OverDrive?

If you want to keep the dual processors, the Overdrive chips are probably out, because I don't think they support SMP. So that just leaves the adapter boards with their own onboard VRM (like the Powerleap PL-PROMMX, etc.)... but you're going to have trouble finding some that will physically fit due to the placement of the CPU sockets. You could probably get one in there, but two of them side by side like that is going to be a tight fit at best.

Mmm, nice CD-ROM. I have the same model in an external enclosure (the drive's SCSI, the enclosure parallel), at 8x.

Those multiprocessor boards were not cheap either. AFAIK started around $250 and went up from there.

All in all, what a weird system!

Oh i see, i saw those voltage converters, i will have to do some research.
yeah the CD Rom is nice, but i replaced it with a much newer TEAC model, also scsi 😀

Stojke wrote:

Oh i see, i saw those voltage converters, i will have to do some research.
yeah the CD Rom is nice, but i replaced it with a much newer TEAC model, also scsi 😀

And give that CD-ROM to me 😀

Are you sure you've got what it takes to handle that bad boy? 😏

First of all, Socket 7 came along with the Pentium MMX.

I don't think this is right. The MMX chips came out in October 1996. Socket7 would have come out with the P133 (and 430FX chipset) on or before June 1995. While split rail voltage was part of the specification, it was rarely implemented in 1995 since there were no split rail CPUs at that time to take advantage of it. (not all socket7 motherboards can take MMX chips). The only notable differences of socket7 at the time was that it supported higher current CPUs, and had an extra pin to prevent said CPUs from being plugged into older boards. The transition from socket5 to socket7 was pretty seamless...I don't think anyone even really noticed.

Socket 7 has been defined as the upgrade socket for the Pentium processor 133, 150, 166 and 200 MHz in addition to the Penti […]
Show full quote

Socket 7 has been defined as the upgrade socket for
the Pentium processor 133, 150, 166 and 200 MHz in
addition to the Pentium processor 75, 90, 100, and
120 MHz. The flexibility of the Socket 7 definition
makes it backward compatible with Socket 5 and
should be used for all new Pentium processor-based
system designs. The Socket 7 support requires
minor changes from Socket 5 designs – an additional
key pin, 3.3V clocks, additional supply current, etc.
Contact Intel for further information regarding the
Socket 7 specifications.

Anonymous Coward wrote:

First of all, Socket 7 came along with the Pentium MMX.

I don't think this is right. The MMX chips came out in October 1996. Socket7 would have come out with the P133 (and 430FX chipset) on or before June 1995. While split rail voltage was part of the specification, it was rarely implemented in 1995 since there were no split rail CPUs at that time to take advantage of it. (not all socket7 motherboards can take MMX chips). The only notable differences of socket7 at the time was that it supported higher current CPUs, and had an extra pin to prevent said CPUs from being plugged into older boards. The transition from socket5 to socket7 was pretty seamless...I don't think anyone even really noticed.

Socket 7 has been defined as the upgrade socket for the Pentium processor 133, 150, 166 and 200 MHz in addition to the Penti […]
Show full quote

Socket 7 has been defined as the upgrade socket for
the Pentium processor 133, 150, 166 and 200 MHz in
addition to the Pentium processor 75, 90, 100, and
120 MHz. The flexibility of the Socket 7 definition
makes it backward compatible with Socket 5 and
should be used for all new Pentium processor-based
system designs. The Socket 7 support requires
minor changes from Socket 5 designs – an additional
key pin, 3.3V clocks, additional supply current, etc.
Contact Intel for further information regarding the
Socket 7 specifications.

Is not Pentium MMX released on January 8 1997?

Maybe announced in late 96, available early 1997.

Stojke wrote:

Its a dual Pentium rig, only this one has 2x 133MHz pentiums, not the original 90MHz ones.

Could you please tell me what were/are the DIP switch settings for this?
I've found a XU manual, and also two different general Vectra technical manuals, and I can't get even one 133MHZ CPU to work. Now, if I set it up as 100MHz, it'll show me the error message [ unlike setting it up for 133], but i want to use it .-.