An Intel and AMD CPU in the same motherboard at the same time?

This is the FIC 4386-VC-HD - a 386/486 hybrid motherboard released back in 1992. It has a multi-tiered PGA socket that can be used for a 486 CPU or a math co-processor. Because it has a soldered on AMD 386 DX/40 CPU, it is one of the few boards out there that allows you to have both an Intel and AMD CPU installed simultaneously. Obviously the 386 CPU will be disabled when a 486 CPU is installed, but it is still an interesting sight to behold! There was a lot more flexibility in this era of PC hardware than we see today.

[madmax]

I did have am old Compaq Prolina 3/25zs that had an Intel 386 25Mhz, that had a snap on Cyrix 486 CPU upgrade.

[Blank_Redge]

Had one of those, but it was a Vega board with a Symphony chipset...those were the days.

[GGigabiteM]

There were very uncommon high end servers in the late 80s/early 90s that had an AMP architecture (asymmetric multiprocessing.) I think it was Compaq that had a server with a main CPU that was a 486 and an I/O processor that was a 386. So technically you could have both an AMD and Intel CPU in the same machine working at the same time.

Some high end disk controllers and video cards used 808x processors, so the same could be said for those as well.

[Spyd]

Also it has VIA chipset, that later bought Cyrix, so 3 competing brands. And if the cache modules were Texas Instruments, it would have been 4 competing brands in the same motherboard.

[donixion]

I had one and it was one of the best systems I ever built.

[clintthompson]

Sweet Board. I got myself a fx3000 motherboard that right now has a 386 installed AMD DX 40 and has the socket also above it that can install a mathco processor but my board I have to desolder the 132 pin socket and then solder on the 168 pin 486 socket in its place so that I can use a 486 CPU. I bought a IT'S ST(Cyrix) 486 DX-2 80MHZ(5Volt) for that board but still have to buy the 168 pin socket to replace the original 132 but I also just got a Cyrix GP-40 in the 386 132 form factor that was shipped from Ukraine that I want to over clock to 50Mhz by changing out the Crystal oscillator on the board from 80 MHz to 100 MHz. So I'm at a crossroad of which one I want to do more. I also purchased 4 different models of the AMD 5x86 133Mhz CPU. I would love to be able to find the AMD DX2-80 that you have in the 5 volt version. In your 486 build I believe it was part 2 you had mentioned there is no such thing as a perfect 486 build I can tell you at the same time I understand that feeling and I also put myself into that now that I bought so many different parts I accidentally made my own dilemma. Great video and have a good one.

[Meton]

You can build a pretty killer 386 on that since it already has the fastest 386 on it ready. Just install a fast math co-pro and batang.

[wernerviehhauser]

Reminds me of my AMD 386/40 that got married to an Intel 387/33(now 40) I found in the trash 20 years ago.

[TheKeymaster]

For that 486 processor, could you use an AMD or Intel processor in that slot? I am new to the 486 and recently bought a new old-stock motherboard and currently have an Intel 80486DX-33 in the board. I purchased an AMD 80486DX4-100 this week and I can't get it to boot with this processor. The motherboard is a Biostar MB-1433 and, according to the documentation and what I've found elsewhere, the AMD requires 3.3v, so I removed the jumpers on the board to allow this, but the computer won't post. So I wasn't sure if AMD processors were supported or not on this board. According to the data sheet, it just says it supports up to an 80486DX4-100, but no where does it specify on the documentation about Intel or AMD. Thank you.

[YarisTex]

Would be interesting to modify the board to select which CPU you want to boot with a switch

[LMB]

387… something I've heard of, but have never seen. CAD required it - or a 386DX, of course.

[teknologyguy]

Did you ever make a longer video showing the details of this board after you installed the DX2?

[raspberrykb]

ngl i think it'd install a cyrix fasmath in there