Thank you for the reply, I didnt pay attention the speed of the chips on the board, but that makes sense. It seems finding the 45ns 20dip chips is harder than I thought. It seems like these should work based on the specs given https://www.utsource.net/itm/p/213590.html

I have a newly acquired dell 433/MX and I am thinking about adding some additional video memory. Currently on board is a Tseng ET4000/W32i with 512kb of memory. The board has 4 EA, 20 Pin Vmem slots for upgrades that are currently empty. I have looked around and found a few possible chips that seem …

Update on the issue. I did what I should have done and started to remove some the ISA expansion cards. After removing both the network card and Trident video card, I was able to use the integrated graphics and it booted to the DX2-66. Why this worked, I am not sure though. Unfortunately when I close …

Would there be a jumper to set the board to 33mhz?

So it will boot only when I remove the jumper on the 33mhz option, no jumpers on the board. Bios then says its a 486DX2-40 even though its stamped on the chip 80486DX2-66. Nope, no 486 in there. I had a Intel 80486DX-33 originally and then installed a Intel 80486DX2-66 in its place. The only jumper …

I have an older Dell 433/MX I recently have acquired. Overall works well, no major issues considering its age. It came with a 33mhz/dx processor and I am working on upgrading it to a 66mhz/dx2. I installed the new CPU and it would not boot, so I took the 33mhz jumper out and then it booted but only …