nwsw wrote on 2020-06-18, 06:16:
I have an Abit BX-20 Slot 1 motherboard and I currently have a PII 300 mhz that shows properly. I just got a PII 400 mhz […]
I have an Abit BX-20 Slot 1 motherboard and I currently have a PII 300 mhz that shows properly. I just got a PII 400 mhz, but when I plug it in, it shows as a PII 266 in the BIOS and in Windows. Anyone have any ideas? I don't see any disabled caches or anything in the BIOS that would affect it. I have the latest BIOS if that helps.
The CPU model is: 80523PY400512 SL2S7
If only just for future reference, this is mostly a matter of RTM.
Read about the parts you intend to use as if you don't you could damage your components. I mean the wikipage on Pentium 2 has all the information you were missing:
The original Klamath Pentium II microprocessor (Intel product code 80522) ran at 233, 266, and 300 MHz and was produced in a 0.35 μm process. The 300 MHz version, however, only became available in quantities later in 1997. These CPUs had a 66 MHz front side bus
The Deschutes core Pentium II (80523), which debuted at 333 MHz in January 1998, was produced with a 0.25 μm process and has a significantly lower power draw. The die size is 113 mm2. The 333 MHz variant was the final Pentium CPU that used the older 66 MHz front side bus; all subsequent Deschutes-core models used a 100 MHz FSB.
I mean the information is right there and available for all to see.
Fair enough, it is not always possible to find a manual for literally every single piece of hardware that is out there, but the 440BX was a widely used motherboard chipset. I mean it was literally everywhere. The wikipage of the 440BX chipset mentions this:
The Intel 440BX is the third Pentium II chipset released by Intel, succeeding the 440FX and 440LX. With the new 100 MHz front side bus, Pentium II CPUs were able to scale better in performance by reducing the difference between processor clock and bus speed. The previous 66 MHz bus
Pentium 2 300MHz is 66MHz FSB while the 400MHz Pentium 2 is 100MHz FSB.
Having set the motherboard to 66MHz FSB while trying to install a 100MHz FSB CPU in there will cut 33% of the CPU speed off of it, resulting in 400 * 0.66 == 266.
Same thing with your other thread where you tried out a Tualatin CPU in a Coppermine board and had no idea why it was not working. Just RTM I would think. Not knowing that a 500MHz Mendocino cannot overclock to 750MHz while a 600MHz Celeron probably can is not something that is mentioned a lot but is also kinda basic. I mean a 50% overclock to a CPU was never a common thing but you seemed like you were surprised about it.
Which makes me curious about one thing. Why are you wanting to build a retro rig anyway? I'm just curious, because you seem to have very little experience with building computers and seem to have virtually no knowledge of the hardware of this era. Sorry for being off topic here but I am really very curious now.
One thing to remember of the hardware of that era (and this is somewhat more generic advice) is that Pentium 2 is around the time that its motherboards were transitioning from setting most by physical jumpers (and sometimes the tiny DIP switches (which in German are sometimes talked about as a piano for mice 🤣)) to setting it by software.
Really, I am so curious how you got started with this hobby in the first place 🤣 😜