Thank you. Ok, this slotket was produced by Soyo and marketed by Soyo and PCchips. The production date is somewhere around june/july 1999. Pentium 3 cpu's with fsb 133 were launched in october of the same year and my suspicion is that these slotkets were not, or not under all circumstances, capable of running cpu's with fsb 133. In my data collection I came across a review that included the predecessing 1.3 revision of this slotket and that one was not able to run reliable at even fsb 100. Before you start digging a rabbithole around a possible flaw in your motherboard or other components I would advise to try a later slotket (and from another brand) than this one.

That specific one is OEM'd by Fastfame. They're the only ones to have that specific QC OK sticker.

PcBytes wrote on 2024-10-26, 18:09:

That specific one is OEM'd by Fastfame. They're the only ones to have that specific QC OK sticker.

Interesting.... you must be another slotket sleuth 😀. I never looked into this aspect but there are several examples of what are supposed to be PCchips products with the same type of QC OK sticker (in green and blue) plus also a couple that were supposedly marketed by ECS. So I am not sure if this is a sound way to find provenance.

Green stickers indicated Fastfame. I have had three of their mobos with that green QC OK sticker.

I'll keep it in mind.

PARKE wrote on 2024-10-26, 17:01:

Thank you. Ok, this slotket was produced by Soyo and marketed by Soyo and PCchips. The production date is somewhere around june/july 1999. Pentium 3 cpu's with fsb 133 were launched in october of the same year and my suspicion is that these slotkets were not, or not under all circumstances, capable of running cpu's with fsb 133. In my data collection I came across a review that included the predecessing 1.3 revision of this slotket and that one was not able to run reliable at even fsb 100. Before you start digging a rabbithole around a possible flaw in your motherboard or other components I would advise to try a later slotket (and from another brand) than this one.

I didn't think that the slotket could be the reason, but now I wonder if there really is something wrong with it. When I put 133 FSB CPU the messages are strange. 1B. Sometimes it's not there at all. Once when overclocking I saw 6.12 GHz (xD).
However, when I insert 1100/100 cpu, it is detected correctly as 1100MHz. The same when changing FSB to 112, even though the CPU is unstable, the correct frequency is also shown.
Next I will check it on cpu slot with 133FSB, without slotket. When I get it, of course.

In case you are interested in variables in slotket function attached the review I mentioned. There are a couple of slotkets with fsb recognition problems mentioned. It is translated from dutch and I added a couple of comments in red. The Soyo rev. 1.3 is at the end. (the original can be found here: https://archive.org/details/eu_Ct_1999-09_OCR … e/n137/mode/2up)

Success!
I just managed to buy slot 866/133 for $9. The system works on fsb133 and is stable in prime95. Besides, it works on sdram marked 133/C3 😀