First post, by squareguy
Well I like messing with various CPU's, kind of a hobby in and of itself. Anyways would like to hear some feedback on this idea.
I crunched some numbers and here is what I came up with. I do not have this CPU in my possession yet, just thinking out loud but it seems interesting to me.
Intel Pentium III 533EB, 4x133, 256k Cache, 1.65V, 14W TDP. Undesirable CPU that is cheap on ebay,
OEM high quality BX boards are cheap or free and still 'findable' locally, here at least. Gateway, Dell, etc. Stable but no real features. Do not 'need' features since 533EB is locked. These boards will not post with a 133FSB CPU installed. I doubt it has anything to do with CPU ID and simply a matter of the presence of BSEL1. BSEL0 defines 66/100FSB and BSEL0 in combination with BSEL1 defines 100/133FSB, for lack of better words.
Modify 533EB PCB by replacing 4 resistors with 4 shunts. That will set 66FSB and should allow it to function @ 266 (4x66) on any board including finicky OEM boards. This is easy enough.
OK, so why?
Running @ 266 the 533EB roughly will have a TDP of 7-Watts. Can you say completely silent passively cooled?
OK, so what?
Well, it just so happens that 266-MHz is a magic number of sorts. I'll explain.
Using Throttle http://www.oldskool.org/pc/throttle/DOS/ which I have had a lot of luck with on BX boards we get hardware speed reductions ranging from none to 87.5% in 12.5% increments. OK, so look at how these numbers lineup.
Percentages of full speed, rounded off to nearest whole number +-1 for ease of comparison.
So, do you think this is worth pursuing?
I will probably grab a 533EB soon.
Gateway 2000 Case and 200-Watt PSU
Intel SE440BX-2 Motherboard
Intel Pentium III 450 CPU
Micron 384MB SDRAM (3x128)
Compaq Voodoo3 3500 TV Graphics Card
Turtle Beach Santa Cruz Sound Card
Western Digital 7200-RPM, 8MB-Cache, 160GB Hard Drive
Windows 98 SE