Hmmm...there was a certain batch of P133 chips that was locked. I remember hearing about it. Can't remember if it was like SY033 or something like that or SY022. I dunno. My P133 runs at a 3.0x multiplier and 66FSB at stock voltage (no voltage tweaking on this baord) without problem...
Intel Pentium 4 2.53B C1 @2.85GHz (stock volts), watercooled @ 27*C load
MSI 865PE Neo2-P (i865PE + ICH5), 1GB PC3200 DDR RAM
ATi Radeon X700Pro 256MB AGP8x
Seagate Barracuda 7200.9 160GB SATA, Maxtor DiamondMax 9 Plus 80GB
NEC DVD-RW (ND-3520A), Lite-On 52/32/52x CD-RW (LTR-52327S)
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Quote from Tom's Hardware Guide
In case you want to overclock a Pentium 133, try to avoid the 'SY022'. 33% of the Pentium 133 with this S-spec have been disabled for multiplier settings of more than x2. In my database there are 22 of 66 entries with the 'SY022', where the CPU wouldn't support multipliers of x2.5 and x3. A small number of SU073 also seem to suffer from the same problem.
If you have an SY022 P133, it is, most likely, locked. I read somewhere else just a few moments ago that said most P133 and P200MMX chips were locked.
Intel Pentium 4 2.53B C1 @2.85GHz (stock volts), watercooled @ 27*C load
MSI 865PE Neo2-P (i865PE + ICH5), 1GB PC3200 DDR RAM
ATi Radeon X700Pro 256MB AGP8x
Seagate Barracuda 7200.9 160GB SATA, Maxtor DiamondMax 9 Plus 80GB
NEC DVD-RW (ND-3520A), Lite-On 52/32/52x CD-RW (LTR-52327S)
Microsoft Windows XP Professional SP2 My Heatware | My Beerology | My eBay rating
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133MHz was the fastest a lot of motherboards supported. You may simply be at the limit of your mobo. MY P100 was like this- 100MHz was the fastest it would go, so wasn't much I could do...
My P233MMX was locked. No higher than 3.5x . Didn't really matter though because 3x83 was the fastest setting I could probably ahve used. 3.5x75 worked for like 261, but 3x83 for 250 was faster. Damn I loved that setup. Started with some POS Packard Bell that I got for $26 at a computer show. Ended up ruining that board somehow...I think I flashed the wrong BIOS, and then ****ed up the bios chip trying to get it out. Then I bought a ASUS SP97-V. Worked awesome...that is, until another corrupted BIOS flash (damn floppies!). For a while, I had no idea what I was gonna do so I bought an ASUS SP97-XV. Basically the SP97-V with USB, and ATX form factor. Then I found this guy named Arthur Keekmeester or something. His site is www.flashbios.org I believe. Can't remember. So for $7USD (plus the $3 it cost to ship overseas back a couple years) I had my chip sent to him and reflashed with a good image, and back to me within a week. He's helped me a couple times with various dead boards I've received from people.
I'm going to be getting rid of my P133 soon I think.. depends if my uncle's P166MMX will work in my board. The Intel board I have doesn't support MMX chips, nor their voltages. So I'm gonna try the chip in the board with good cooling and hope it doesn't fry. I may eventually get around to voltmodding the board down lower as well. If the 166MMX works out for me (need the extra cache for my server), then I will be looking to get rid of the P133 I think...
Intel Pentium 4 2.53B C1 @2.85GHz (stock volts), watercooled @ 27*C load
MSI 865PE Neo2-P (i865PE + ICH5), 1GB PC3200 DDR RAM
ATi Radeon X700Pro 256MB AGP8x
Seagate Barracuda 7200.9 160GB SATA, Maxtor DiamondMax 9 Plus 80GB
NEC DVD-RW (ND-3520A), Lite-On 52/32/52x CD-RW (LTR-52327S)
Microsoft Windows XP Professional SP2 My Heatware | My Beerology | My eBay rating
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