I got one of those JUIHB 1700 xp chips, I've slapped it in my mobo and hit a few problems.
First off the mobo won't recognise the chip and comes up as unknown.
Second, it won't clock. I can set the multiplier up to x15 in bios but it reads at x11 on every boot.
I've got an Epox KHA with the kt266 chipset.
Any ideas how to get this chip going quicker?
It's replaced an 1800 XP which I could ramp up, so I'm befuddled.


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The 12.5x max limitation is common to almost all mobos, they can't manipulate (or understand) the 5th FID bit. Most CPUs with a stock multiplier < 13x don't have a bridge to connect, the CPUs with a (default) multiplier over 12.5x have an extra bridge which translates into a corresponding higher multiplier (eg 5.5x becomes 13x, 7.5x becomes 15x etc). Cutting that extra bridge reverts to the lower multiplier and you should then find most mobos can then adjust it freely between 5.5x and 12.5x. Basically if the default multiplier is below 13x then there isn't a bridge you can join or cut as it's simply not present. This is from memory so I could have it a little wrong.
Deckard KT266 were designed to run 266FSB using the traditional PCI divisor. 1/4 is the highest divisor you're likely to have and this will keep PCI/AGP/IDE all in perfect spec at 266FSB. If you want to go higher 144FSB (288FSB inc DDR) is the highest you should find safe otherwise things will run too far out of spec. It will also need RAM and PCI devices happy to run at the faster speed. As always use small steps up and test throughly for stability each time. I would advise you keep stock 266FSB and up the multiplier gradually to 12.5x (the likely maximum for your mobo) and then take small steps up the FSB (again testing thoroughly). When you find your limit you should work out the limiting factor, so long as it isn't cooling (case or HSF) then you can up the core voltage but I'd suggest 1.65v as a normal maximum for TbredB with 1.70v still being very safe, just expect a LOT more heat. Be sure your HSF is up to it, perhaps consider the Volcano11 for £15. Your RAM will run faster (in mhz) if you use the higher RAM timings, low timings are only 1-2% faster anyway and that's eliminated with faster mhz. Your mobo and RAM are very likely to be the most limiting factors, the CPU should be (roughly) fine up to 2.0ghz at 1.5v-1.55v or 2.2ghz at 1.65v-1.70v.
So take it steady but expect 12.5x144=1.8ghz (XP2200+) to be the best you can expect unless you change your mobo (and probably RAM, esp if it's SDR eg PC133). If you change your mobo you could probably get that CPU to 2.2ghz with little problem and at 400FSB that would roughly be an XP3000+. You could also consider the TMC-XP socket adapater which would allow you to use very high multipliers among other things (eg 16.5x133=2.2ghz), do a search.

