I’m at work so I can’t download your manual. Usually when you encounter a spot on the MOBO where a jumper used to exist, the board has been revised so that function is no longer needed or is a function that can be taken care of elsewhere (like in the BIOS settings). If you cannot find a way to set this in BIOS, Chaintech may have a BIOS upgrade that will automatically do this for you.

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I had a chaintech MOBO and it had a multipliyer in the BIOS under "Advanced Chipset Features" . I recently bought an AMD 1900+ and had the same problem as you. I entered my Bios and entered 133Mhz FSB and a multiplyer of 12x to achieve 1.6 Ghz (133x12=1600). so basically your CPU is underclocked is all.

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Hey Damon D: 1600MHz IS the correct frequency for an Athlon XP 1900+. Your CPU is not “underclocked” if you are running it at 1600MHz.

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7AJA2E doesn`t support 133(266fsb) mhz frequency. That is why you don`t have jumper. If you want to keep Athlon you have to change the motherboard, try 7aja2 (without E)http://www.chaintech.com.tw/Products/socketa/7aja2e.htm

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I just ordered the 7AJA2E from Compgeeks.com for $33.50. I have yet to receive it but from what I've read, it doesn't support the 266 (133FSB). The latest BIOS available from Chaintech (dated 2001/12/5) adds AMD Athlon XP 2000+ support. The previous BIOS update (dated 2001/9/12) adds support for AMD XP CPU's...so possibly a BIOS update is in order. Does this latest BIOS support the 266 (133FSB)? I don't know. Does anyone out there have the answer?

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Here's a little something I found at Viahardware.com while searching for info on the KT133E chipset: VIA themselves summed it up best: "KT133E is the KT133A, but not certified for 133MHz bus operation". What does that mean..."not certified"? Does that mean that it will run the 133FSB but it's not officially supported?

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Here's some more info on the KT133E chipset that I found at Overclockers Online: So what exactly IS the VIA KT133E chipset? Well, the KT133E can be compared to the famous KT133A chipset but without official 133MHz FSB support. You'll find out later in this review that the FSB on our Abit KT7E even went up a 'little' higher than 133MHz, so I'm thinking ... Man, what's all this "no official 133MHz FSB support" crap?? And so the review continues... Although the specs tells you that the KT7E only supports 100MHz FSB speeds (200MHz DDR), I was able to run a 133MHZ FSB (266MHz DDR) with ease! I even dared to push the KT133E on this mobo even further and the pushing only stopped when I reached a 146MHz FSB! I could POST using a 147MHz but I experienced crashes during the Win2k startup. That's when I realised that the KT7E and/or the KT133E chipset had reached their limit. But by using a 146MHz FSB, I was able to run my Duron 850 @ a rockstable 1095MHz (7.5 x 146MHz). I know this review is on an ABIT board & not the Chaintech, but I would think the info on the KT133E chipset would hold true...provided that the FSB can be changed thru the BIOS. Once again...does anyone know if this is possible with the Chaintech board?

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I`ve tried new bios on 7AJA2E without success. KT133 chipset doesn`t support 133MHz. In 7aja2e bios last frequency is 130MHz. I even tried to cut wire on 133/100 MHz "jumper", there is no jumper only wire connecting pin 1-2 (100MHz) and solder it on 133Mhz (pin 2-3) and again nothing. Jam can you explain how they manage to break 130 MHz barrier on Abit board.

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I just bought the same chaintech board. I have yet to find a setting for 133 in any of the above mentioned locations. I've resided myself to 100 MHz x 10. At least I would if I could get the machine to load a BIOS. I've got all new hardware and the only things that I have not ruled out is the Chaintech board and the CPU. Locks up when asking for the license code. I have an email into support. I've talked to all of my tech friends that I work with and no dice yet. I'm starting to think that it's a piece of junk. I've turned everthing off in the BIOS. Swapped every part I could. Had no PCI cards installed.

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hey jam, i'm having problems with my CPU. it's underclocked by a 100mhz. i'm using an EPOX 8KTA with a VIA KT133(?) chip ( if i'm not mistaken ). does this VIA chip have problems? is it faulty?

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I have the same board. There seem to be two boards: 7AJA2 based on the KT133 and 7AJA2E based on KT133E. On the 7AJA2 , the FSB is not selected in the BIOS, there is a jumper labeled JP9 in the upper right corner near the RAM slots. It is used to select the FSB speed. On the 7AJA2E, there is no jumper, the pins corresponding to 100MHz are hard wired together. The only way I could see to change it would be to unsolder the connection between the pins and resolder a connection on the 133 MHz side. Or, solder jumper pins onto the board in place of the wire like the 7AJA2. Since the KT133E chip doesn't officially support a 133MHz FSB, It may or may not work. Since I use this board on a second PC, I don't really mind having an Athlon XP 2000+ running at 1250 instead of 1666. If it were my primary PC, I would probably ditch the 7AJA2E and get a 7AJA2. For another workaround, you can try clocking it up in the BIOS. There is an option in the BIOS for Frequency/Voltage. It allows you yo change the Host Clock and PCI Bus speed. I cranked it up to 130/33 just to see what would happen, and the system would not POST. If that happens, clear the CMOS and it "should" correct the problem.

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