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Topic Title: K6-2 upgrade: My 550 is running at 350...
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Created On: 04/11/2004 06:54 AM
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 04/11/2004 06:54 AM
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Joined: 04/11/2004

I've got an older Compaq Presario 5155 that I've managed to upgrade with more
RAM, larger HD, ATI 7000, etc. It's running XP SP1 but it's sort of slow.
It currently has an AMD K6-2 (3D) running at 350 mhz.
So, referencing this page:' ">
I decided to pickup a K6-2 in the 500 mhz range. I bought a cpu
off of ebay that was pulled from a Presario 7470.

So, I pull apart the 5155 and drop the new CPU in. Hook up the
monitor and keyboard and pray. Luckily, it starts up and all
is well... Or, so I thought. Upon looking at the System
Propertes, it is still registering as an AMD K6-2 (3D) running
at 350 mhz. Using FreshDiagnose, it seems that the CPU is indeed a 550
but currently running at 350.

What do I need to do to get this thing running at 550 mhz? I'm sort of new at
motherboard tweaking so bear with me on this one. Is there a BF2 jumper that has to be set to allow for higher multipliers on this chip? Also, the cpu came with a nice heatsink and fan but I can't find a place to plug in the fan on the motherboard. Any suggestions?


 04/11/2004 12:04 PM
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Joined: 02/14/2004


Most older super socket 7 boards don't offer the handy feature of more modern boards, like "soft fsb" options in the bios. This means that you have manually use some jumper switches on the actual motherboard, to alter both the FSB (fron-side-bus) and multipier speeds.

OK, so we know that your FSB speed is OK, since both the 500MHz and 350MHz model will use a 100MHz setting. All you need to do now is ensure two things:

1) That your BIOS is the most up-to-date version. Check this before you alter any switches and always note down what worked previously.

2) Try and use a downloadable manual or failing that, look on the board for a row of jumpers to alter the FSB and multiplier; sometimes thise row is labelled but you'll need a torch to read it, and usually it consists of a 8 or 10 switches or jumpers (bits of blue, red or white plastic sitting between 2 pins, in a row).

3) Your max. power consumption will rise from around 19 watts to 29 watts. If your board is designed to take a 500MHz model there'll be little risk, and your PSU should be able to accomodate the xtra load.

As for that new fan, this is common problem. It sounds like the older fan is drawing power from the power supply, using the same connector as your hard drive or CD-ROM. The new one is a smaller one used for more-modern boards with better CPU monitoring, and again I'd check to see on the board if there is a 3-pin connector labelled "CPUFan" - it could be located not directly near the actual CPU.

Failing that, you can buy an adaptor which just converts your fan connector to the older type, and and hence just plugs into your PSU like before. However if you're hand with a soldering iron and you know what wirse to connect, you could always patch it yourself since you're not actually chaning any voltages. The only downside to this method is that there is usually a third wire used to measure the fan speed - you'll loose that feature but if you have an older setup anyway you may not have that facility on your motherboard. It depends on the chipset.

Hope this helps.

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. Belarc Advisor:
. GPU Comparison for Laptops: <a href="http://www.notebookche
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