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Athlon XP 2600+ mobile overclocking results

There's been a lot of reporting going on about the Mobile Athlon XP's the past couple of months. Everybody showing their results seem to be using some rather expensive cooling. Today I'd like to take a little more of look at the "value" of these processors. I refuse to use loud fans in any of my systems. I have started taking measures to reduce as much noise as possible from my systems. That is why I decided to use a mobile processor!

Some other reasons to make this worth the added cost is the unlocked multiplier! I had to buy it for RAM testing.

Do you need any more value than reaching 2.3-2.5Ghz?
I'm going to say YES! Having to use expensive cooling takes a lot away from the value. Today I'm using the retail heatsink that came with my retail Athlon XP 2500+. This represents a "free" cooler. Something that was sitting on the shelf never to be used again! It takes 1.825v to stabilize my desktop 2500+ at 2.2Ghz which is far more heat than the retail heatsink can handle.

As of the April CPU Price Guide there was only a $17 difference between the normal Athlon XP 2600+ and the mobile 2600+. I spent $30 on a cooler for my 2500. Being able to use a cheap cooler balances the costs out. The chip I purchased is from NewEgg.

Here's some more you might want to check out:
http://www.geekextreme.com/modules.php?name=Content&pa=showpage&pid=38&page=2
http://www.neoseeker.com/Articles/Hardware/Features/XP-M/
http://www.hexus.net/content/reviews/review.php?dXJsX3Jldmlld19JRD03MjI
http://www.techreport.com/reviews/2004q1/athlonxp-m-2500/index.x?pg=1

Before I start getting into the results I will have to tell you that I could have gotten into windows, taken screenshots and tried to tell you I got my system here kind of thing but I am only telling you what is TRULY stable. This means running folding AND being used by me 12 hours a day. I also left it at that speed overnight to bring total error free up time to 24 hours. The folding program keeps the CPU at 100%. If you'd like more info on this project read here.

Also CPU-z reports the wrong CPU voltage on my Epox 8RDA. All temp readings are after being at 100% load for about an hour.

Test System:
400 watt generic power supply
2*512Mb Mushkin PC3200 2-2-2 (BH6)
Ti4200 128Mb
Epox 8RDA
Retail HSF

Notes about heat production:

Overclocked Watts = Default Watts * (Overclocked Mhz \ Default Mhz) * (Overclocked Vcore \ Default Vcore)?

The first thing I wanted to check out was what I could do with the default voltage. Default voltage on these mobile chips are 1.45v

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2.2Ghz crashed after about 20 minutes of use while backing the FSB down just a single Mhz provided the stability I was seeking. It's really not a bad thing to get a 10% overclock at default voltages. Considering this speed keeps the heat production so low this is probably the speed I'll leave it at.

This is the same speed the 3200+ ships at while running at a much lower voltage and costing $80 less. How's that for a cheap retail heatsink? 44C while maintain low noise.

1.575v

The next big speed milestone took 1.575v to achieve with true stability. This being 2.3Ghz

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I'm thinking about using this speed since it still stays rather cool. I'll probably use this when I put a bigger heatsink on and a nice quiet 80mm fan.

1.8v

This is the end of the line for a cheap heatsink. Under 100% load it gets a bit hotter than I'd like to use.

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Conclusion:

Of course I could have gone higher with better cooling, but with how much more heat is produced by increasing the voltages I want to stick with a very cool running chip. Also my whole point behind this article is showing it with "free cooling" since this was a heatsink I never would have used had it not been for this nice and cool running chip.