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Defective AthlonXP 2400+?

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February 26, 2004 2:49:46 AM

I recently upgraded to an AthlonXP 2400+ (Thoroughbred) from an AthlonXP 1700+ (also Thoroughbred). The 1700+ was usually about 42 degrees C at full load, but the XP2400+ runs at about 58 degrees C at full load. I know that the motherboard supports the XP2400+, and the heatsink (Speeze FalconRock) does, too. I made sure to clean the heatsink and processor carefully before installation, and I carefully applied Arctic Silver Ceramique thermal compound according to the directions on the web site as I have many times before. I also re-seated the heatsink and re-applied the compound several times, and it didn't help. I know that the heatsink wasn't on backwards. I'm pretty sure that the problem is the processor becuase the bottom of the heatsink gets extremely hot (indicating good heat transfer to the heatsink), but the heatsink (same model) in another computer I have with an AthlonXP 2000+ (Thoroughbred) doesn't get hot, and that processor runs between 37 and 39 degrees C at full load depending on the room temperature.

I also tried the 2400+ on a different model of motherboard with a different model of heatsink, and it got extremely hot there, too.

Is my 2400+ chip defective? Thanks in advance for your help!
February 26, 2004 3:12:02 AM

The faster a chip runs, the more heat it produces. The temperature is measured through the ondie sensor, and by software interpolation. All that to say that your temps may be just fine. The only true test is if the system crashes because of it. Try running something like Sandra's burn-in or prime95 to stress the chip, and see if it crashes. You may want to run mbm5 in log mode to see how high the "temps" get.
February 26, 2004 3:24:33 AM

Thanks for your fast reply!

I realize that the 2400+ should make more heat as it's running faster. However, it doesn't make sense to me that it's 16 degrees C hotter when the speed difference over my 2000+ is only about 300MHz. After all, the 2000+ is 200MHz faster than the 1700+, and, when used in the same motherboard, their temperatures are very similar.

I can tell that the 2400+ really is running a lot hotter by touching the base of the heatsink. The heatsinks of the 1700+ and the 2000+ are very cool to the touch, but the heatsink of the 2400+ (same model, same thermal compound) is extremely hot. The reported temperature in the BIOS reflects this as well.
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February 26, 2004 3:59:13 AM

Every CPU is diffrent I have seen now a few post about people freaking out about Temps. All I have to say is as long as you aren't Crashing from it your fine don't worry. Alot goes into making a Processor these days and every single one is diffrent with diffrent steppings and the like. I have seen a 2000+ running at 65c while my 2400+ Oced to 2800+ is only like 40c. Why do you ask? Well if I where to guess its because my cpu is and was more aged then his was when he bought it. So my cpu has a better stepping. Normaly (but not always) better steppings mean lower temps. Could be that your 1800+ and your 2000+ have good steppings while your 2400+ has a crappy stepping. With that all said you shouldn't worry I have seen XP take 65c+ and still work with out a glitch. I cant remember what the threshhold of the T-bred (think thats the name?) but I do know that the Bartons (think thats the spelling?) are cooler then the T-breds. What is your 2400 a T-bred or Barton? Also when did you buy your 2400+ and where. Time means everything to a CPU not really how long its been used but when it was made. Right now I would like to get my hands on a 2500+ Barton made in 2003 and not 2004 because now all XP's made after 2003 (Don't know the exact date) are locked. See time is everything to a CPU some times its good to get an older CPU some times its better to get a Newer CPU :0

OK now Im babbling I hope you got what Im talking about :) 

-------------------------------------------------
Remember what your fighting for, Remember why you even started fighting, and Remember who you are
February 26, 2004 4:09:39 AM

Thanks for your reply! Here's the info on my CPU:

AthlonXP 2400+ Thoroughbred (T-Bred)
266MHz bus
OEM processor (i.e. sold without heatsink)
1.65 volts

I bought the 2400+ at NewEgg.com last week, so it's very new. I also bought the 2000+ at NewEgg 3 or 4 months ago.

Here is some information off of the top the the 2400+. I hope I copied it correctly:

AXDA2400KV3C
AIXIB0346SPHW

Does that information give the stepping of the processor? I've heard of stepping before, but I don't exactly understand what it is.
February 26, 2004 9:19:11 AM

There is a third line that you did'nt copy, required for full identification.

<A HREF="http://mp3.zonebg.com/cpu/cpu.php#" target="_new"> Go here </A> if you want to find out everything there is to know about your CPU. User-friendly script.

<A HREF="http://www.xbitlabs.com/news/cpu/display/20030322034857..." target="_new"> Another usefull link </A>

A long long time ago, but I can still remember, how that music used to make me smile... <A HREF="http://www.nexus.hu/zonix/DIGGER.MID" target="_new"><b><font color=blue>Digger rulz</font color=blue></b></A>
February 26, 2004 1:18:28 PM

OK, here's the third line: Z369364190238.

Sorry I missed that the first time.
February 26, 2004 1:27:14 PM

I think that you also missed a D in AXDA2400KV3C. I think it should be AXDA2400<b>D</b>KV3C. if it is:

Core Thoroughbred-B
CPU Model 8
Manufacturing Process 130 nm
Approximate Transistor Count 37.6 million
Approximate Die Size 84 sq. mm
Performance Rating 2400+
Working frequency 2000 MHz
Package Type OPGA
Operating Voltage 1.65 V
Max Die Temperature 85° C
L1 Cache Size 128 KB
L2 Cache Size 256 KB
Multiplier 15x
FSB Frequency 266 MHz
Stepping Code AIXIB
Manufacture Year 2003
Manufacture Week 46
Production Batch H
Batch Production Number 0238


A long long time ago, but I can still remember, how that music used to make me smile... <A HREF="http://www.nexus.hu/zonix/DIGGER.MID" target="_new"><b><font color=blue>Digger rulz</font color=blue></b></A>
February 26, 2004 3:01:03 PM

the 1700 has a max wattage of 51w and there are two types of 2400,one with a max waatage of 65.3w and another 68.3w,assuming you've the hotter one your heat increase of X 1.38 is about equal to the expected X 1.3392156.
February 26, 2004 3:07:58 PM

That's interesting; thanks for your reply.

I've decided that I'll try buying another XP2400+ (which will be fine as I do need another AthlonXP with a 266MHz bus for another computer) and see what happens with it.

Thank you all for your help! :) 
February 26, 2004 5:04:08 PM

The Falconrock is not considered an overclockers heatsink at least not in stock trim.

IIRC the Falconrock has a thermal efficiency of ~0.55 deg C/Watt. The normal thermal dissipation of XP2400+ (Thoroughbred) is 62 watts. This means that you can expect a CPU temp of 62 x 0.55, or 34.1 deg C above ambient case temperature at full CPU load. (Try Toast for fully loading an Athlon).

For example, if your case temp is 28 degrees then a reasonable expectation for maximum temperature for your CPU is 28 + 34 = 62 deg C. Expect a couple of degrees lower for Prime 95. 4 or 5 degrees lower for Seti@home.

In contrast, your Tbred XP1700+ ran at a stock speed of 1467 Mhz and power dissipation was only 45 watts. Max temp should have been about (assuming same case temp) 28 + 45 * 0.55 = 52 deg C.

That's about 10 degrees lower than an XP2400+. (I'm not sure why you would get a 16 degree difference).

<b>56K, slow and steady does not win the race on internet!</b>
February 26, 2004 8:02:13 PM

make sure the vcore in the bios is at the right setting...

If it isn't a P6 then it isn't a processor
110% BX fanboy
February 26, 2004 11:06:10 PM

Yes, the VCore is 1.65 volts, which is correct for this processor.
!