Help me clear a 65W vs 89W issue

velis

Senior member
Jul 28, 2005
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I'm talking about X2 3800+:

See here:
AMD new proc pricing

And here:
Proc comparison

Even these two are a bit confusing as processor comparison pages don't list any socket 939 65W parts while the first one clearly shows that only 65W variant is still available.

So I go ahead and order one 3800+ X2 specifically requesting a 65W part. The rep assures me I got the 65W part, but there are no indications of this fact on the box. Also the processor tends to get rather hot (25°C idle --> load difference), so I really think I got a standard 89W part.

The processor I got is a Manchester core:
ADA3800DAA5BV
LDBFE 0622WPMW

Using two instances of Prime95, maximum heat stress test it goes from 43°C idle to 68 - 69°C @2.5GHz, which is IMHO way too much. Prime is stable though. Voltage is 1.4 of course. Using AS5 and Zalman CNPS7000AlCu to cool it.

I know AS5 is not settled in yet, but arctic cooling instructions mention 2-5°c temp drop only so I'm not expecting much from that.

So, can anyone straighten the facts for me? I'd like to be SURE of what type of processor I got and also if this temp difference (>25°C) is normal. I may have made a mistake while cleaning and settling the HS to the CPU (it was my first time after all) so let me know if it might be that.
 

myocardia

Diamond Member
Jun 21, 2003
9,291
30
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First of all, that isn't a very good heatsink for two A64's. And secondly, you've messed up installing it. There should never be more than a ~10°C difference between idle and load temps. Do you have case fans? If not, see how hot it runs with the side panel off.

edit: For instance, my 130nm Skt. 754 3700 ran exactly 10°C cooler than that at 2.7 Ghz, with a 1.70 vcore, with a TT Silent Boost heatsink, running Prime 95. Well, SP2004, at a priority of 9.
 

velis

Senior member
Jul 28, 2005
600
14
81
Thanks for the info.
So now I'm sure I got ******.

Will see what I can do to fix this :(

myocardia: Yes, I thought so though my old 3000+ Winchester also got from 34 to 56 and it was mounted by an expert ;)
 

velis

Senior member
Jul 28, 2005
600
14
81
Oh, and what about the discrepancy between the two AMD documents? The new processor pricing states that there is 65W 939 proc available while processor spec comparison page lists no such processor.
Does anyone know whether that's a documentation glitch or just that those processors are currently simply not available? If the latter, when will they be?
 

myocardia

Diamond Member
Jun 21, 2003
9,291
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Originally posted by: velis
myocardia: Yes, I thought so though my old 3000+ Winchester also got from 34 to 56 and it was mounted by an expert ;)

You know those aren't meant to be used fanless, don't you? Or, your temp sensor may just be off WAY more than they usually are. Or are you one of those people that doesn't use case fans?

edit: post your "numbers" from your cpu, and I'll/we'll tell you which part it is
 

Furen

Golden Member
Oct 21, 2004
1,567
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I dont think AMD released a 65W 939 part. If you undervolt it you should be able to get much lower than that, though.
 

velis

Senior member
Jul 28, 2005
600
14
81
OK, I dismounted the HS and did it 100% according to ArcticCooling instructions. I used a credit card to spread the paste across the CPU. I made sure it's as thin as possible. Then I mounted the HS back.

Results: 1.3825V @2500 MHz dual prime stable (for 3 hrs now) and the temps don't exceed 63°C. System temp reported goes as high as 44°C. There's no temp reported that would go lower than that.

According to my HS data (0.22 °C / W) this is OK (90W * 0.22 = +20°C --> 44 + 20 = 64°C). The only gripe I have against it atm is the fact that is blows the air all over the place increasing internal case temps needlesly.
Maybe I should look into CNPS9500. It's thermal resistance of 0.12°C / W promises temps below 55°C at all times. It should also improve overall temps since it can be directed towards the exhaust opening. That should improve case airflow greatly IMHO.

@myocardia: Complete setup:
Antec Sonata I
Antec TruePower II 380W (2 fans)
12cm Papst exhaust
Zalman CNPS 7000 AlCu + fan (MB controlled)
Replaced NB HS + fan (ASUS replacement) - ASUS A8N-SLI DeLuxe
Antec 12cm intake (originally exhaust) - MB controlled
Gigabyte GeForce 6600GT passive
3 HDs, all 7.200 rpm