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Finally - accurate TDP for your individual AMD processor

AMD64 TCaseMax - v1.19
----------------------

CPU Information (CPU #1):
Standard CPUID: Family: F, Model: 7, Stepping: 1
Extended CPUID: Family: F, Model: 27, Stepping: 1
CPUID String: 20F71
Processor APIC: 0
Processor: AMD Athlon 64 3700+ (San Diego)
CPU Speed: 3003.13 (286.01 x 10.5)
Revision: SH8-E4
Platform: Socket 939
Startup VCore: 1.400v
Maximum Case Temperature = 59C
TDP: 50.0 Watts
 
does using cpuz help in anyway??

2_133.jpg
 
Kesnel said:
It's written on the chip. :)

Stepping is the second line and the batch number is the last four numbers of the third line.
Click to expand...


Sorry to say then m8 i don't know what it is...and without taking it out which i don't think i will be doing, i can't tell you so i do apologise...

if you want to know if its a good o/c then yeah its not to bad i've had it upto 2.4t1 on stock and 2.6t2 on 1.45v...both stable as well....but i don't really want to o/c it, its fast enough as it is.
 
CPU Information (CPU #1):
Standard CPUID: Family: F, Model: 7, Stepping: 1
Extended CPUID: Family: F, Model: 27, Stepping: 1
CPUID String: 20F71
Processor APIC: 0
Processor: AMD Athlon 64 3700+ (San Diego)
CPU Speed: 2706.35 (246.03 x 11.0)
Revision: SH8-E4
Platform: Socket 939
Startup VCore: 1.400v
Maximum Case Temperature = 55C
TDP: 38.2 Watts
 
Dutch Guy, you seem to understand this better than most can you answer a question :

Teggs has a 35w TDP and mine is a 45w TDP ( both Opty 170)

Am I to understand from that in general for a given speed Teggs would be able to run at a lower voltage ( a major plus point) however mine has potentially a better top speed?

I might have misunderstood the main page of the linked site as well as your posts above but is this the case or not?

At the end of the day I am well happy with mine, just trying to understand a little more.

Cheers
 
Seems fair enough thank you - I have a Freezer pro to replace my stock cooler so that should get my Cast temp a little lower hopefully
 
FrankJH said:
Dutch Guy, you seem to understand this better than most can you answer a question :

Teggs has a 35w TDP and mine is a 45w TDP ( both Opty 170)

Am I to understand from that in general for a given speed Teggs would be able to run at a lower voltage ( a major plus point) however mine has potentially a better top speed?

I might have misunderstood the main page of the linked site as well as your posts above but is this the case or not?

At the end of the day I am well happy with mine, just trying to understand a little more.

Cheers
Click to expand...
Don't take my words for granted, all I do is guess but I think I am right.

This is what I think:
A lower TDP indicates the CPU can work better at low voltage, perhaps AMD tests to see what the lowest voltage is that the CPU can run at to see how little heat it produces
A high TCaseMax might mean that the CPU can still work stable at a high temperature (I don't think the word Case in it has anything to do with the computer case it is installed in)

But obviously it also depends on the chip itseld as I doubt AMD test each one, they most likely take a sample of a batch and not each CPU so there might still be a difference between two CPU's of the same batch.
 
I'm not convinced. For example my "32.4W" 3000+ venice A64 certainly runs extremely cool as the TDP suggests, but it's not the best chip I've seen at undervolting. Some people can run stock speed at 1.1v or less with their chips but at 1.1v with mine the best i can do is about 1.5ghz.

I suspect this TDP is dependant on power leakage / internal resistance of the chip and therefore current draw. From what i can gather these numbers - the TDP and tcasemax represent the thermal resistance (C/W) of the chip. Ie - AMD measure the chip under controlled conditions (stock voltage, ambient temperature of 42deg etc). The tcasemax represents the temperature that the test rig stabilises at under full load (one would assume the temp measured say exhausting from their test rig enclosure). Once you know the temperature increase you can calculate the thermal resistance and TDP of the processor. Of course this could just as eaily be done the other way around with AMD measuring the current draw of the chip and calculating tcasemax and TDP etc from there.

The question seems to be - is there a link between this TDP and overclockability? Processor design, manufacture and semiconuctor behaviour is pretty complex stuff. i won't pretend to understand it. I am not yet convinced though that there is a direct the link between TDP an overclockability. There may or may not be one, but there are certainly other factors involved too.

I'm going to have a hunt through the AMD white papers next week and see if i can find some more info on how it is calculated. for now though there is an interesting thread on SPCR theorising on the significance of this TDP rating.

http://forums.silentpcreview.com/viewtopic.php?t=30774

Marc
 
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Why dont you just go to XS??? they have been using this program for ages and have lots of results and overclocks that they can correlate.

The works been done already. this forum gets everything XS gets but 6 months later and with less overclocks as everyones scared of volts over here.

Tom
 
welshtom said:
Why dont you just go to XS??? they have been using this program for ages and have lots of results and overclocks that they can correlate.

The works been done already. this forum gets everything XS gets but 6 months later and with less overclocks as everyones scared of volts over here.

Tom
Click to expand...
What caused this reply from you :confused:
 
Standard CPUID: Family: F, Model: 3, Stepping: 2
Extended CPUID: Family: F, Model: 23, Stepping: 2
CPUID String: 20F32
Processor APIC: 0
Processor: AMD Athlon 64 X2 3800+ (Toledo)
CPU Speed: 2507.42 (250.74 x 10.0)
Revision: JH9-E6
Platform: Socket 939
Startup VCore: 1.350v
Maximum Case Temperature = 65C
TDP: 71.9 Watts

Just my tuppence worth......
 
Someone got out the wrong side of bed today :)

Not everyone reads XS, and as can be seen by the number of posts in this thread it seems to be a topic of discussion quite a few people are interested in talking about here. Or perhaps we should forget about these forums and just move to XS? :p

I for one am finding it interesting to see the range of TDPs we have among the ocuk members. They all seem to be nice chaps so I'm quite happy to chat with them about it even if it is rehashing ground covered elsewhere :)

Marc
 
I have to say, from my experience, the tcasemax is a good indication of overclockability. The following clocks on chips are all prime stable.

Opteron 146 CABNE 0530APMW - Tcasemax: 65c - 3300mhz @ 1.55v (phase)
Opteron 146 CABYE 0543FPMW - Tcasemax: 63c - 3200mhz @ 1.55v (phase)
X2 3800 LDBHE 0605DPMW - Tcasemax: 59c - 3000mhz @ 1.62v (phase)
Opteron 144 CAB2E 0540VPMW - Tcasemax: 55c - 2700mhz @ 1.6v (air)

I also had a 3700 SD but I can't remember the tcase max on that chip.
 
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