Archived from groups: alt.comp.hardware.pc-homebuilt (
More info?)
Jim wrote:
> Bill wrote:
>
>> "Jim" <james@the-computer-shop.co.uk> wrote in message
>> news:jANwe.10807$iT1.10543@newsfe1-win.ntli.net...
>>
>>
>>
>>> PS: I build exclusively on AMD gear, as it's cheaper and I know some
>>> tricks to keeping those things running stone cold.
>>>
>>
>>
>> Just out of curiosity, do you find that the Athlon 64s run cooler than
>> the older Bartons?
>>
>>
>>
>
> very much so. Particularly when running a 32-bit OS, where I'm not using
> the 64-bit extensions, the processor is never going to be running at
> full capacity. Plus the fact that the overall power consumption is
> piddling compared to P4:
>
> CPU Idle(W) Capacity(W)*
> P4HT 75 130
> AMD64 3 38
> Barton 45 68.3
>
> *Values are typical on factory clocked chips. Figures from various
> sources, including Tom's Hardware.
I don't know what conditions those sources used to create those numbers but
specification sheet numbers are, in descending order
Intel P4 Extreme, 660, 670 max 115 Watts
Athlon 64 3500+, 3800+, 4000+ max 89 Watts
Intel P4 630, 640, 650 max 84 Watts
Barton 3200+ max 77 Watts
Barton 3000+ max 68.3 Watts
For a 2400MHz Athlon 64 3500+ to be at 39 watts you'd be running the P3
state at 1800MHz, similar to Intel's Enhanced Speed Step approach of
lowering clock and Vcore for power savings.
> So it can be seen, that while the P4HT has the advantage over Barton in
> idle consumption, both the Barton and the AMD64 run rings around it at
> peak running 32-bit platforms; the AMD64 peaks around 50-52W when
> running 64-bit platforms, which is comparable to an overclocked K6/II.
A stock 550 Mhz K6-II is 18 watts max but I have no idea how you'd get it
to 50-52W, and keep the smoke inside.
>