Re: Dupal Opteron on Sarge
Paul ,
thanks for the corrections below (Hypertransport), I mistook the word ;-o.
I also agree with you that the cooling SHOULD be same for 246-252 , but my
experience shows me that its not.
The Zalman most certainly qualifies for all CPUs here ;-) (its one of the
few around) , but its not necessarily small ;-)
Best regards
Nils Valentin
Tokyo / Japan
http://www.be-known-online.com
>> Another concern is the heat those CPU beasts produce (90W each). You may
>> want to find a cooler solution which doesnt grill you or the CPU and
>> also
>> doesnt make you death. (I am sitting next to such a beast right now ;-)
>>
>> Most cooling systems go up to the 246 or 248. Finding one for the 252
>> might be difficult. I had a hard time finding a cooler which would do
>> his
>> job for the 248 while still allowing me to hear my own voice ;-).
>
> IIRC the 252 has the same thermal rating (89W) as the 246, so the cooling
> system should be the same. Even the dual-core chips are only 95W. Most
> Opteron cooling systems should be able to cope with any of these. The
> Zalman
> coolers are very quiet and more than capable of coping with these CPUs.
>
> If you're bothered about heat/noise you should probably go for the HE
> cpus.
> These are more expensive, but only generate about half the heat (55W). A
> 246HE runs exactly the same speed as a regular 246.
>
> You should also look at the Athlon64 X2 CPUs. For many workloads these are
> just as good as a dual socket board. Obviously with a dual socket board
> you
> have the option of building a quad-core machine.
>
>> Note that 2xCPU systems are not twice as fast as single CPU systems. The
>> SMP setup does have a bit of a overhead on your OS, so expect something
>> like 0,8x the speed of a single CPU system.
>
> amd64 systems scale pretty well up to [at least] 4 CPUs. In my experience
> much
> better than Intel systems. I've seen CPU/memory intensive workloads scale
> linearly. Obviously if your workload is IO bound throwing more CPUs at it
> probably won't help at all.
>
>> What the 2xCPU system gives you however, is the ability to handle heavy
>> load. It can handle obviously more requests than a single CPU system. It
>> will also take advantage of the hyperthreading bus *communication bus
>> between the CPUs.
>
> Hypertransport, not Hyperthreading.
>
>> This means that CPU1 can *borrow Memory from CPU2 if it is required for
>> an
>> application.
>
> It's worth noting that even remote memory (ie. attached to the other CPU)
> is
> still closer (lower latency) than system memory on many Intel systems.
>
> Paul
>
>
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