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 > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact > [EMAIL PROTECTED] > > -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
