[quoted text, click to view] "Erland Sommarskog" <esquel@sommarskog.se> wrote in message
news:Xns96498F38CCEB0Yazorman@127.0.0.1...
> (grouparchive@gmail.com) writes:
> > We are upgrading our SQL Server hardware because we need more CPU
> > power. The current server is a P4 3.2 GHz with HT.
> >
> > The system we have been looking at is a dual Opteron, and the questions
> > is: will two Opteron 244 (1.8GHz) give considerably more CPU power than
> > a single P4 3.2 GHz? Or would we need to get two Opteron 250 (2.4 GHz)
> > to really get a notable increase in CPU power?
> >
> > The plan is to get single core Operons first and then plug in two dual
> > core opterons later on if needed when they are available and maybe a
> > little bit cheaper.
>
> Opteron is a 64-bit processor, isn't it? I believe that currently the
> only 64-bit processor which there is a 64-bit version of SQL Server
> is Itanium.
>
> And while you can run 32-bit software on 64-bit hardware, this is not
> a very good idea if it's performance you are looking for.
>
Actually, with the Opteron design, I don't believe there's any loss in
performance, unlike the Itanium.
Having said that, my first real question would be:
Are you (the original poster :-) absolutely sure you need more CPU power? I
find memory and I/O tend to be the first physical bottleneck.
But often poor programming (such as cursors) tends to dominate.
Also, rather than just raw CPU power, I'd look at on-board cache. Which
ones have the largest L2 cache? I find that a doubling in cache can make
for dramatic improvements in performance.
[quoted text, click to view] >
> --
> Erland Sommarskog, SQL Server MVP, esquel@sommarskog.se
>
> Books Online for SQL Server SP3 at
>
http://www.microsoft.com/sql/techinfo/productdoc/2000/books.asp