Performance effect if SQL2000 and SQL2005 on same box

Hi everyone,
I am going to upgrade SQL2000 to SQL2005 because 3rd party application
requires SQL2005. My plan is upgrade my current database on SQL2000 to
SQL2005, but keeping SQL2000 for fall back plan.
Is there any impact on performance if I have SQL2005 and SQL2000 running on
the same machine?
Thanks alot for any help in advance.
Han.
The issues are not different from running two SQL2000 instances or two
SQL2005 instances.
Linchi
"Han" wrote:

> Hi everyone,
> I am going to upgrade SQL2000 to SQL2005 because 3rd party application
> requires SQL2005. My plan is upgrade my current database on SQL2000 to
> SQL2005, but keeping SQL2000 for fall back plan.
> Is there any impact on performance if I have SQL2005 and SQL2000 running on
> the same machine?
> Thanks alot for any help in advance.
> Han.
sql