Why does getdate() function return same time value for multiple select statements executed sequentially

When I run the following code
set nocount on
declare @i table(id int identity(1,1) primary key, sDate datetime)
while((select count(*) from @i)<10000)
begin
insert into @i(sDate) select getdate()
end
select top 5 sDate, count(id) selectCalls
from @i
group by sDate
order by count(id) desc
I get the following results.
sDate selectCalls
2014-07-30 14:50:27.510 406
2014-07-30 14:50:27.527 274
2014-07-30 14:50:27.540 219
2014-07-30 14:50:27.557 195
2014-07-30 14:50:27.573 170
As you can see the select getdate() function returned same time up to the milisecon 406 time for the first date value. This started happening when we moved our applications to a faster server with four processors. Is this correct or am I
going crazy?
Please let me know
Bilal

Observe that adding 2 ms is accurate only with datetime2. As noted above, datetime does not have ms resolution:
set nocount on
declare @d datetime, @i int, @d2 datetime2
select @d = getdate(), @i = 0, @d2 = sysdatetime()
while(@i<10)
begin
select @d2, @d, current_timestamp, getdate(), sysdatetime()
select @d = dateadd(ms,2,@d), @i = @i+1, @d2=dateadd(ms,2,@d2)
end
2014-08-09 08:36:11.1700395 2014-08-09 08:36:11.170 2014-08-09 08:36:11.170 2014-08-09 08:36:11.170 2014-08-09 08:36:11.1700395
2014-08-09 08:36:11.1720395 2014-08-09 08:36:11.173 2014-08-09 08:36:11.170 2014-08-09 08:36:11.170 2014-08-09 08:36:11.1700395
2014-08-09 08:36:11.1740395 2014-08-09 08:36:11.177 2014-08-09 08:36:11.170 2014-08-09 08:36:11.170 2014-08-09 08:36:11.1700395
2014-08-09 08:36:11.1760395 2014-08-09 08:36:11.180 2014-08-09 08:36:11.170 2014-08-09 08:36:11.170 2014-08-09 08:36:11.1700395
2014-08-09 08:36:11.1780395 2014-08-09 08:36:11.183 2014-08-09 08:36:11.170 2014-08-09 08:36:11.170 2014-08-09 08:36:11.1700395
2014-08-09 08:36:11.1800395 2014-08-09 08:36:11.187 2014-08-09 08:36:11.170 2014-08-09 08:36:11.170 2014-08-09 08:36:11.1700395
DATE/TIME functions:
http://www.sqlusa.com/bestpractices/datetimeconversion/
Kalman Toth Database & OLAP Architect
SQL Server 2014 Design & Programming
New Book / Kindle: Exam 70-461 Bootcamp: Querying Microsoft SQL Server 2012

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