Memory bandwidth problem ? - R900 32Gb

[kfx]

Hello,

we bought a R900 (4 x7350 CPUs, 32Gb RAM) and we are doing some 
benchmark on it (mainly hpl and the stream benchmark).
The results of the stream benchmark are strangely low:

-------------------------------------------------------------
Function      Rate (MB/s)   Avg time     Min time     Max time
Copy:        2112.3676       0.0152       0.0151       0.0152
Scale:       2207.4921       0.0145       0.0145       0.0145
Add:         2383.5787       0.0202       0.0201       0.0202
Triad:       2410.9814       0.0199       0.0199       0.0199
-------------------------------------------------------------
Solution Validates
-------------------------------------------------------------

The OS is RHEL 5.1 fully updated.
BIOS settings:
Adjacent Cache Line Prefetch = Disabled
Hardware Prefetcher =  Enabled

I took the source code of stream there: 
http://www.cs.virginia.edu/stream/FTP/Code/stream.c
and compiled it with a simple gcc command.

Do you think this is a normal score for this computer ?

Thanks,
kfx.