low bandwith: chipset problem?

Hi all.

bandwithTest gives me a really low bandwith:

Running on......

	  device 0:GeForce 8800 GTS 512

Quick Mode

Host to Device Bandwidth for Pageable memory

.

Transfer Size (Bytes)	Bandwidth(MB/s)

 33554432		791.2

Quick Mode

Device to Host Bandwidth for Pageable memory

.

Transfer Size (Bytes)	Bandwidth(MB/s)

 33554432		223.2

Quick Mode

Device to Device Bandwidth

.

Transfer Size (Bytes)	Bandwidth(MB/s)

 33554432		50964.5

&&&& Test PASSED

Press ENTER to exit...
Running on......

	  device 0:GeForce 8800 GTS 512

Quick Mode

Host to Device Bandwidth for Pinned memory

.

Transfer Size (Bytes)	Bandwidth(MB/s)

 33554432		2704.9

Quick Mode

Device to Host Bandwidth for Pinned memory

.

Transfer Size (Bytes)	Bandwidth(MB/s)

 33554432		293.6

Quick Mode

Device to Device Bandwidth

.

Transfer Size (Bytes)	Bandwidth(MB/s)

 33554432		51044.9

&&&& Test PASSED

Press ENTER to exit...

I got the same value both in windows xp and ubuntu 9.10 environments, with different driver releases (196.21 win - 195.38 ubuntu)

I read it could be a chipset problem, so I’m wondering if anyone can confirm problems with Ati XPress 3200 chipset (my mobo is an Abit AT8-32X). Of course I’ve tried both the PCI-EX 16x slots, with the same results.