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poor data transmission form PXI 5122

Hi everybody
I am using a PXI 5122 in a chassis PXI 8176 embedded controller(Pentium3 512MBRam), and the transfer is poor. With 10MSamples/s I get an error after 3-4 seconds. I would need sample-rates of 50MS/s for about 5-10 seconds. I use LabView 8.2
The error message is:
Error occurred at:  niScope Multi Fetch WDT.vi:4
<err>Driver Status:  (Hex 0xBFFA4018)
The requested data has been overwritten in memory so it is no longer available for fetching.
Status Code: -200004
The transfer is far behind the theoretical limit. Any ideas how I could improve the transfer rate?
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Any updates on this issue? I appologize for bringing up an old topic, but I am having a similar problem right now.

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Haha, I can't even remember that topic. I bought several new devices since then with PXIe connection. That solved the problems

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