X Series vs. M Series DDK

In 2009 I completed a project involving the M Series DAQ board NI PCI-6251. I developed a kernel module for PureDarwin. I developed a user space measurement controller based on the MHDDK nimseries/nimhddk_other. Worth to mention is a very involved work on self callibrating the NI PCI-6251, and I posted some questions and results in this forum.
Now I am going to start another project on FreeBSD. The kernel module is ready, and for prooving the concept, I testet the setup with an old NI PCI-6251, and everything is working so far. Anyway, I need to buy a new board for the new project, I am in doubt whether I should stay with the M Series technology or whether I should start the new project directly with a new X Series board.
So my questions are:
Is the X Series DDK quite similar to the M Series DDK...?
... could I use most of my old M Series code with X Series, perhaps with some tweaks,
or would I need to start from scratch?
What would be the major benefits of X Series over M Series?
With  PCI-6251 I achieve in 2 AI channel multiplexing 500 kS/s. It would be good to achieve 1 MS/s for 2 AI channels.
I would also love to have more flexibility of AO full scale, the PCI-6251 got 5 V and 10 V. For one mode of operation I would need 100 mV.
Can I get this with a X Series board at more or less the same price tag as the PCI-6251 (let's say perhaps 50 % more)?
Many thanks for any advises
Best regards
Rolf 
Solved!
Go to Solution.

Hello Rolf,
The X Series and M Series DDKs are alike in concept, but very different when it comes to details. There are many differences between the M Series register map and the X Series register map. These differences at the lowest level mean that pretty much all of the register logic that you implemented for M Series will need to be changed for X Series boards.
You can find benefits and general information here:
http://www.ni.com/xseries
Here is a listing of X series devices as well as their capabilities.
http://sine.ni.com/np/app/main/p/bot/no/ap/daq/lang/en/pg/1/sn/n21:41,n17:daq,n23:11502/sb/+nigenso7...
I would also recommend contacting a technical sales representative with your specifications. They will be able to recommend the right board.
I hope this helps,
Steven T.

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