Thanks Robin for your fast reply.
I'm using ML605 revE (with 1GB DDR3-RAM 512MB used), ADI-FMCOMMS1 revB, and no-OS software latest version from gitHub.
I think I don't any rate issue, since it's ok with the rate I'm using (245.76MSPS) with lower number of samples. However, when I increase the number of samples to be captured, from (8*1024 = 64KB) the register 0x088 shows over(/under) flow and the following message appears:
adc_capture: overflow occured, data may be corrupted
What are the tweaks you are talking about, then?
Nevermind about my last Question.
Bests
FArid