Hi Anton,
Yes your are correct regarding the SX6025T support FDR10 only, while F in SX6025F - means full FDR support.
In your original questions you mention the following:
"I plan to buy SX6025T (FDR10) or SX6036F switch".
Based on your last comment I see that SX6036F was meant to be SX6025F.
In that case, no testing has been done by Mellanox using DDR cards with the SX6025T or SX6025F switches.
Marlon