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To my knowledge QuestaSim is released for the Verification purpose only by Mentor Graphics in support from Cadence.
But ModelSim is from Metor Graphics only
Both come from Mentor Graphics.
Questasim is 32 or 64bits like modelsim. The name have changed when new language like e, sv, ams... have been supported by Mentor. By behind this, that is the same engine.
---------- Post added at 20:06 ---------- Previous post was at 20:05 ----------
and after that you have Questasim or Advance MS package, both of them have Questasim behind, the second are "ready" for mixed simulation with spice model, connected to Eldo simulator.
ignore the responses from #2 & #3. rca is correct.
Questa is Mentor's flagship product that has full System Verilog simulation support. Modelsim is an older product that has limited support for System Verilog. If you plan on using OVM/UVM then you would want to go with Questa, otherwise Modelsim is good enough.
From the following product description pages it looks like Questa's simulation kernel was written to take advantage of multi-core processors, and should have higher performance for large designs. I've never had the opportunity to use Questa for any extended period of time as the places I've worked never wanted to fork over the premium cost over a Modelsim license to get Questa.
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