SDS2104X-PLUS:
200 Mpts (per ADC?)
Per ADC!
SDS2104X-PLUS:
Single Math channel.
No digital filters.
Different architecture (older) and memory management (a bit less responsive on large captures)
Two math channels. And as I’ve stated multiple times already, there are just not enough resources (FPGA, memory) to support more. Therefore, we’ll never see 4.
Digital filters on the other hand might come with one of the next updates. In fact I’ve already seen them working, yet there is also manual memory management (for providing constant sample rate mode) belonging to that package, and this is a major task with low priority.
The architecture is not different. The SDS2000X Plus was the first instrument with 16-bit internal data processing, which it needed for its 10 bit mode. As one could imagine, this also was the test run for the future (back then) 12-bit scopes in the pipeline.