Hi there,
Apparently the Siglent SDS2104 (NOT X) has a 28M point sample memory. I've seen some manufacturers be a bit naughty and measure it in bits, each sample is 8 bit and so you should divide by 8. Or it does some weird channel multiplexing thing and divide by 4 for that as well turning a figure where 28M bits is technically true to a much less impressive 875k point.
Can someone confirm what it does please?