I will add some pictures later to clarify the measurement method.
Guaranteed max segment speed:
All settings visible in next image are from test using 50ns/div in SDS2000X HD.
Images where is looked signal out from SDS2000X HD Trigger Out, oscilloscope is SDS2000X Plus.
Generator used in test is SDG1062X.
(note that frequency fine adjusted so that is around 1ppm up from 456 or 457kHz in these images.)
Maximum average, "up to" segment speed over one sequence:
These all are measured using 160MHz continuous sinewave out from old obsolete SDG5162.
This wfm speed is only for fun or for some experimental playing.
We can still say Sequence acquisition
typical maximum speed is 500kwfm/s (inside one sequence).
Guaranteed maximum continuously repeatable speed is, at this time, least 450kwfm/s (inside one sequence).
ETA: Table Note 1. There is "Until now and so far I have no idea about reason for this random drop out behavior. Perhaps, Least I hope, later this is repaired."
It is there because I have feel that there is some weird thing what lead to these rare random drop outs even down to 456kHz (50ns/div and 80000 segment). Some times with 457kHz test burst it need wait really long time before drop out. Same with example 480kHz, 490kHz... even 500kHz not every sequence fails. What is reason to this random "hick up" what rise time before next trig is possible.
And more reasons. Example SDS2000X Plus (8 bit mode) behave very different. Guaranteed speed borderline is very clear. 517kHz burst pass in long run (also 517.6kHz) and then 518kHz burst fails immediately (clear borderline is between 517.65kHz and 517.75kHz. just as 0 and 1)
This is also why I hope and also believe it is later improved.
Signal source setup. Ch1 to oscilloscope via coaxial. Ch2 in tracking mode and go to HP53131A with HQ ref for check true freq. This is separated fore make sure that I do not disturb test signal in any case during perhaps several hours running one test period.
ETA: added this previously missing image
SDS2504X HD display after one sequence (all 80000 segments with every sample dot stacked on top of each other)
Passed test looks like this when no single pulse dropped out when long time run repetitively sequence acquistions (here signal burst period is 2s)
Naturally test need drive long time (also done) before it can say it is passed. Even after then number for quaranteed speed is rounded down based experiencve how it behave near this limit speed.
In this image test is failed. So input signal frequency is too high. After some random time running this test there happen drop out.
If there is dropped example one pulse. Trigger out signal queye is still same length in time but somewhere inside there is one gap without pulse.
Sequence is stopped example to 79999th segment. Then after short time generator start next burst. Missing pulse is now captured and sequence is ready for processing for image. During this time in this case rest of this burst is lost. And then later next burst again and probably ok... until after random time, next burst or after several hours again one pulse drop out. (as long as input is faster than maximum guaranteed speed)
Just for fun, this is how SDS2000X HD Trig out looks when Sequence mode and input is 160MHz and we get inside sequence average speed value 583kwfm/s
Naturally this can use for some experimental fun pastime experiments.
As previously told Sequence acquistion. 50ns/div, input 160MHz continuous sine. Top of image can see two sequences. (note that gap between sequences depends what need draw to display and how after every sequence captured before next sequence can start.)
ETA:
Also need one important extra note. For these tests this is absolutely mandatory: Trigger Holdoff: None! 
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