Google cache shows that all of that are upgrade options.
If not, Rigol could suffer a big blow.
Unless the boot time is not pleasant...
Edit: I also searched the cache
and, now, I'm not so sure... It seems the prices are for the base models: MXO5-B245 $4,120.00 Upgrade 500MHz
MXO5-B2410 $9,680.00 Upgrade 1 GHz
MXO5-B2420 $12,875.00 Upgrade 2 GHz
MXO5-B282 $3,890.00 Upgrade 200 MHz
MXO5-B283 $9,040.00 Upgrade 350 MHz
MXO5-B285 $16,250.00 Upgrade 500 MHz
MXO5-B2810 $25,520.00 Upgrade 1 GHz
MXO5-B2820 $30,670.00 Upgrade 2 GHz
MXO5-B110 $3,090.00 Memory upgrade 1Gpts
MXO5-B6 $1,440.00 Waveform generator
MXO5-K31 $2,470.00 Power Analysys
MXO5-K36 $2,470.00 Bode Plot
MXO5-K520 $2,885.00 CAN, CAN-FD, CAN-XL decoder
(from the Newark cached pages, as above)