You don't know that and neither do I. Nothing has been tested yet and I cannot locate an SM-1000 review to compare. Maybe you can?
Purchasers of the Model 10 won't really care about the internal amplifier "modules" in isolation, they care about the rated performance of the
entire product- from input to output.
Marantz is selling an
integrated amplifier here. "Integrated" means input selection, control, volume, preamplification, power amplification and output switching. A Purifi module is NOT that. It is merely a component. A bit like comparing the specs of a D/A chip with the advertised specs of the completed product.
The fact being Marantz themselves don't seem to know the difference when they advertise it as the most powerful highest performing
amplifier they've ever made...
Their claim:
View attachment 390301
It may well turn out to be extremely powerful. It will no doubt exceed its rated specifications. But will it be the most powerful Marantz ever? Consider the SM-1000 ran +/-100V main rails and had 16 output devices per channel, twin 800VA transformers (1 for each channel) and 4 x 20,000UF 125V main caps. The Purfi can swing a maximum of 90V. The maximum module voltage is supposedly +/-48V. Do the maths on peak power and tell me which one wins- the SM-1000 by a mile. It all comes down to regulation and device losses. The Purifi wins on losses, but loses on available swing in the first place.
Purifi's own spec sheet says the 9040 will do 750W@4R@1% which is ~55VRMS (+/-77.8Vpk). It hits the wall hard at 400W@8R. Maybe throw a few more volts at it for the Marantz Model 10 SMPS, I dunno- maybe they did.
I don't have an SM-1000 (wish I did) but bear in mind it's conservatively rated at 400wpc@8R. Into 4R it will be close and the 9040 would win with 2R. The new Model 10 will likely outperform the SM-1000 example I used with inherent THD.