Here's some random Dreamcast footage from the interwebs. Real hardware, not emulation. There's next to no good footage of Aero Dancing i, it's a 60fps game but this video is 48 fps and most others are 30. Other than some old school special effects it's beautiful as the series showed tangible improvements with each new iteration despite how fast they were churning these out. Compared to contemporary PC flight sims like IL-2 Sturmovik from many months later, the planes have great detail, the terrain textures are of good resolution and the pop-in for the 3D structures is quite good (granted some Aero games, i included, also released on PC). That Le Mans video isn't the best in image quality but it shows a full 24 car race with changing tod and weather. I can't find great MSR footage that shows off the insane amounts of fully modeled track detail either. I guess people mostly go back to the arcadey Dreamcast games instead of those that demanded quite some time investment when recording and uploading. Also, anyone who says Dreamcast couldn't do sandbox based on Headhunter forgets the Crazy Taxi games with their great vistas and tons of traffic that could easily be halved and still look dense if it was necessary to accomodate different types of gameplay or increase individual polycount. The pedestrians and what not don't look too bad either and yes, there's pop in, but considering all it throws up every second (again 60fps) it's great.
So, ya, of course it was powerful and
didn't just have Shenmue to prove it. The polycount of the characters in DOA2L and even the dodgy VF3tb surpassed that of TTT and VF4 on PS2 (which btw halves the arcade's so ya they were still very powerful too even if cheaper than before, Naomi 2 was a beast) and destroy that of SoulCalibur which was a crossgen kind of remaster. As great as it looked due to the great modelers at Namco, it's modest technically for what DC could do, so it could have had more such advanced game ports if it had lived longer. Many lesser DC games push more polys than you'd think but don't look like it due to their very inefficient use from either a lack of talent, budget or time, or simply the era's still evolving know how that meant not all studios were equal in their artistry, hence many early PS2 games not looking better for the most part either.
A Voodoo 3 may beat, but not smoke, the DC despite coming out the following year as the top GPU. When did consoles trash PC 3D to single Dreamcast out for not doing the same? All the PC greats had to be cut down to fit, from Quake 3 DC and UT on that and PS2 to the later Championship titles based on Unreal 2 tech. It was just an era PC didn't get much love from Japanese developers which still dominated in technology and artistry and the ports were shoddy if at all, contemporary-ish PCs were superior to all the consoles of the era. Consoles didn't get true love from PC devs either.
Here's an even better PC with a Pentium III. Grand Prix 3 beats the best of DC in ways (I would say it took 2002's Grand Prix 4, whenever that could perform well with high settings, to beat DC games in every way - the crowd seats etc. are pretty bad in 3 but improved in 4 and similar to how consoles devs did it) with crazy effects like puddle reflections, too bad it's a slideshow even with reduced settings when the best on DC are 60 fps and still look slick, with the same res. Quake III commonly drops to ~20fps with reduced settings.
Who would play Ferrari 355 Challenge in 480p 60fps instead of that, huh?! And ya, as said earlier the Voodoo 3 launched cheap, like up to $50 less than a Dreamcast if you were lucky, or roughly the same as! Huh, you need a CPU too?!
Here's Intel's Pentium III launch announcement!
The 450MHz variant is in the last video, it only cost $496, in bulk! A nice cheap ~$715 CPU adjusted for inflation! Stupid DC, why couldn't you smoke a ~$1000 PC (before adjustment, not counting monitor etc.) for your ridiculously expensive $199?! Here are two GPUs you should compare PS2 to if you're gonna compare a Voodoo 3 to Dreamcast (not the GeForce 4, that's an even later but lower end release). I'd say DC compares more favorably to Voodoo 3 than PS2 does to these that also released the following year from its launch.
https://youtu.be/VCCiCn3y3SI
https://youtu.be/lGLSZAhtZ04
The same goes for the previous line of cards actually with almost the same results:
https://youtu.be/Mv5T34ToU24