There were an increasing number of cheap, proprietary PCs in the late 1990s many of which couldn't be upgraded well, or at all. But this Dell Dimension XPS could be almost as good as a custombuilt computer.

Sources:
"Professional PCs," PC Magazine, December 2, 1997.
Ensoniq AudioPCI photo: https://en.wikipedia.org/wiki/Ensoniq...
"Company News," The New York Times, December 11, 1997.
"Pentium Part II," PC Magazine, June 10, 1997.
Pentium Pro photo: https://commons.wikimedia.org/wiki/Fi...
Pentium II commercial:    • Intel Pentium II Processor Commercial...  
Pentium II photo: https://commons.wikimedia.org/wiki/Fi...
"AMD challenges Intel with cheaper MMX chip," Computerworld, April 7, 1997.
"Intel's Celeron 266," PC World, May 1998.
Slot 1 Celeron photo: https://commons.wikimedia.org/wiki/Fi...
"Celeron CPU Caches Up, Adds Muscle to Basic PCs," PC Magazine, October 6, 1998.
"Celeron 300A," Maximum PC Power User Handbook, autumn 2000.
Pentium II in box photo: https://wiki.preterhuman.net/index.ph...
Socket 370 photo: https://commons.wikimedia.org/wiki/Fi...
Socket 370 slotket adapter: https://postlmg.cc/4K6p8jmw
"Rage 128," Maximum PC, February 1999.

00:00 Introduction
01:11 Drives and ports
01:53 Not quite what it seems
04:35 Upgrades
06:09 The Slot 1 story
09:24 Reassembly and cleaning
11:19 I should have installed Windows Me on this
12:34 Video cards kinda sucked back then, but we still liked them
13:31 passport.mid is the best, fight me
15:40 It's a good computer

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Music by Epidemic Sound (https://www.epidemicsound.com).
Intro music by BoxCat Games (https://freemusicarchive.org/music/Bo....