I just hit this topic while googeling.
I spend the last few days doing exactly this: Building a V5 5500 rig. Since my last attempt, I have exchanged the V5, this time I got a fully intact model, which runs on all my vintage boards.
I have so far assembled two machines, but can't make my mind up. Reading this thread doesn't make it easier.
I have an Asus P3B-F with a selection of P2/P3 CPUs, among them a p2-400 with open multiplier, a p3-900/100 and a p3 1000/133. I am somewhat worried about exposing the V5 to 89 MHz AGP, when using the P3-1000. So 1000 MHz would be reached by oc'ing the p3-900 to fsb 112.
That sounds like a nice system: It is silent, can run a CPU clock as slow as 133 MHz, it has two ISA Slots. The only problem is the juicy alternative:
An Athlon XP-M 2600+ (512MB Cache) on an Epox 8KTA3PRO, with 1xISA. I finally got the plan to work, thanks to Retro Games 100, who suggested the board.
Within Win98se, I can change the speed from 300 MHz to 1500MHz or from 450Mhz to 2000 MHz! (or more if OC) I can boot to Dos with a speed selection of 500 MHz to 1200 MHz. As an added incentive, the board has USB2.0 and works well with a fast internal card reader.
As a display, I got myself a 16:10 Dell that has selectable aspect (5:4 or 4:3) and offers 1600x1200 (I love it).
So which system should I finalize? The later system has more sex appeal, is way faster and gets the last 20% performance out of the voodoo5. The Intel System has a few advantages on closer inspection:
Except for the Voodoo5, I have every component more than once. It has a lower TDP and runs practically silent. Being able to run at virtually any clock from 133 MHz upward gives it a lot of flexibility for games like Magic the Gathering (where Shandalar has a speed issue) or Turbo Pascal strategy Games (Runtime 200 Error).
Most later Dos games handle 133-233 MHz without hickups. 500 MHz on the Athlon may be a bit too much.
Then there are the games to be played: Jane's Simulations are high on the list. Wing Commander and such. Dos Strategy (SSI, SSG ...) games.
For DOS speed adjustment, 500-1200 MHz (in steps of 100) without cache simulate a 286-386 rather well. Wing Commander will work at the right speed in that range.
Retro PC warning: The things you own end up owning you.