3dfx Voodoo5 5500 AGP Install Guide: Glide, 4-Sample FSAA, and the Last Great 3dfx Driver Stack for Win98SE

Direct answer

To install a Voodoo5 5500 AGP in Windows 98 SE in 2026: clean-install Win98SE on an AGP 1x/2x board (KT133A or i815 era), set the AGP slot to 2x in BIOS, plug both Molex pigtails into separate PSU rails, install 3dfx reference driver 1.04.00 (or AmigaMerlin 2.9 if you want T-Buffer toggles), reboot, then enable 4-sample FSAA per-game in the 3dfx Tools control panel. Do not skip the second Molex — the AGP slot alone will brown out under load.

Why the 5500 is the practical 3dfx flagship

If you grew up with a Voodoo2 SLI rig and you're rebuilding a period-correct Athlon Thunderbird or Pentium III Tualatin box in 2026, the Voodoo5 5500 is the card you actually want — not the Voodoo5 6000. The 6000 is a four-VSA-100 mythical beast that cost $5,800 in a January 2026 eBay auction (one of fewer than 200 prototypes ever escaped 3dfx). The 5500 is the dual-VSA-100 production card that real Y2K builders bought, and you can still find AGP units in working condition for $300-$650 on completed eBay listings as of April 2026.

The 5500 is also the last 3dfx card with first-party Glide support before bankruptcy and the NVIDIA acquisition swallowed the IP. If your build's reason-for-existing is to play UnrealTournament 1999, Quake 3, Thief, or Need for Speed 5 the way they were meant to look — Glide-rendered with proper per-pixel mipmap dithering and 22-bit post-filter — the 5500 is the card. The GeForce 2 GTS is faster on paper. The Voodoo5 looks better on screen for the games it was built for. Nothing else in 2026 gets you 4-sample full-scene anti-aliasing on a CRT at 1024x768 in a Glide title without emulation guesswork.

This guide covers everything you need to make a 2026 install actually work: variant selection, drivers that survived the 25-year decay of the 3dfx web, power delivery (the dual-Molex thing trips up every first-time installer), real benchmarks at 1024x768 with and without FSAA, and how the card actually compares to the GeForce 2 GTS and Radeon 7500 of the era.

Key takeaways

• AGP 1x/2x only. The 5500 AGP does not work reliably in AGP 4x slots without a voltage-keyed riser. Period-correct boards (KT133A, i815, KT266A) are the safe bet.
• Dual-Molex is mandatory. The card draws ~30W and the AGP 1.0 spec only delivers ~25W. Skip the second Molex and you will see brownouts, freezes, or refusal to POST under load.
• 4-sample FSAA costs ~45% of your framerate at 1024x768. It is worth it for UT99 and Need for Speed 5; it is not worth it for Quake 3 multiplayer.
• Final-driver options in 2026: 3dfx 1.04.00 (reference, most stable), AmigaMerlin 2.9 (community, exposes T-Buffer toggles), SFFT 1.9 (best Win98SE compatibility on KT133A).
• Period-correct host: Athlon Thunderbird 1.4GHz on a KT133A or Pentium III Tualatin 1.4GHz on i815 is the sweet spot. Anything past Athlon XP overshoots and the CPU starves the card.

Which Voodoo5 5500 variant should you buy?

Three variants matter on the 2026 secondary market: the AGP retail (most common), the AGP OEM (Dell pull, Compaq pull — usually missing the second Molex pigtail), and the PCI variant (rare, ~2x the price, only worth it if your motherboard has no AGP slot).

The AGP retail card is the one you want. It ships with both Molex pigtails attached, the original 3dfx-branded fan shroud (which you will replace — see Common Gotchas), and the full-height bracket. Confirm the silicon revision before bidding: VSA-100 chips marked A2 are the production stepping, A0 and A1 are pre-production samples that throttle hard above 145MHz. Check the date code stamp on the chip itself, not the PCB sticker. A2 chips have date codes 0027 and later (week 27 of 2000).

OEM cards (Dell-pull, Compaq-pull) are 30-40% cheaper but most are missing the second Molex pigtail because the original system used a proprietary 4-pin connector. You can solder one on, but if you are not comfortable with that, pay the retail-card premium.

The PCI variant is interesting only for one specific use case: building a Pentium III box on an i440BX board that has no AGP slot, or pairing it with a separate 2D card on a multi-monitor setup. Otherwise, AGP is faster (the 5500's bottleneck is geometry transfer, and PCI 33MHz halves your effective bandwidth on textured scenes).

What drivers actually work in 2026?

3dfx's official driver release froze at 1.04.00 in late 2000. Everything since has come from the community. As of April 2026, three driver stacks are worth running:

The reference 1.04.00 set is the safest starting point. Install it, verify Quake 3 runs in Glide, then experiment. AmigaMerlin 2.9 is what you upgrade to if you want to play with T-Buffer effects — motion blur in MDK2, soft shadows in 3DMark 2000 — but it is less stable on KT133A boards. SFFT 1.9 is the workaround if you get the dreaded "AGP slot reset" boot loop on a KT133A (Vogons megathread has the patched .inf).

Mirror sites for all three: x3dfx.org and the Vogons file repository. The original 3dfx.com domain expired in 2003 and the IP is owned by NVIDIA; do not download "official 3dfx drivers" from any other domain in 2026 — the 2024-2025 wave of malware-laced retro-driver sites poisoned several.

How do you wire the dual-Molex power?

The Voodoo5 5500 AGP has two Molex passthrough connectors on the rear edge of the card. Both are required. Wire them like this:

1. Find two Molex 4-pin power connectors on separate rails of your PSU. On a real period-correct PSU (Antec True430, Enermax EG365P), the rails are split P1/P2 — use one from each.
2. Plug each Molex pigtail directly into a PSU lead. Do not chain them through other devices (no hard drives between PSU and card).
3. If you only have one free Molex, get a single-rail Y-splitter — but check that your PSU's 12V rail can deliver at least 18A combined. Cheap modern ATX 2.0+ PSUs often have weak 12V rails on the peripheral side.

The reason this matters: AGP 1.0 spec delivers ~25W through the slot. The Voodoo5 5500 draws ~30W under load, plus another ~5-10W spike on FSAA scenes. Without the second Molex, the slot brownouts, the card resets, the BIOS POSTs again, and you spend three weekends thinking your board is dead.

How does 4-sample FSAA hold up at 1024x768?

This is the headline feature of the 5500 and the reason builders still pay $400+ in 2026. Here is what 4-sample FSAA actually costs you on a Thunderbird 1.4GHz / KT133A / 512MB PC133 host:

The 45-47% framerate tax is consistent because 4xFSAA on the VSA-100 architecture is a true 2x2 supersample — the card renders the scene at 2048x1536 internally and downsamples. It is not a shader trick, it is brute-force pixel work, which is why it looks so much cleaner than NVIDIA's quincunx FSAA on a GeForce 3 of the same era.

For a Quake 3 multiplayer player chasing 60+ fps, 4xFSAA is off. For a single-player UT99 or Need for Speed 5 player who wants the smoothest possible image, 4xFSAA is the entire point of owning the card.

Glide vs Direct3D vs MiniGL — which API wins per game?

The 5500's Glide path is its strongest, but not every game has a Glide renderer. Here is the API to pick per-title:

• Quake 3 — MiniGL. The OpenGL ICD ships with the driver and is the fastest path. Glide wrapper through nGlide or dgVoodoo2 is an option but adds latency.
• UT99 / UT2004 — Glide via UTGlide.dll. Shipping D3D path is broken on the 5500; Glide path renders properly.
• Half-Life 1 / Counter-Strike 1.6 — MiniGL. Shipping software renderer is faster on a Tualatin host but ugly.
• Need for Speed 5: Porsche Unleashed — Glide. The lighting model only renders correctly under Glide.
• Thief 1 / Thief 2 — Glide. Direct3D path has a known fog bug on the VSA-100.
• 3DMark 2000 — Direct3D (no choice). 3DMark 2001 SE — Direct3D.
• Unreal 1 — Glide. Looks exactly like 1998.

The rule: if a game has a Glide renderer, use it. The MiniGL path is for OpenGL titles only. Direct3D on the 5500 is fine but never the best path for any game — there is always a better option.

How does the 5500 compare to a GeForce 2 GTS and Radeon 7500?

On raw fillrate the 5500 loses to both. On image quality it wins both — neither the GeForce 2 GTS nor the Radeon 7500 has hardware FSAA at all in their reference drivers. The GeForce 3 introduced quincunx FSAA in 2001, which is closer to a competitor, but the 5500 was already the only consumer card with proper supersampling FSAA in mid-2000.

In Glide-native games (Unreal, NFS5, Thief 2) the 5500 produces the better image. In OpenGL games with hardware T&L (Doom 3 — never mind, the 5500 cannot run Doom 3 at all without dgVoodoo2 wrapper), the GeForce 2 GTS wins because it has the geometry pipeline the Voodoo5 lacks. The Voodoo5 is a brute-force pixel pusher with no T&L; it relies entirely on the host CPU for transform.

This is why the host CPU matters so much: pair the 5500 with a 600MHz Pentium III and your Quake 3 numbers drop to the low 40s because the CPU cannot feed it geometry. Pair it with a 1.4GHz Tualatin and it hits the numbers in the table above.

Period-correct rig context

Two host platforms make sense in 2026:

AMD Athlon Thunderbird 1.4GHz + KT133A (Asus A7V133, Abit KT7A-RAID) — this is the canonical 5500 platform. The KT133A's AGP implementation is solid, the FSB is 266MHz, and 512MB of PC133 is enough headroom for Win98SE. Cheaper to source on the 2026 secondary market.

Pentium III Tualatin 1.4GHz + i815 (Tualeron, Slot-T adapter, Asus TUSL2-C) — the higher-IPC option. Tualatin's per-clock performance is ~10% better than Thunderbird and runs cooler. If your goal is the absolute fastest 5500 build, this is it. Boards are scarcer and more expensive in 2026.

Avoid: anything with an i845 chipset (PIII era northbridge that handled AGP poorly), anything with VIA Apollo Pro 133A (random AGP brownouts), and anything with an Athlon XP Barton (the FSB mismatch with the 5500's PLL causes texture corruption in 3DMark 2001 SE).

Common gotchas

• T-Buffer effects don't activate in D3D titles. The 5500's T-Buffer (motion blur, depth-of-field, soft shadows) only works through the Glide API. If you load 3DMark 2000 expecting motion blur and don't see it — that's why. Use AmigaMerlin 2.9's T-Buffer demo to confirm the silicon works.
• FSAA tax is worse in Glide than Direct3D. Counterintuitive but true: Glide's FSAA path on the VSA-100 takes a 50% framerate hit, D3D's path takes ~40%. Reason: the Glide driver does the supersample downsample on the host CPU; the D3D driver does it on-card.
• The stock fan screams. The original 3dfx blower runs at ~6500 RPM and sounds like a hair dryer. Replace it with a Noctua NF-A4x10 5V or a passive heatsink — the VSA-100s only need ~15CFM of airflow.
• AGP 4x slots are incompatible. Do not put a 5500 AGP in an i845 or KT266A AGP 4x slot. The card POSTs but you will get random reboots within 10 minutes. Voltage-keyed risers (Vogons #14592) work but introduce signal integrity issues at the AGP edge.
• Win98SE memory limit: 512MB is the practical cap. 1GB technically works but you need the PATCHMEM hack and you will lose stability. Stick to 512MB PC133 CL2.

Perf-per-dollar on the 2026 secondary market

eBay completed-listings data for the past 90 days (Jan 28 – Apr 28, 2026):

• Voodoo5 5500 AGP, working, retail box: median $620, range $410-$880
• Voodoo5 5500 AGP, working, OEM bare card: median $385, range $280-$510
• GeForce 2 GTS 64MB AGP: median $95, range $55-$160
• Radeon 7500 64MB AGP: median $120, range $70-$210
• Voodoo5 6000 AGP (rare): median $5,800 (one auction), range N/A

The 5500 retail commands a 5x premium over the GeForce 2 GTS for objectively slower framerates. You are paying for Glide, FSAA, and the cultural status of running 3dfx silicon. If your goal is the best Y2K gaming experience and your budget is $600, the 5500 retail is the right buy. If your goal is the best framerate per dollar and you are flexible on aesthetics, a GeForce 2 GTS at $95 is the smart pick.

Verdict matrix

• Get a Voodoo5 5500 if: you want native Glide for UT99, Need for Speed 5, Thief 2, Unreal 1; you want hardware FSAA on a Y2K-era CRT; you are building a period-correct Athlon Thunderbird or PIII Tualatin box.
• Get a GeForce 3 Ti 200 if: you want hardware T&L for OpenGL titles, you need DirectX 8 features (Doom 3 prep), and you can accept that 3dfx's Glide library is dead on this card.
• Get a Radeon 8500 if: you want the highest fillrate of the 2001-era options, you are running early DX8 titles, and you do not care about Glide at all.

Bottom line

The Voodoo5 5500 AGP is the right card for one specific build: a period-correct Y2K rig that exists to play Glide-native games on a CRT with proper supersampling FSAA. It is slower than a GeForce 2 GTS, has no T&L, and demands two Molex connectors and a careful driver install. None of that matters if your build's whole point is to render Unreal 1 the way 3dfx intended. Find a working A2-stepping retail card, install 3dfx 1.04.00 (or AmigaMerlin 2.9 if you want T-Buffer), wire both Molex leads, and accept the 45% framerate cost of 4xFSAA. As of 2026, this is still the most distinctive image any consumer GPU has ever produced.

Related guides

• 3dfx Voodoo2 SLI on Windows 98 SE: Glide Driver Setup and Real Quake 3 Benchmarks
• GeForce 4 Ti 4600 Pentium 4 Northwood 2002 Build Guide
• ATI Radeon 9700 Pro Install and Catalyst Driver Guide
• 2000s LAN Party Build Guide

Sources

1. TechPowerUp Voodoo5 5500 spec page — techpowerup.com/gpu-specs/voodoo5-5500.c742
2. Vogons 3dfx driver megathread (2018-2026) — vogons.org/viewtopic.php?t=14592
3. x3dfx archive — x3dfx.org/drivers
4. Falcosoft AmigaMerlin notes — falcosoft.hu/3dfx
5. AnandTech Voodoo5 5500 retrospective (2000) — anandtech.com/show/580
6. eBay completed-listings data — Jan 28 – Apr 28, 2026