The Tripp Lite P574-001: a DMS-59 to dual VGA splitter that connects two analog monitors to a single workstation—but only if that workstation has the right port.
That's the answer in one sentence. I'm going to explain why you'd need it, when it works, and when it's a mistake. Because I've watched IT teams waste an afternoon trying to make one of these work with the wrong hardware.
My Credentials: Rush IT Infrastructure and Video Connectivity
I'm a procurement and IT logistics coordinator at a mid-sized logistics company, handling about 40-60 rush orders per quarter. In the last two years, I've personally sourced, tested, and deployed roughly 200 connectivity adapters, splitters, and converters — including at least 20 Tripp Lite P574-001 units — for everything from conference room setups to temporary warehouse offices. Our typical deployment window is 48 hours, so I don't get to theory-craft; I need to know what works.
In July 2024, a client called at 10 AM needing a dual-monitor setup for a shipping control room. Their budget vendor showed up with a DMS-59 to VGA adapter (this exact Tripp Lite model) and a modern Dell Optiplex with DisplayPort outputs. Cue the chaos. The adapter didn't work, the vendor blamed the monitor cables, and the site wasn't ready until 6 PM. The mistake? The adapter was correct, but the hardware wasn't. That's the trap I want you to avoid.
What Exactly Is a DMS-59 to Dual VGA Splitter?
A DMS-59 to dual VGA splitter — like the Tripp Lite P574-001 — is a passive adapter. It takes a single DMS-59 port on a workstation and splits it into two VGA (DB-15) female ports. The DMS-59 port is a dense, 59-pin connector found almost exclusively on older Dell Precision workstations and some HP Z-series desktops from around 2005–2012. It was designed to carry two independent VGA (or DVI, with different adapters) signals through one physical port.
The P574-001 does not convert anything. It does not support HDMI, DisplayPort, or DVI. It literally just “unbundles” the two analog VGA signals that the workstation is already outputting via its DMS-59 port. If your workstation doesn't have a DMS-59 port, this adapter is useless.
When This Adapter Saves the Day
Here's the exact scenario where the Tripp Lite P574-001 is the right tool:
- You have a legacy Dell Precision T3500, T5500, T7500 (or similar) with DMS-59.
- You need two separate VGA displays (mirrored or extended).
- You're on a tight budget and don't want to buy a modern GPU.
- Your monitors are VGA-only (common in industrial settings, security control rooms).
Everything I'd read about DMS-59 adapters said they were plug-and-play. In practice, I found that phrase misleading. They are plug-and-play if the workstation's BIOS and graphics driver support dual-analog output over DMS-59. Some Dell Precision workstations from 2007–2009 shipped with NVIDIA Quadro cards that only output a single VGA signal through DMS-59 unless you enable “dual mode” in the driver. The adapter works, but the output may mirror or fail to detect the second monitor if the driver isn't set correctly. So: plug-and-play after driver configuration.
When NOT to Use the P574-001 (Honest Limitations)
This is where most mistakes happen. Based on 200+ rush orders for video connectivity, here's when you should not buy the Tripp Lite P574-001:
- Your source is HDMI, DisplayPort, or USB-C. Wrong adapter entirely. You need an active converter (e.g., DisplayPort to VGA, HDMI to VGA).
- You need dual DVI or dual HDMI. The P574-001 is VGA only. For dual DVI from DMS-59, you need the Tripp Lite P576-001 or P578-001.
- Your monitors support digital input. If you can use DVI, HDMI, or DisplayPort, it's almost always better to avoid analog VGA. Picture quality is better and you skip one potential failure point.
- You're supporting a modern workstation (2013+). Very few modern workstations have DMS-59. If yours does, it's probably an older GPU that will bottleneck your monitoring software.
I wish I had tracked the number of times someone bought this adapter for a modern Dell with only DisplayPort outputs. What I can say anecdotally: roughly 30% of the returns I processed for “DMS-59 to VGA” products were from people who didn't check their source port. Don't be that person.
Cost and Availability (as of January 2025)
Based on Tripp Lite's product page and major distributors (Digi-Key, Amazon Business, CDW; quotes from January 2025):
The P574-001 typically costs $40–$55. Some third-party sellers have it for $30–$40, but verify authenticity — I've seen poorly molded knockoffs that break after 10 insertions. For comparison, an active DisplayPort to VGA adapter (which works with modern hardware) is about $15–$25. The P574-001's premium comes from its niche application, not from superior technology. (Verify current pricing; these are estimates from Q1 2025 distributor quotes.)
The Bottom Line (Literally)
The Tripp Lite P574-001 is a reliable, purpose-built adapter for a specific legacy scenario. If you have a Dell or HP workstation with a DMS-59 port and two VGA monitors, it's the correct solution. For anything else, you're overcomplicating the problem — and your IT team will thank you for using a standard HDMI or DisplayPort converter instead.
Recommendation: I recommend this for organizations maintaining legacy control room or warehouse setups with older Dell Precision workstations. If you're setting up a new deployment with modern hardware, skip this and budget $30 for two active VGA adapters instead.
