diff --git a/docs/gpu-setup-research.md b/docs/gpu-setup-research.md
index acafb52..0be7d0d 100644
--- a/docs/gpu-setup-research.md
+++ b/docs/gpu-setup-research.md
@@ -320,12 +320,110 @@ watch -n 0.5 nvidia-smi
 
 **Phase 2 — Add second card + NVLink ($450)**
 1. Buy matching Quadro RTX 5000 — ~$400
-2. Buy NVLink HB Bridge 3-slot (part: P4934 / 1JF3K / 6FY12AA) — ~$50
+2. Buy NVLink HB Bridge 2-slot (part: P4934 / 1JF3K / 6FY12AA) — ~$50
 3. Install second card in adjacent/nearby x16 slot
 4. Connect NVLink bridge
 5. Verify with `nvidia-smi nvlink --status`
 6. Now running 32GB unified — Qwen3.5-35B-A3B at Q4_K_M with full 262K context
 
+### Dell R720/R730 Installation Guide
+
+#### Prerequisites (MUST HAVE before buying GPUs)
+
+| Requirement | R720 | R730 | Why |
+|-------------|-------|-------|-----|
+| **Dual CPUs** | Required | Required | GPU riser slots are wired to CPU2 — dead without it |
+| **2x 1100W PSUs** | Required | Required | 2x 230W GPUs + system = ~600W+ under load |
+| **GPU Riser 3** | Required for 2nd GPU | Required for GPUs | Provides the PCIe x16 slot + 8-pin power |
+| **GPU Power Cable** | Required | Required | Riser-to-GPU power, not included by default |
+| **Low-Profile Heatsinks** | Must swap (part of enablement kit) | Usually pre-installed | Standard heatsinks block GPU riser clearance |
+| **Max ambient temp** | 30°C (not the usual 35°C) | 30°C | High GPU TDP restricts cooling headroom |
+
+#### Shopping List: Dell-Specific Parts
+
+| Part | Dell P/N | What It Is | Price | Where |
+|------|----------|------------|-------|-------|
+| **GPU Power Cable** | **9H6FV** (09H6FV) | 8-pin EPS (riser) → 6-pin + 6+2-pin PCIe. One cable powers one GPU | ~$10-15 | Amazon, eBay |
+| **GPU Power Cable (alt)** | **N08NH** (0N08NH) | Same function, alternate Dell part number | ~$10-15 | Amazon, eBay |
+| **GPU Riser 3** (R720) | Check eBay for "R720 riser 3" or "R720 GPU riser" | Second riser card that provides GPU-capable x16 slot | ~$15-30 | eBay |
+| **GPU Riser 3** (R730) | Check eBay for "R730 riser 3" or "R730 GPU riser" | R730 version — NOT interchangeable with R720 | ~$15-30 | eBay |
+| **Low-Profile Heatsinks** (R720 only) | Part of original GPU enablement kit | Shorter heatsinks that clear the GPU riser. Search "R720 low profile heatsink" | ~$10-20/pair | eBay |
+
+**You need 2x power cables** (one per GPU). Search Amazon for "Dell R720 R730 GPU power cable 9H6FV" — multiple sellers (COMeap, ZAHARA, BestParts) stock them for ~$10-15 each.
+
+#### How It Fits
+
+```
+Dell R720/R730 Riser Layout (rear view):
+┌─────────────────────────────────────┐
+│  Riser 1          Riser 2    Riser 3│
+│  (network/        (GPU 1)    (GPU 2)│
+│   storage)        PCIe x16   PCIe x16│
+│                   Gen2(720)  Gen2(720)│
+│                   Gen3(730)  Gen3(730)│
+└─────────────────────────────────────┘
+         ↑ RTX 5000 ↑    ↑ RTX 5000 ↑
+              └── NVLink Bridge ──┘
+```
+
+- Both GPUs sit on **adjacent risers** (Riser 2 + Riser 3) — this is 2-slot spacing
+- The **2-slot NVLink bridge** (P4934) is the correct size for R720/R730
+- The cards mount **vertically** via risers, parallel to each other
+- NVLink bridge connects across the top of both cards
+
+#### R720 vs R730
+
+| Feature | R720 | R730 |
+|---------|------|------|
+| **PCIe** | Gen2 x16 | **Gen3 x16** |
+| **Impact on LLM** | None — VRAM-bound | None — VRAM-bound |
+| **Impact on NVLink** | None — NVLink bypasses PCIe | None — NVLink bypasses PCIe |
+| **GPU power delivery** | Same 8-pin from riser | Same 8-pin from riser |
+| **Heatsink swap** | Usually required | Usually already low-profile |
+| **Used price** | ~$100-150 cheaper | Preferred if budget allows |
+| **Recommendation** | Fine if you already have one | **Buy this one** if shopping new |
+
+#### Potential Issues
+
+1. **NVLink bridge clearance in 2U** — The bridge sits on top of both GPUs. In a 2U chassis
+   this is tight. The R720/R730 riser design mounts cards vertically which actually helps —
+   the bridge faces the chassis side panel, not the lid. Should fit, but measure before buying.
+
+2. **Blower fan noise** — The RTX 5000 has an active blower (unlike passive Tesla cards).
+   The server's own fans may spin higher to compensate. The blower exhausts out the bracket
+   which is correct for rack airflow.
+
+3. **"Unsupported" GPU warning** — Dell officially supports Tesla/Quadro cards from their era.
+   The Quadro RTX 5000 is a later generation than R720/R730 was designed for, but community
+   reports confirm Quadro RTX and even consumer RTX cards work fine. You won't get Dell support
+   if something goes wrong, but electrically it's standard PCIe.
+
+4. **CPU TDP limit** — Dell requires CPUs of 115W or less when GPUs are installed (R720).
+   Check your CPU model. Most common Xeon E5-2600 v1/v2 (R720) and E5-2600 v3/v4 (R730)
+   processors are within this range, but some high-core-count variants exceed it.
+
+5. **PSU mode** — With dual 300W GPUs, set PSU configuration to **non-redundant mode**
+   to use combined wattage from both PSUs. In redundant mode, you're limited to one PSU's
+   capacity (1100W) which may not be enough under full GPU + CPU load.
+
+#### Complete R720/R730 Shopping List
+
+```
+GPUS + NVLINK
+  2x  Quadro RTX 5000                              ~$800
+  1x  NVLink Bridge 2-slot (P4934 / L55997-001)    ~$50
+
+DELL-SPECIFIC PARTS
+  2x  GPU Power Cable (9H6FV or N08NH)             ~$25
+  1x  GPU Riser 3 (match your server model!)       ~$20
+  2x  Low-Profile Heatsinks (R720 only)            ~$15
+
+POWER (if not already installed)
+  2x  Dell 1100W PSU                               ~$30-50 ea
+
+TOTAL (assuming you have the server + dual CPUs)    ~$940-960
+```
+
 ## 24GB GPU Options (Previous Research — Still Valid for Tighter Budgets)
 
 | GPU | VRAM | Price Range | Best Deals | Notes |