The HP EliteDesk 800 G4 (2016-2017) is a powerful business desktop featuring 7th generation Intel Core processors, DDR4-2400 memory support, and M.2 NVMe storage options. This generation marked HP’s first adoption of DDR4 memory and doubled maximum RAM capacity to 64GB.
This guide provides complete compatibility details for RAM upgrades, SSD installations, and power supply replacement for the EliteDesk 800 G4.
HP EliteDesk 800 G4 Specifications
| Specification | Detail |
|---|---|
| Release Year | 2016-2017 |
| Processor | Intel 7th Gen (Kaby Lake) — Core i3, i5, i7 |
| RAM Type | DDR4 UDIMM (standard, non-ECC) |
| RAM Speed | DDR4-2400 (native) |
| Maximum RAM | 64GB (4 × 16GB) |
| DIMM Slots | 4 (tower and SFF) |
| Slot Voltage | 1.2V standard |
| Storage Slots | M.2 NVMe support (PCIe 3.0) |
| Form Factors | SFF (Small Form Factor), Tower |
| PSU (Tower) | 240W, 320W |
RAM Upgrade Specifications
Memory Type & Speed
The EliteDesk 800 G4 requires DDR4-2400 memory, the native speed for 7th generation Intel processors. This was a significant upgrade from the G3’s DDR4-2133, offering 13% higher bandwidth.
Key compatibility notes:
- Use only standard DDR4 UDIMM modules (not ECC or registered)
- Native speed is DDR4-2400; faster speeds (DDR4-2666+) will throttle to 2400 MHz
- All modules must be 1.2V standard voltage — no low-voltage variants
- Install in pairs or sets of four for optimal dual-channel or quad-channel performance
- Mixing module speeds or capacities may reduce stability; use matching sets
Maximum Capacity & Configurations
The G4 supports 64GB maximum RAM across four DIMM slots. This was double the G3’s 32GB limit, making it suitable for heavier workloads and virtual machine environments.
| Configuration | Total Capacity | Module Specification | Channel Mode |
|---|---|---|---|
| Single 8GB | 8GB | 1× DDR4-2400 8GB | Single-channel |
| Pair (2×8GB) | 16GB | 2× DDR4-2400 8GB | Dual-channel |
| Quad (4×8GB) | 32GB | 4× DDR4-2400 8GB | Quad-channel |
| Quad (4×16GB) | 64GB | 4× DDR4-2400 16GB | Quad-channel maximum |
Recommended RAM for G4
Kingston Fury Beast DDR4-2400 8GB — Native G4 speed, proven reliability, excellent value.
Kingston Fury Beast DDR4-2400 16GB — For upgrading to 64GB with only four modules.
Corsair Vengeance LPX DDR4-2666 16GB — Faster alternative that works on G4 (throttles to 2400), forward-compatible.
G.Skill Trident Z DDR4-2400 16GB — Premium performance at native G4 speed.
Storage & SSD Compatibility
M.2 NVMe Support
The EliteDesk 800 G4 introduced support for M.2 NVMe SSDs (PCIe 3.0), offering dramatically faster speeds (3,500+ MB/s) compared to older SATA drives (550 MB/s). Most G4 boards include at least one M.2 NVMe slot.
Samsung 970 EVO 1TB — Excellent performance, widely trusted on G4 systems.
WD Blue SN570 1TB — Reliable, cost-effective, proven in businesses.
Crucial P1 1TB — Balanced performance and price, QLC technology.
Hybrid Storage Setup
Some G4 configurations support both M.2 NVMe and 2.5″ SATA SSD slots. This allows you to install the Windows OS on the fast NVMe drive and use SATA for bulk storage — a cost-effective approach.
Power Supply Information
Tower PSU Details
EliteDesk 800 G4 tower models ship with standard ATX power supplies:
- 240W PSU — Typical for i3/i5 configurations
- 320W PSU — Higher-spec i7 systems
Both use standard 24-pin ATX connectors and can be replaced with any desktop power supply. Upgrading to a higher-wattage PSU (400-550W) provides better efficiency and headroom for future components.
SFF Power Supplies
SFF (Small Form Factor) G4 models use specialized power supplies not compatible with tower units. Verify your form factor before purchasing a replacement PSU.
PSU Replacement Options
Seasonic Focus GX-550W 80+ Gold — Excellent efficiency, modular design, 12-year warranty.
EVGA SuperNOVA G2 650W — Proven reliability, modular, 80+ Gold certified.
G4 vs. G3 vs. G5 RAM Comparison
| Feature | G3 | G4 | G5 |
|---|---|---|---|
| Memory Type | DDR4 | DDR4 | DDR4 |
| Native Speed | DDR4-2133 | DDR4-2400 | DDR4-2666 |
| Max Capacity | 32GB | 64GB | 64GB |
| DIMM Slots | 4 | 4 | 4 |
| M.2 NVMe | No | Yes | Yes |
| Processor Gen | 6th Gen Intel | 7th Gen Intel | 9th Gen Intel |
Installation Instructions
- Power off the computer completely and disconnect the power cable
- Press the power button several times to discharge residual electricity
- Wait 30-60 seconds before opening the case
- Open the side panel (usually secured with 2-4 screws or a latch)
- Locate the DIMM slots (long, horizontal slots near the top of the motherboard)
- If replacing RAM, push the retention clips outward to eject the old modules
- Align the new module’s notch with the key on the slot
- Press down firmly on both ends until the retention clips snap into place
- Close the case and reconnect power
- Boot up — the BIOS will auto-detect and configure the new memory
Frequently Asked Questions
Q: Is the G4 still worth upgrading in 2026?
A: Yes, if you have a G4 and it’s still performing adequately. A RAM upgrade to 32GB or 64GB can extend its useful life by 3-5 years. However, if you need processor-level improvements or Thunderbolt 3 support, moving to a G6 or later is better.
Q: Can I use DDR4-2666 RAM in a G4?
A: Yes, it’s backward compatible. The DDR4-2666 modules will run at the G4’s native DDR4-2400 speed automatically. There’s no harm in using faster RAM — it just won’t achieve its full potential on the G4.
Q: How much faster is NVMe compared to SATA SSD?
A: NVMe (M.2) drives offer 3,500+ MB/s read speeds, while SATA SSDs max out at 550 MB/s — about 6x faster. For everyday computing, the difference is less noticeable, but for large file transfers or video editing, NVMe is significantly better.
Q: Do I need to update my BIOS after adding RAM?
A: No, you should not need to. The G4 BIOS automatically detects new RAM on boot. However, if you experience instability after adding RAM, checking for the latest BIOS update from HP’s support page is a good troubleshooting step.
Q: Is my G4 tower compatible with a 400W power supply upgrade?
A: Absolutely yes. As long as it’s a standard ATX PSU with 24-pin and 8-pin connectors, a 400-550W upgrade is safe and improves efficiency. Higher wattage provides better voltage regulation and fan efficiency at lower loads.
Q: Can the EliteDesk 800 G4 support dual NVMe drives?
A: Most G4 boards have only one M.2 slot, but some higher-end configurations may have two. Check your specific motherboard documentation. If your board has one M.2 slot, you can still add a 2.5″ SATA SSD for secondary storage.
Recommended Products
| Product | Type | Capacity | Link |
|---|---|---|---|
| Kingston Fury Beast DDR4-2400 | RAM | 8GB or 16GB | Shop |
| Corsair Vengeance LPX DDR4-2666 | RAM | 16GB | Shop |
| G.Skill Trident Z DDR4-2400 | RAM | 16GB | Shop |
| Samsung 970 EVO | NVMe SSD | 1TB | Shop |
| WD Blue SN570 | NVMe SSD | 1TB | Shop |
| Crucial P1 | NVMe SSD | 1TB | Shop |
| Seasonic Focus GX-550W | PSU | 550W | Shop |
| EVGA SuperNOVA G2 650W | PSU | 650W | Shop |
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Related Guides
- HP EliteDesk 800 All Generations Comparison
- HP EliteDesk 800 G6 Upgrade Guide
- HP EliteDesk 800 G5 Upgrade Guide
- HP EliteDesk 800 G3 Upgrade Guide
- Laptop RAM Compatibility Guide 2026