ASUS Hyper M.2 X16 PCIe 4.0 X4 Expansion Card Supports 4 NVMe M.2 (2242/2260/2280/22110) up to 256Gbps for AMD 3rd Ryzen sTRX40, AM4 Socket and Intel VROC NVMe Raid
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AI Verdict
A cheap, massive aluminum heatsink for four NVMe drives that works flawlessly if your high-end motherboard supports x4/x4/x4/x4 bifurcation, but causes endless headaches on standard consumer boards.
This card is a dumb adapter, meaning your motherboard does all the heavy lifting. It offers incredible value for Threadripper or server boards with abundant PCIe lanes, but acts as a frustrating trap for standard AM4/LGA1700 users who do not realize their second PCIe slot is physically capped at x8 or x4.
If your motherboard lacks x4/x4/x4/x4 bifurcation support, you need an active NVMe adapter with a PLX switch chip, which usually costs over $200.
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Critically weak dimension
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Pros
- Massive aluminum heatsink and integrated blower fan keep four Gen 4 drives from thermal throttling under heavy load
- Delivers up to 256Gbps total bandwidth if your motherboard supports full PCIe 4.0 x16 bifurcation
- Physical switch on the rear bracket lets you turn off the blower fan for a silent build
- Provides up to 14W of power per slot to handle power-hungry Gen 4 and enterprise NVMe drives
- Costs a fraction of the price of active PCIe switch cards like those from HighPoint
Cons
- Lacks a built-in PLX chip, meaning it relies 100% on your motherboard BIOS for PCIe bifurcation
- Plugging this into a standard X570 or B550 second PCIe slot usually only detects one or two drives, not four
- Takes up a full x16 slot, which forces you to run your primary GPU at x8 speeds on consumer platforms
- The blower fan uses a proprietary connector, making it nearly impossible to replace if the bearing dies
Dimension Scores
Supports up to 14W per drive, easily handling the hottest Gen 4 SSDs without crashing.
Includes a massive aluminum heatsink and a physical fan switch, but lacks an active PLX chip for universal compatibility.
Holds four drives up to 22110 size, but demands a full x16 slot to function properly.
Relies entirely on the motherboard's BIOS bifurcation support, which is often poorly documented by board makers.
Best For
- Threadripper (sTRX40) or Intel HEDT builds with plenty of spare CPU PCIe lanes
- TrueNAS or Unraid home servers built on server-grade motherboards that explicitly support x4/x4/x4/x4 bifurcation
- Video editors needing a massive, cheap NVMe RAID 0 scratch disk and willing to sacrifice GPU lanes
Not Recommended For
- Standard gaming PC builds where the GPU needs the primary x16 slot
- Motherboards that only support x8/x8 bifurcation (you will only see two drives)
- Users expecting a plug-and-play experience without digging into BIOS settings
Watch Out For
- No built-in PCIe switch — if your motherboard BIOS lacks a specific x4/x4/x4/x4 bifurcation setting for the slot you use, you will only see one drive.
- Consumer motherboard limitations — on most AM4 boards, putting this in the second x16 slot limits you to two drives max because the slot is physically wired for x8.
- Drive population order matters — Asus documentation requires populating slots in a specific 1-3-4-2 sequence for certain RAID setups, confusing users who just go 1-2-3-4.
- The thermal pads are pre-applied to a single massive heatsink block, making it annoying to swap out just one drive later without messing up the pads for the others.
Full Specifications
| ASIN | B084HMHGSP |
| Brand | ASUS |
| Color | Gen 4 (PCIe 4.0) |
| Style | Music |
| Series | HYPER M.2 X16 GEN 4 CARD |
| Item Weight | 1.95 pounds |
| Manufacturer | ASUS |
| Operating System | Windows, macOS, Linux |
| Item model number | HYPER M.2 X16 GEN 4 Card |
| Hardware Interface | PCI Express 4.0 |
| Product Dimensions | 10.63 x 4.8 x 0.6 inches |
| Graphics Coprocessor | AMD 3rd Ryzen sTRX40 |
| Item Dimensions LxWxH | 10.63 x 4.8 x 0.6 inches |
What Buyers Say
The Asus Hyper M.2 V4 is the most misunderstood piece of hardware on Amazon. Buyers constantly leave 1-star reviews because only one drive shows up, completely unaware that their motherboard lacks the required PCIe bifurcation. For those with Threadripper or server boards, the card is praised as a heavy, premium-feeling piece of kit that keeps four Gen 4 drives ice cold under heavy RAID 0 loads. The physical fan switch on the rear bracket is a massive hit for silent PC builders. Just be prepared to fight your BIOS settings for an hour to get it working.
“Bought this to add 4 drives to my B550 board and only 1 showed up, spent 3 hours in bios before realizing I need a $300 threadripper board to actually use all 4 slots. The card itself is built like a tank though.”
Common Praise
- The aluminum heatsink is massive and feels like a premium graphics card
- Keeps four Gen 4 drives well below thermal throttling limits even during massive file transfers
- The physical fan on/off switch on the rear IO bracket is incredibly convenient
- Unbeatable price compared to active PLX switch cards
Common Complaints
- Only one or two drives show up on standard consumer motherboards
- Requires stealing the primary x16 slot from the GPU to see all four drives on AM4
- The thermal pads stick aggressively to the drives, making removal terrifying
- Asus's documentation on motherboard compatibility is confusing and hard to find
Ownership Tips
- The blower fan develops a high-pitched whine after a few months of 24/7 use
- If you populate less than four drives, you have to follow the specific 1-3-4-2 slot order or the RAID array might fail to initialize
- Updating your motherboard BIOS will often reset the bifurcation settings, causing your drives to suddenly disappear until you change it back
- The card is heavy enough that it can cause GPU-style sag if your PCIe slot isn't reinforced
Frequently Asked Questions
Why is only one of my four drives showing up in Windows?
Your motherboard is treating the card as a single x16 device. You need to go into your BIOS and change the PCIe slot configuration from 'Auto' to 'x4/x4/x4/x4' bifurcation.
Can I use this in the second PCIe slot on my X570 motherboard?
Yes, but you will likely only see two drives. Most consumer X570 boards split the CPU lanes to x8/x8, meaning the second slot only has enough lanes to read two x4 NVMe drives.
Does this card support hardware RAID?
No. It is a passive adapter. You have to use software RAID like Windows Storage Spaces, TrueNAS, or AMD RAIDXpert to pool the drives together.
Will this work with PCIe 3.0 drives and motherboards?
Yes, it is fully backwards compatible with PCIe 3.0, but your maximum bandwidth drops from 256Gbps to 128Gbps.
Is the built-in fan loud?
It whines at full speed, but there is a physical button on the back of the card to turn the fan off completely if your case has good airflow.
Buying Guide
Before you even look at the 'Buy' button, you must check your motherboard manual for a word called 'bifurcation'. This card is essentially a dumb piece of metal that wires four M.2 slots directly to your motherboard's PCIe slot. If your motherboard cannot split that slot into four separate x4 channels (x4/x4/x4/x4), this card will not work as advertised. If you are building a standard gaming PC, you probably lack enough PCIe lanes to run this and a graphics card at full speed.
PCIe Bifurcation
Think of a PCIe x16 slot as a 16-lane highway. Bifurcation is the traffic cop that splits it into four 4-lane roads so four separate SSDs can drive on it at once. Without it, only one SSD gets to use the highway.
No PLX / PCIe Switch
Active cards have a built-in chip that manages the traffic for you, letting them work on any motherboard. This card skips that chip to save you $150, forcing your motherboard to do the traffic management.
14W Power Support
Gen 4 NVMe drives pull a lot of electricity and get incredibly hot. This card provides enough juice so high-end drives do not crash under heavy load.
Alternatives
If your motherboard lacks x4/x4/x4/x4 bifurcation support, search for an 'Active NVMe PCIe Switch Card' or 'NVMe adapter with PLX chip' — but expect to pay over $200.
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