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If you’re looking for a low-profile AMD GPU for a small-form-factor desktop, the manufacturer-documented options here are specific Radeon RX 6400 and RX 550 boards. The RX 6400 examples use 4 GB of GDDR6; the RX 550 examples use 4 GB of GDDR5. Neither family name alone guarantees a fit: check the exact card’s half-height bracket, dimensions, thickness, power guidance, and display outputs against your PC before buying.
How the compared low-profile Radeon cards differ
This is a comparison of four documented board models, not an exhaustive market list or a current value ranking. Manufacturer specifications identify their hardware and fit-related details, but do not establish a controlled performance comparison.
| Exact model | Form and dimensions | Memory and interface | Power details published by maker | Display outputs |
|---|---|---|---|---|
| Gigabyte GV-R64D6-4GL Radeon RX 6400 D6 Low Profile 4G | Low profile; 182 × 69 × 36 mm. Low-profile bracket listed as an accessory. | 4 GB GDDR6; 64-bit; 128 GB/s. | No auxiliary connector is listed; Gigabyte recommends a 350 W PSU. | 1 × DisplayPort 1.4; 1 × HDMI 2.1. |
| ASRock RX 6400 Low Profile 4GB | Described as low profile; dimensions were not exposed in the cited specification extract. | 4 GB GDDR6; PCIe 4.0. | AMD specifies 53 W typical board power for the RX 6400; confirm the partner board and host-system requirements. | 1 × DisplayPort 1.4a; 1 × HDMI 2.1. |
| ASRock RX550 LP 4G | Low profile. ASRock’s overview gives 170 × 69 × 39 mm; its detailed dimension entry gives 169.58 × 69 × 42.05 mm. | 4 GB GDDR5; 128-bit; 6 Gbps; PCIe 3.0 x8. | No comparable explicit PSU recommendation was surfaced in the cited specification extract; confirm the exact board and PC requirements. | 1 × DisplayPort 1.4; 1 × HDMI 2.0. |
| MSI Radeon RX 550 4GT LP OC | Low profile; 170 × 68 × 38 mm. | 4 GB GDDR5; 128-bit. | MSI lists 50 W consumption and recommends a 400 W PSU in its datasheet generated March 30, 2023. | HDMI 2.0; DL-DVI-D. |
Specifications: Gigabyte GV-R64D6-4GL, ASRock RX 6400 Low Profile 4GB, ASRock RX550 LP 4G, and MSI Radeon RX 550 4GT LP OC.
RX 6400 or RX 550: what the specifications establish
RX 6400: newer GPU family, GDDR6 memory
AMD dates the RX 6400 launch to January 19, 2022. Its product specifications list up to 4 GB of GDDR6 memory on a 64-bit interface, 53 W typical board power for desktop use, PCIe-powered operation, and a recommended minimum 350 W PSU. These are GPU-level specifications; the partner board’s dimensions, bracket, and system guidance still matter. AMD Radeon RX 6400 specifications.
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Gigabyte’s GV-R64D6-4GL lists a boost clock up to 2321 MHz and a game clock of 2039 MHz. ASRock lists the same game and boost clocks for its RX 6400 Low Profile 4GB. These published clock figures do not establish how the cards compare in games or other workloads.
RX 550: two different low-profile board designs
The ASRock and MSI examples both have 4 GB of GDDR5, but they are not interchangeable board designs. They differ in listed dimensions and monitor connectors; the ASRock page also warns that its model may not be sold worldwide. That warning does not establish availability in any particular country.
Rank #2
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GDDR6 on the RX 6400 and GDDR5 on the RX 550 are specification differences, not proof of a particular real-world performance gap. No controlled head-to-head benchmark or specific performance percentage is established by these manufacturer pages.
Check physical fit before choosing a card
“Low profile” describes a physical form factor. A short card is not necessarily half-height, and a low-profile card can still be too long or thick for a particular OEM SFF case. Gigabyte lists its low-profile bracket as an accessory for the GV-R64D6-4GL; verify that the bracket is included with the item you are buying.
Rank #3
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- Confirm the bracket and slot height. Check the case’s half-height expansion opening and whether the exact card has a suitable low-profile bracket.
- Compare card dimensions with case clearance. Check length, height, and thickness, including whether the card or its cooler obstructs an adjacent slot. The two ASRock RX 550 dimension entries differ, so confirm the dimensions for the exact unit and revision.
- Check the power guidance against the PC. Note whether an auxiliary connector is listed and compare the maker’s PSU recommendation with the system’s supply. Recommendations do not guarantee that an OEM PSU, motherboard, or BIOS will support the card.
- Match outputs to your monitor. Confirm that the card has the connector your display needs, or that any adapter you plan to use supports the intended display mode.
- Check the host platform and available slot. Compare the listed PCIe interface with the PC’s slot and platform specifications, and ensure the slot is accessible in the case.
- Verify regional availability and price. Stock and pricing were not established here; check current local listings for the exact model number rather than relying on a family name.
Why “compact” does not necessarily mean low profile
MSI describes its RX 6400 AERO ITX as compact, but its published dimensions are 172 × 112 × 39 mm. Those dimensions do not establish half-height fit or a low-profile bracket. Consider it only if your case accepts its full bracket height; MSI’s cited page does not affirm low-profile compatibility. MSI Radeon RX 6400 AERO ITX specifications.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What these specifications cannot tell you
The cited manufacturer pages do not provide a controlled RX 6400-versus-RX 550 benchmark, a current street-price comparison, or a survey of live inventory. They also cannot confirm fit in a particular SFF desktop. Choose between the documented models by verifying the exact board’s physical clearance, power requirements, outputs, platform compatibility, and locally available price—not by assuming that all cards with the same GPU name share the same design.
Quick Recap
Best Value
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- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
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Rank #4
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