This article covers 玄人志向 AMD Radeon RX 6400 搭載 グラフィックボード 4GB ロープロファイル 【国内正規品】 RD-RX6400-E4GB/LP.

Overview

Kuroutoshikou's RD-RX6400-E4GB/LP is a low-profile graphics card built around the AMD Radeon RX 6400 GPU. It packs 4GB of GDDR6 memory and a boost clock of 2321MHz, all within a compact board that fits slim desktops and small-form-factor cases. The card draws power entirely from the PCIe slot, so no auxiliary power connector is required.
This is an entry-level product aimed at light gaming, video playback, and adding extra display outputs to an existing office PC. With a TDP of just 53W, it is also a sensible choice for systems with modest power supplies. HDMI and DisplayPort outputs allow for a multi-monitor setup without much hassle.
In the current GPU market, this card sits firmly in the budget tier. It is not designed for demanding AAA titles at high settings, but rather for users who want a simple, low-power upgrade path from integrated graphics.

Compatibility Guide

The low-profile form factor is the key compatibility feature here. It fits slim desktops and compact cube cases where a full-height card would not. You may need to swap the bracket depending on your case, but the low-profile design is the whole point of this product.
Because the card draws all its power from the PCIe slot, it works with power supplies that lack 6-pin or 8-pin PCIe auxiliary connectors. This makes it a practical drop-in upgrade for pre-built office PCs with modest power units.
The recommended PSU wattage is 250W. That figure assumes a typical system with this card installed; if you pair it with a power-hungry CPU or many peripherals, a slightly larger power supply would give you more headroom.

Product Info

This card was released on April 22, 2022, and is sold as a domestic authorized product in Japan. It is available through major retailers such as online retailers at a price point typical for entry-level graphics cards.
The GPU is an AMD Radeon RX 6400 with a boost clock of 2321MHz and a TDP of 53W. The 4GB GDDR6 memory runs on a 64-bit bus. These are modest specs, but they are well matched to the card's intended role as a low-power, space-saving solution.
In terms of market positioning, this is an entry-tier product. It costs less than mid-range and high-end cards, and it targets users who want basic 3D acceleration and multi-display support without overhauling their power supply or case.

Best Use Cases

  • Users with slim desktops or small-form-factor cases who want to step up from integrated graphics. The low-profile design and slot-only power make installation straightforward. This is not the card for someone chasing high frame rates in modern AAA games.
  • People who want smoother video playback, browser games, or light online titles on a daily-use PC. The 4GB GDDR6 memory and low power draw add graphics capability without requiring a PSU upgrade. Heavy video editing or 3D rendering workloads are beyond its scope.
  • Anyone with a pre-built PC that lacks auxiliary PCIe power connectors and wants extra display outputs. HDMI and DisplayPort support makes multi-monitor setups easy. Gamers planning a high-end rig will find this card underwhelming.

Things to Consider

This is an entry-level GPU, so it will struggle with modern 3D games at high settings and high resolutions. Its intended role is light gaming, video playback, and office display output, not hardcore gaming.
The 4GB memory capacity and 64-bit bus are modest. Texture-heavy recent titles may exceed the memory limit, so if gaming is your priority, you should look at a higher-tier card instead.
Even though it is low-profile, the card is about 152mm long. Check your case's internal clearance before buying. Also note that the card uses a PCIe 4.0 x4 interface, which could affect performance depending on your motherboard's configuration.

FAQ

Q: Does this card really not need auxiliary power?
A: Correct. The TDP is 53W, and the card draws all its power from the PCIe slot. It works with power supplies that have no 6-pin or 8-pin PCIe connectors.
Q: Can I use this low-profile card in a standard-size case?
A: Yes. Low-profile cards work fine in full-height cases as well. By swapping the included bracket, you can also fit it into slim cases.
Q: Is 4K video playback smooth on this card?
A: For video playback, yes. The GPU can handle 4K video streams smoothly. However, 4K gaming is not what this card is designed for.

Product Disclosure (Amazon)

  • Manufacturer: 玄人志向
  • Model: RD-RX6400-E4GB/LP
  • ASIN: B09YXLN6HJ
  • Note: This article covers a manufacturer-made product based on Amazon listing details.