DMA Card 75T Guide
DMA 卡 75T 指南
This guide shows how to set up a 75T DMA card and fix the most common connection / speed issues.
本指南说明如何设置 75T DMA 卡，并修复最常见的连接或速度问题。
Need a card? You can buy it here:
需要 DMA 卡？你可以在这里购买：
https://vipercheats.com/product-category/dma-cards/
Recommended Hardware
推荐硬件
- Recommended USB cable — Purchase USB Cable
购买 USB 数据线 - Need more space in the case? — Purchase PCIe Extender
购买 PCIe 延长线 - No second PC? We recommend a
没有第二台电脑？我们推荐使用 Mini PC
迷你电脑 - Recommended OS — Windows 10 or Windows 11
DMA Card Installation
DMA 卡安装
- Download and keep the
下载并将 DMA Cheats folder
DMA Cheats 文件夹 on your Second PC.
保存在你的第二台电脑上。 - Only move the files to the Main PC that the instructions specifically say must run there.
只有教程明确要求在主电脑运行的文件，才移动到主电脑。 - Do not download or run DMA cheats on the Main PC.
不要在主电脑上下载或运行 DMA 辅助。
1) Power off your main PC and install the DMA card into an available PCI-Express slot (x1, x4, or x16) on the motherboard.
1）关闭主电脑电源，将 DMA 卡安装到主板可用的 PCI-Express 插槽（x1、x4 或 x16）中。
2) Connect the USB 3.0 cable to the DMA card’s data port.
3) Plug the other end of the cable into a USB 3.0 port on the second PC.
3）将数据线另一端插入第二台电脑的 USB 3.0 端口。
4) Power on the DMA card, then turn on both the main PC and the second PC.
4）给 DMA 卡通电，然后打开主电脑和第二台电脑。
5) On the second PC, run CH341SER.exe as administrator
5）在第二台电脑上以管理员身份运行 CH341SER.exe。
6) Select Install
6）选择 Install。
7) If you get “Driver Install Success!” then you did everything right so far.
7）如果看到“Driver Install Success!”，说明目前步骤正确。
8) On the second PC, open the DMA test folder and launch the RunMe file.
8）在第二台电脑上打开 DMA 测试文件夹，并启动 RunMe 文件。
< 60 MB/s — bad speed, you need to get a better USB Cable or try another USB 3.x Port
>= 100 MB/s — good speed
>= 150 MB/s — great speed
Video Manual
视频教程
Second PC doesn’t detect the DMA card
- Make sure the DMA card is powered ON (if your model has a switch).
确认 DMA 卡已开启（如果你的型号有开关）。 - Try a different PCIe slot (if available).
尝试更换 PCIe 插槽（如果可用）。 - Disconnect other PCIe devices (except the GPU) and test again.
断开其他 PCIe 设备（显卡除外）后再次测试。 - Disable Intel VT-d (or AMD IOMMU) in BIOS.
在 BIOS 中禁用 Intel VT-d（或 AMD IOMMU）。 - Try a different USB 3 cable and a different USB 3 port.
尝试更换 USB 3 数据线和 USB 3 端口。 - In BIOS → Advanced / PCIe settings, switch PCIe to Gen1 or Gen2.
- If nothing helps, test with another Second PC (or reinstall Windows on the Second PC).
如果仍无效，请用另一台第二电脑测试，或在第二台电脑上重装 Windows。
DMA Speed test failed
DMA 速度测试失败
If the device appears in Device Manager but the test won’t run, this video usually fixes it:
Low DMA speed test result
DMA 速度测试结果较低
- Try a different PCIe slot.
- Use a better USB 3 cable and try another USB 3 port.
- Make sure the Second PC is strong enough (CPU not older than ~7 years, and 12GB+ RAM).
- If the above doesn’t help, it may be firmware-related — ask the developer to replace it.
After installing firmware
安装固件后
- If speed test stops working after flashing firmware, do a cold boot:
如果刷入固件后速度测试无法工作，请执行冷启动： - Turn off the Main PC and cut power (switch off PSU or unplug the power cable).
关闭主电脑并断电（关闭电源开关或拔掉电源线）。 - Wait 30 seconds.
等待 30 秒。 - Reconnect the USB cable to the DATA port, restore power, and boot Main PC.
重新将 USB 线连接到 DATA 端口，恢复供电并启动主电脑。 - Run the DMA speed test again on the Second PC.
在第二台电脑上重新运行 DMA 速度测试。
Where to download?
在哪里下载？
You can download the DMA Cheats folder
DMA Cheats 文件夹 here:
https://vipercheats.com/download
