AMD CrossFire Bridge Cable Overview | Generated by AI
Question: What is this AMD CROSS FIRE cable?
Answer:
This is an AMD CrossFire bridge cable (also called a CrossFire interconnect cable). It is a small physical link used to connect two AMD Radeon GPUs for multi-GPU rendering.
What it does
Older AMD Radeon cards had a small connector on the top edge of the GPU:
GPU 1 ===== CrossFire Bridge ===== GPU 2
The cable allows the two GPUs to exchange some rendering data directly.
Typical use cases:
- Gaming multi-GPU (CrossFire)
- Older professional workloads
- Some OpenCL workloads
Important: it is mostly obsolete now
Modern AMD GPUs generally do not use CrossFire bridges.
Examples:
| GPU | CrossFire bridge? |
|---|---|
| Radeon HD 7000 series | Yes |
| Radeon R9 280/290 | Usually yes (some use PCIe only) |
| Radeon RX 400/500 | Mostly no bridge, “XDMA” over PCIe |
| Radeon RX 5000/6000/7000 | No CrossFire support |
AMD abandoned CrossFire for gaming around the Vulkan/DX12 era because modern APIs allow the application itself to manage multiple GPUs.
Compared with NVIDIA SLI/NVLink
| AMD CrossFire | NVIDIA SLI | |
|---|---|---|
| Bridge | CrossFire cable | SLI bridge |
| Purpose | Multi-GPU rendering | Multi-GPU rendering |
| Modern support | Almost dead | Almost dead |
| AI training | No | No |
| VRAM pooling | No | No |
For AI/LLM work:
2 × RTX 3090
does not use SLI/NVLink for PyTorch training in most cases.
You normally use:
torch.distributed
DistributedDataParallel (DDP)
NCCL
The GPUs communicate through PCIe/NVLink automatically.
For your GPU experiments
Given your interest in RTX 3090 / Tesla / MI-series / multi-GPU training:
This cable is basically a collector item today. It has almost zero value unless you are restoring an old AMD gaming machine.
A dual AMD GPU setup like:
R9 290 + R9 290
HD 7970 + HD 7970
could use it, but a modern AI workstation would ignore it.
Generated by AI. Curating and sharing still takes effort.
If you find it useful, feel free to
donate.
WeChat: @lzwjava
·
X: @lzwjava ·
Say hi 👋