1 PC Software Cheat: This is the "traditional" kind. The cheat program runs on the same computer as your game. It reads and writes to the game's memory directly from inside your operating system (like Windows). Because of this, it leaves traces that anti-cheat software is specifically designed to look for. It's like having a conversation in the same room – easier to be heard.
2 PC DMA (Direct Memory Access) Cheat: This setup uses a separate hardware device (PCIe card) plugged into gaming computer, while you still have second PC where all calculations/logic are done. This device can directly read the RAM of your gaming PC, without needing to install any software on it. The cheat runs entirely on the second PC. It's like reading a book over someone's shoulder from outside the window – you're not in the room, so you're much harder to notice.
Advantages of DMA (why people pay more for it):
Safer (Against Detection): This is the biggest advantage. Since no software is installed on your gaming PC, there are no files, processes, or drivers for the anti-cheat to scan and flag. It's working from the "outside," which is a much harder angle for game anti-cheats to defend against. It's generally considered the most undetectable method available to the public right now.
Extremely Stable: Because it's not injecting code or hijacking processes on your gaming PC, there's almost zero risk of causing the game to crash (unless the cheat itself is poorly coded). It's just reading memory.
On/Off: The DMA card can be just turned on/off by simple button "behind your computer".
Disadvantages of DMA:
Cost: It's way more expensive. You need a second computer, the DMA hardware itself, and the cheat subscription.
Yes, a DMA setup is generally considered more safe and stable from a detection standpoint.