Radeon R400 series
| Release date | 2004–2005 |
|---|---|
| Codename | Loki |
| Architecture | Radeon R400 |
| Cards | |
| Entry-level | None |
| Mid-range | X700, X740 |
| High-end | X800 |
| Enthusiast | X850 |
| API support | |
| OpenGL | OpenGL 2.0 |
| History | |
| Predecessor | Radeon 9000 series Radeon X300 series Radeon X500 series Radeon X600 series |
| Successor | Radeon X1000 series |
| Support status | |
| Unsupported | |
The R420 GPU, developed by ATI Technologies, was the company's basis for its 3rd-generation DirectX 9.0/OpenGL 2.0-capable graphics cards. Used first on the Radeon X800, the R420 was produced on a 0.13 micrometer (130 nm) low-K photolithography process and used GDDR-3 memory. The chip was designed for AGP graphics cards.
Driver support of this core was discontinued as of Catalyst 9.4, and as a result there is no official Windows 7 support for any of the X700 - X850 products.