Radeon HD 2600XT GDDR4
Formally, the Radeon HD 2600 series consists of only two models - with the XT and Pro indices
However, in fact, ATI produced at least four modifications. Thus, the HD 2600 XT video card can be equipped with both GDDR3 and GDDR4 memory. Moreover, in the latter case, we have a completely different product, which differs in both design and clock frequencies:
Radeon HD 2600 XT DDR3: RV630 chip with a frequency of 800 MHz, 256 MB of GDDR3 memory with a frequency of 700 (1400) MHz;
Radeon HD 2600 XT DDR4: RV630 chip with a frequency of 800 MHz, 256 MB of GDDR4 memory with a frequency of 1100 (2200) MHz.
As you can see, the difference in memory frequency is huge - 400 MHz, or 63%
Characteristics of ATI Radeon HD 2600 XT GDDR4
| Name | Radeon HD 2600XT GDDR4 |
| Core | RV630 |
| Process technology (µm) | 0.065 |
| Transistors (millions) | 390 |
| Core frequency | 800 |
| Memory operating frequency (DDR) | 1100 (2200) |
| Bus and memory type | GDDR4 128 Bit |
| Bandwidth (Gb/s) | 35,2 |
| Unified shader units | 120 |
| Unified shader unit frequency | 800 |
| TMU on conveyor | 8 (allgo) |
| ROP | 4 |
| Textures per beat | 8 |
| Textures per pass | 8 |
| Shader Model | 4.0 |
| Fill Rate (Mpix/s) | 3200 |
| Fill Rate (Mtex/s) | 6400 |
| DirectX | 10.0 |
| Anti-Aliasing (Max) | MS-24x |
| Anisotropic Filtering (Max) | 16x Quality |
| Memory Capacity | 256/512 |
| Interface | PCI-E/AGP |
| RAMDAC | 2 x 400 |
The difference in performance of modifications with GDDR4 memory was not much different from the original.
