AMD Radeon R9 255 OEM vs ATI Radeon HD 4870
Processeur graphique
| Nom du GPU | Cape Verde | RV770 |
|---|---|---|
| GPU variant | Cape Verde PRX | RV770 XT (215-0669049) |
| Architecture | GCN 1.0 | TeraScale |
| Fonderie | TSMC | TSMC |
| Taille du processus | 28 nm | 55 nm |
| Transistors | 1,500 million | 956 million |
| Taille des matrices | 123 mm² | 256 mm² |
Carte graphique
| Date de publication | Dec 21st, 2013 | Jun 25th, 2008 |
|---|---|---|
| Génération | Volcanic Islands | Radeon R700 |
| Production | End-of-life | End-of-life |
| Bus interface | PCIe 3.0 x16 | PCIe 2.0 x16 |
| Prédécesseur | Sea Islands | Radeon R600 |
| Successeur | Pirate Islands | Evergreen |
| Prix de lancement | — | 299 USD |
| Critiques | — | 135 in our database |
Vitesse clock
| Base clock | 900 MHz | — |
|---|---|---|
| Boost clock | 930 MHz | — |
| Mémoire clock | 1150 MHz 4.6 Gbps effective | 900 MHz 3.6 Gbps effective |
| GPU clock | — | 750 MHz |
Mémoire
| Taille de la mémoire | 2 GB | 512 MB |
|---|---|---|
| Type de mémoire | GDDR5 | GDDR5 |
| Bus mémoire | 128 bit | 256 bit |
| Bande passante | 73.60 GB/s | 115.2 GB/s |
Render Config
| Shading units | 512 | 800 |
|---|---|---|
| TMUs | 32 | 40 |
| ROPs | 16 | 16 |
| Compute units | 8 | 10 |
| Cache L1 | 16 KB (per CU) | 16 KB (per CU) |
| Cache L2 | 256 KB | 256 KB |
Performance théorique
| Taux de pixel | 14.88 GPixel/s | 12.00 GPixel/s |
|---|---|---|
| Taux de texture | 29.76 GTexel/s | 30.00 GTexel/s |
| FP32 (float) performance | 952.3 GFLOPS | 1,200 GFLOPS |
| FP64 (double) performance | 59.52 GFLOPS (1:16) | 240.0 GFLOPS (1:5) |
Board Design
| Taille Slot | Dual-slot | Dual-slot |
|---|---|---|
| TDP | 65 W | 150 W |
| Suggestions pour le PSU | 250 W | 450 W |
| Sorties | No outputs | 2x DVI1x S-Video |
| Connecteurs de puissance | 1x 6-pin | 2x 6-pin |
| Board number | C750 | B507-31 |
| Longueur | — | 241 mm 9.5 inches |
| Taille | — | 111 mm 4.4 inches |
| Taille | — | 40 mm 1.6 inches |
Caractéristiques graphiques
| DirectX | 12 (11_1) | 10.1 (10_1) |
|---|---|---|
| OpenGL | 4.6 | 3.3 |
| OpenCL | 1.2 | 1.1 |
| Vulkan | 1.2 | — |
| Shader model | 5.1 | 4.1 |
