ATI Radeon HD 4850 X2 vs NVIDIA GeForce GT 645M
Graphics Processor
| GPU model | R700 | GK107 |
|---|---|---|
| GPU variant | R700 PRO (215-0669065) | N13P-GS |
| Architecture | TeraScale | Kepler |
| Foundry | TSMC | TSMC |
| Manufacturing process | 55 nm | 28 nm |
| Number of transistors | 956 million | 1,270 million |
| Die size | 256 mm² | 118 mm² |
Graphics Card
| Release date | Nov 7th, 2008 | — |
|---|---|---|
| Generation | Radeon R700 | — |
| Production | End-of-life | — |
| Launch price | 420 USD | — |
| Interface | PCIe 2.0 x16 | — |
| Reviews | 26 in our database | — |
| Predecessor | Radeon R600 | — |
| Successor | Evergreen | — |
Clocks
| GPU clock | 625 MHz | 709 MHz |
|---|---|---|
| Memory clock | 995 MHz 1990 Mbps effective | 900 MHz 1800 Mbps effective |
Memory Configuration
| Memory size | 512 MB | 2 GB |
|---|---|---|
| Memory type | GDDR3 | DDR3 |
| Memory bus width | 256 bit | 128 bit |
| Bandwidth | 63.68 GB/s | 28.80 GB/s |
Render Configuration
| Shading units | 800 | 384 |
|---|---|---|
| TMUs | 40 | 32 |
| ROPs | 16 | 16 |
| Compute units | 10 | — |
| Cache L1 | 16 KB (per CU) | 16 KB (per SMX) |
| Cache L2 | 256 KB | 256 KB |
| SMX count | — | 2 |
Performance
| Pixel rate | 10.00 GPixel/s | 5.672 GPixel/s |
|---|---|---|
| Texture rate | 25.00 GTexel/s | 22.69 GTexel/s |
| FP32 (float) performance | 1,000 GFLOPS | 544.5 GFLOPS |
| FP64 (double) performance | 200.0 GFLOPS (1:5) | 22.69 GFLOPS (1:24) |
Dimensions & Outputs
| Slot width | Dual-slot | — |
|---|---|---|
| Length | 267 mm 10.5 inches | — |
| TDP | 250 W | 32 W |
| Suggested PSU | 600 W | — |
| Outputs | 4x DVI1x S-Video | No outputs |
| Power connectors | 1x 6-pin + 1x 8-pin | — |
| Board number | B501 | — |
API Support & Features
| DirectX | 10.1 (10_1) | 12 (11_0) |
|---|---|---|
| OpenGL | 3.3 | 4.6 |
| OpenCL | 1.1 | 3.0 |
| Vulkan | — | 1.1 |
| Shader model | 4.1 | 5.1 |
| CUDA | — | 3.0 |
Other Features
Mobile graphics
| Release date | — | Oct 1st, 2012 |
|---|---|---|
| Generation | — | GeForce 600M |
| Production | — | End-of-life |
| Interface | — | PCIe 3.0 x16 |
| Predecessor | — | GeForce 500M |
| Successor | — | GeForce 700M |
