NVIDIA GeForce GTX 660M Mac Edition vs NVIDIA GeForce GTX 850M
Graphics Processor
| GPU model | GK107 | GM107 |
|---|---|---|
| Architecture | Kepler | Maxwell |
| Foundry | TSMC | TSMC |
| Manufacturing process | 28 nm | 28 nm |
| Number of transistors | 1,270 million | 1,870 million |
| Die size | 118 mm² | 148 mm² |
| GPU variant | — | N15P-GT-A1 |
Mobile graphics
| Release date | Apr 1st, 2013 | Mar 12th, 2014 |
|---|---|---|
| Generation | GeForce 600M | GeForce 800M |
| Production | End-of-life | End-of-life |
| Interface | MXM-B (3.0) | PCIe 3.0 x16 |
| Predecessor | GeForce 500M | GeForce 700M |
| Successor | GeForce 700M | GeForce 900M |
Clocks
| GPU clock | 950 MHz | 902 MHz |
|---|---|---|
| Memory clock | 1250 MHz 5 Gbps effective | 1001 MHz 2 Gbps effective |
Memory Configuration
| Memory size | 512 MB | 2 GB |
|---|---|---|
| Memory type | GDDR5 | DDR3 |
| Memory bus width | 128 bit | 128 bit |
| Bandwidth | 80.00 GB/s | 32.03 GB/s |
Render Configuration
| Shading units | 384 | 640 |
|---|---|---|
| TMUs | 32 | 40 |
| ROPs | 16 | 16 |
| SMX count | 2 | — |
| Cache L1 | 16 KB (per SMX) | 64 KB (per SMM) |
| Cache L2 | 256 KB | 2 MB |
| SMM count | — | 5 |
Performance
| Pixel rate | 7.600 GPixel/s | 14.43 GPixel/s |
|---|---|---|
| Texture rate | 30.40 GTexel/s | 36.08 GTexel/s |
| FP32 (float) performance | 729.6 GFLOPS | 1,155 GFLOPS |
| FP64 (double) performance | 30.40 GFLOPS (1:24) | 36.08 GFLOPS (1:32) |
Dimensions & Outputs
| Slot width | MXM Module | IGP |
|---|---|---|
| TDP | 50 W | 45 W |
| Outputs | No outputs | No outputs |
| Power connectors | None | — |
API Support & Features
| DirectX | 12 (11_0) | 12 (11_0) |
|---|---|---|
| OpenGL | 4.6 | 4.6 |
| OpenCL | 3.0 | 3.0 |
| Vulkan | 1.1 | 1.1 |
| CUDA | 3.0 | 5.0 |
| Shader model | 5.1 | 5.1 |
