NVIDIA GeForce GT 640M vs NVIDIA GeForce GTX 680MX Mac Full Specs
384 Shaders 625MHz | 1,536 Shaders 719MHz |
1GB GDDR564GB/s | 2GB GDDR5160GB/s |
·· 480 GFLOPS | ·· 2.21 TFLOPS |
Form Factor Soldered | Form Factor Soldered |
TDP 32W | TDP 122W |
Clock Speed ·· | Clock Speed ·· |
Peak OPS 480 GFLOPSFP32 | Peak OPS 2.21 TFLOPSFP32 |
FP32 480 GFLOPS | FP32 2.21 TFLOPS |
FP64 20 GFLOPS | FP64 92.03 GFLOPS |
Pixel Rate 10 GPixel/s | Pixel Rate 23 GPixel/s |
Texture Rate 20 GTexel/s | Texture Rate 92 GTexel/s |
Shaders 384 Shaders | Shaders 1,536 Shaders |
TMUs 32 TMUs | TMUs 128 TMUs |
ROPs 16 ROPs | ROPs 32 ROPs |
SMs 2 SMs | SMs 8 SMs |
Boost Clock 625MHz | Boost Clock 719MHz |
L2 Cache 256KB shared | L2 Cache 512KB shared |
1GB GDDR5 | 2GB GDDR5 |
Memory Bus 128-bit | Memory Bus 256-bit |
Memory Speed 4GT/s | Memory Speed 5GT/s |
Memory Bandwidth 64GB/s | Memory Bandwidth 160GB/s |
ECC No | ECC No |
TDP 32W | TDP 122W |
Multi-Monitor 3 | Multi-Monitor 2 |
Encoder Model NVENC 1 | Encoder Model NVENC 1 |
Codec AVC (H.264) | Codec AVC (H.264) |
Decoder Model NVDEC 1 | Decoder Model NVDEC 1 |
Codec MPEG-1 MPEG-2 MPEG-4 VC-1 AVC (H.264) | Codec MPEG-1 MPEG-2 MPEG-4 VC-1 AVC (H.264) |
Form Factor Soldered | Form Factor Soldered |
Manufacturer | Manufacturer |
Chip Designer | Chip Designer |
Architecture | Architecture |
Family | Family |
Branding  | Branding |
Codename NVE7 | Codename NVE4 |
Chip Variant - | Chip Variant GK104-200-KD-A2 |
Market Segment Laptop | Market Segment Laptop |
Release Date Mar 22, 2012 | Release Date Oct 23, 2012 |
Foundry TSMC | Foundry TSMC |
Fabrication Node 28nm | Fabrication Node 28nm |
Die Size 118mm² | Die Size 294mm² |
Transistor Count 1.3 Billion | Transistor Count 3.5 Billion |
Transistor Density 10.76 MTr/mm² | Transistor Density 12.04 MTr/mm² |