Nvidia has released five new GeForce cards under the 600 series, which are designated for OEMs only. There still is no official word from Nvidia on when the Kepler-based GK107 cards are expected for the desktop (though we should expect them here in the near future).
The top card, the GeForce GT 645, is a re-branding of the recently released Fermi-based GF114 GeForce GTX 560 SE. The other Fermi-based card is one of three GeForce GT 640 cards. It is based on the Fermi GF116, which features 144 CUDA cores, 1.5 GB or 3 GB GDDR3 192-bit memory interface, 720 MHz core clock speed, and 891 MHz memory clock speed.
There are three Kepler-based GK107 graphics cards, which all feature 384 CUDA cores, 24 TMUs and 16 ROPs. The two GeForce GT 640s differ in core clocks, memory, and TDP. At the high-end, the GT 640 has a core clock speed of 950 MHz, with the low-end running at 797 MHz. The memory clocks come in at 2500 MHz (GDDR5) and 891 MHz (GDDR3) respectively. The cards offer TDP of 75 W and 50 W.
One of the more interesting cards of the bunch is the GeForce GT 630. It is a single-slot, low-profile graphics card with 384 CUDA cores, 128-bit wide GDDR3 memory interface, 875 MHz GPU clock speed, 891 MHz memory clock speed and TDP of 50 W. When compared against the low-end GT 640, the GT 630 is actually the better card and in-turn will offer users better performance in their OEM system.
Specifications:
| Header Cell - Column 0 | GeForce GT 630 | GeForce GT 640 | GeForce GT 640 | GeForce GT 640 | GeForce GT 645 |
|---|---|---|---|---|---|
| Architecture | Kepler GK107 | Kepler GK107 | Fermi GF116 | Kepler GK107 | Fermi GF114 |
| CUDA Cores: | 384 | 384 | 144 | 384 | 288 |
| Core Clock: | 875 MHz | 797 MHz | 720 MHz | 950 MHz | 776 MHz |
| Shaders Clock: | 875 MHz | 797 MHz | 1440 MHz | 950 MHz | 1552 MHz |
| Memory Clock: | 891 MHz | 891 MHz | 891 MHz | 2500 MHz | 1914 MHz |
| Memory Type: | 1 or 2GB GDDR3 128-bit | 1 or 2GB GDDR3 128-bit | 1.5 or 3GB GDDR3 192-bit | 1 or 2GB GDDR5 128-bit | 1GB GDDR5 128-bit |
| Memory Bandwidth | 28.5 GB/s | 28.4 GB/s | 43 GB/s | 80 GB/s | 91.9 GB/s |
| Open GL: | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 |
| PCI-Express: | 3 | 3 | 3 | 3 | 2 |
| DirectX: | 11 | 11 | 11 | 11 | 11 |
| TDP: | 50 W | 50 W | 75 W | 75 W | 140 W |
| GeForce GT 630 | GeForce GT 640 | GeForce GT 645 |
|---|---|---|
| Image Credit: VideoCardz | ||
