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.
|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|
|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|
|TDP:||50 W||50 W||75 W||75 W||140 W|
|GeForce GT 630||GeForce GT 640||GeForce GT 645|
|Image Credit: VideoCardz|