NVidia publishes details of GT 630, GT 640 and GT 645 OEM cards

Earlier this month NVidia quietly launched GT 605 and GT 620 OEM graphics cards. Both cards were based on one generation older technology, and they were re-brands of GT 530 and GT 520 Fermi cards. Continuing the trend of quiet launches and card re-branding, NVidia yesterday released details of GT 640 with three memory options, GT 630 and GT 645 GPUs, some of which are re-packaged GeForce GT 5xx products.

GeForce GT 630 has 384 CUDA cores, and comes with 875 MHz processor and graphics speeds. The card will be offered with 1 GB or 2 GB of DDR3 memory, clocked at 891 MHz. GT 640 with 128-bit DDR3 memory option has very similar specifications, except that the graphics is clocked a bit lower, at 797 MHz. Both cards have maximum rated power 50 Watt.

Another version of GT 640 with GDDR5 memory option will have the same number of cores as the GT 630, albeit it will feature 950 MHz GPU clock, and 1 or 2 GB of GDDR5 memory at 2.5 GHz. The card consumes up to 75 Watt of power.

The third version of GT 640 looks similar to GeForce GT 545 DDR3. The differences between these two cards are minor, such as 75 Watt vs 70 Watt maximum power, or 891 MHz vs up to 900 MHz memory clock speed. Like the GT 545, the GT 640 card with 192-bit DDR3 memory has 144 CUDA cores, 720 MHz GPU frequency, 17 Gigatexel/s fill rate and 43 GB/s memory bandwidth.

GT 645 OEM GPU is the second re-packaged Fermi product. This card has the same number of cores (288) as GeForce GTX 555, same 776 MHz graphics speed and 37.2 Gigatexel/s fill rate. Other similarities are 1 GB of GDDR5 memory, clocked at 1.914 GHz, and 91.9 GB/s memory bandwidth. Maximum power of the GT 645 was reduced by 10 Watt to 140 Watt, and the card now supports OpenGL 4.2.

Please see below for specifications of new NVidia cards:

GPU model	GT 630	GT 640 (128-bit DDR3)	GT 640 (192-bit DDR3)	GT 640 (GDDR5)	GT 645
CUDA cores	384	384	144	384	288
Graphics frequency (MHz)	875	797	720	950	776
GPU frequency (MHz)	875	797	1440	950	1552
Texture fill rate (Gigatexels/sec)	28	25.5	17	30.4	37.2
Memory frequency (MHz)	891	891	891	2500	1914
Memory size (GB)	1 or 2	1 or 2	1.5 or 3	1 or 2	1
Memory type	DDR3	DDR3	DDR3	GDDR5	GDDR5
Memory Interface width	128-bit	128-bit	192-bit	128-bit	128-bit
Memory bandwidth (GB/s)	28.5	28.5	43	80	91.9
OpenGL	4.2	4.2	4.2	4.2	4.2
Bus support	PCI-E 3.0	PCI-E 3.0	PCI-E 2.0	PCI-E 3.0	PCI-E 2.0
Maximum power (W)	50	50	75	75	140