GeForce 7800 GTX 512
The 512 MB version of the GeForce 7800 GTX was released on November 14, 2005. The card features more than simply an increased frame buffer from 256 MB to 512 MB. The card features a much improved core clock speed of 550 MHz vs. 430 MHz (27.9% increase) and fast 1.1 ns GDDR3 memory clocked at 1.7 GHz vs. 1.2 GHz (41.7% increase), when compared to the original version. Like ATI's X1800 XT, the addition of another 256 MB of memory, and to a lesser extent, the increased clock speeds, have raised the heat and power output significantly. To combat this, the GeForce 7800 GTX 512 sports a much larger yet quieter dual slot cooling solution when compared to the original 256 MB version.[15]
Performance Specs
Core Clock Speed: 550 MHz
Memory Interface: 256-bits
Memory Bandwidth: 54.4 GB/s
Fill Rate: 8.8 billion pixel/s, 13.2 billion texel/s
Vertex/s: 1100 millions
Shader Power: 24 pixels per clock
Memory Type: GDDR3
GeForce 7950 GT
On 14 September 2006 Nvidia released the 7950GT. Announced with a 550 MHz core clock, 700 MHz (1400 MHz effective) memory clock, 24 pixel shader units, standard configurations come equipped with both 512 MB GDDR3 memory and HDCP support. At an introductory price of US$300, the GeForce 7950 GT replaces the older GeForce 7900 GT and improves performance: the GeForce 7950 GT has a fillrate of 13,200 Megatexels/s and a memory bandwidth of 44.8 GB/s (versus 10800 Megatexels/s and 940 Megavertices/s for the 7900 GT).
Performance Specs
Memory Interface: 256-bits
Memory Bandwidth: 44.8 GB/s memory bandwidth
Fill Rate: 13.2 Billion pixel/s
Vertex/s: 1.1 Billion
Shader Power: 24 pixels per clock
SLI Support (PCI-E model only)
Memory Type: GDDR3
NOTE: XFX has developed and released AGP versions of this card. [24]
i use the 9800 myself:
On April 1, 2008 the GeForce 9800 GTX was officially launched. It was basically an 8800 GTS 512MB with two SLI connectors, higher clock speeds, and support for Nvidia Hybrid Power, a technology that allows the discrete GPU to shut off during non resource intensive applications, and instead use the integrated GPU. With these extra features though, a high price came too.
Taken from an eVGA specification sheet:[21]
128 Stream Processors.
Clocks (Core/Shader/Memory): 675 MHz/1688 MHz/2200 MHz
256-bit memory interface.
512 MB of GDDR3 memory.
70.4 GB/s memory bandwidth
Texture Fill Rate of 43.2 (billion/s).
DirectX 10, Shader Model 4.0, OpenGL 3.2, and PCI-Express 2.0.
Outputs include two DVI ports, an HDMI output(Using nVidia DVI to HDMI adapter(included)), and S/PDIF in connector on-board for routing audio through the HDMI cable
