GeForce 8800: Here Comes the DX10 Boom

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The GeForce 8800GTX can fill 64 textures per clock cycle, and at 575 MHz, it can serve up a maximum of 36.8 billion textures per second (GeForce 8800GTS = 32 billion/sec). The GeForce 8800GTX has 24 ROPs, and when running at a core frequency of 575 MHz, the card has a peak pixel throughput of 13.8 Gpixels/sec. Similarly, the GeForce880GTS version has 20 ROPs and therefore has a peak fill rate of 10 Gpixels/sec at 500 MHz.

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Nvidia GeForce Reference Specifications
Row 0 - Cell 0	8800GTX	8800GTS	7950GX2	7900GTX	7800GTX 512	7800GTX
Process Technology (nm)	90	90	90	90	110	110
Processor Core	G80	G80	G71	G71	G70	G70
Number of Processors	1	1	2	1	1	1
Number of Transistors per Processor (Millions)	681	681	278	278	302	302
Vertex Frequency (MHz)	1350	1200	500	700	550	470
Core Frequency (MHz)	575	500	500	650	550	430
Memory Clock (MHz)	900	600	600	800	850	600
DDR Rate (MHz)	1800	1200	1200	1600	1700	1200
Vertex Shaders (#)	128	96	16	8	8	8
Pixel Shaders (#)	128	96	48	24	24	24
ROPs (#)	24	20	32	16	16	16
Memory Interface (bit)	384	320	256	256	256	256
Frame Buffer Size per Processor (MB)	768	640	512	512	512	256
Memory Bandwidth (GB/sec) per processor	86.4	48	38.4	51.2	54.4	38.4
Vertices/Second (Millions)	10800	7200	2000	1400	1100	940
Pixel Fill Rate (# ROPs x clk) in Billions/sec	13.8	10	16	10.4	8.8	6.88
Texture Fill Rate (# pixel pipes x clk) in Billions/sec	36.8	32	24	15.6	13.2	10.32
RAMDACs (MHz)	400	400	400	400	400	400
Bus Technology	PCI Express	PCI Express	PCI Express	PCI Express	PCI Express	PCI Express

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If you were scratching your head at the memory bus width, here is your answer. From the core logic image on the previous page, you can see that six memory partitions exist on a GeForce 8800 GTX GPU. Each of these provides a 64-bit interface to memory, yielding a 384-bit combined interface width. The 768 MB of GDDR3 frame buffer memory is attached to a memory subsystem that utilizes a high-speed crossbar design, similar to GeForce 7x GPUs. This crossbar supports DDR1, DDR2, DDR3, GDDR3 and GDDR4 memory.

The GeForce 8800GTX uses GDDR3 memory, with a default clock speed of 900 MHz (GTS version is clocked at 800 MHz). With a 384-bit (48 byte-wide) memory interface running at 900 MHz (1800 MHz DDR data rate), frame buffer memory bandwidth is very high at 86.4 GB/sec. With 768 MB of frame buffer memory, far more complex models and textures can be supported at high resolutions and image quality settings.