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NVIDIA GeForce 8800 GTS 640

Graphics Processor
640 MB
Memory Size
Memory Type
320 bit
Bus Width
NVIDIA GeForce 8800 GTS 640 Image NVIDIA G80 Image
The GeForce 8800 GTS 640 was a high-end graphics card by NVIDIA, launched in November 2006. Built on the 90 nm process, and based on the G80 graphics processor, in its G80-100-K0-A2 variant, the card supports DirectX 10.0. The G80 graphics processor is a large chip with a die area of 484 mm² and 681 million transistors. Unlike the fully unlocked GeForce 8800 GTX, which uses the same GPU but has all 128 shaders enabled, NVIDIA has disabled some shading units on the GeForce 8800 GTS 640 to reach the product's target shader count. It features 96 shading units, 24 texture mapping units and 20 ROPs. NVIDIA has placed 640 MB GDDR3 memory on the card, which are connected using a 320-bit memory interface. The GPU is operating at a frequency of 513 MHz, memory is running at 792 MHz.
We recommend the NVIDIA GeForce 8800 GTS 640 for gaming with highest details at resolutions up to, and including, 1280x720.
Being a dual-slot card, the NVIDIA GeForce 8800 GTS 640 draws power from 1x 6-pin power connectors, with power draw rated at 143 W maximum. Display outputs include: 2x DVI, 1x S-Video. GeForce 8800 GTS 640 is connected to the rest of the system using a PCIe 1.0 x16 interface. The card measures 267 mm in length, and features a dual-slot cooling solution. Its price at launch was 449 US Dollars.

Graphics Processor

GPU Name: G80
GPU Variant: G80-100-K0-A2
Architecture: Tesla
Process Size: 90 nm
Transistors: 681 million
Die Size: 484 mm²

Graphics Card

Released: Nov 8th, 2006
Production Status: End-of-life
Launch Price: 449 USD
Bus Interface: PCIe 1.0 x16

Clock Speeds

GPU Clock: 513 MHz
Shader Clock: 1188 MHz
Memory Clock: 792 MHz
1584 MHz effective


Memory Size: 640 MB
Memory Type: GDDR3
Memory Bus: 320 bit
Bandwidth: 63.4 GB/s

Render Config

Shading Units: 96
TMUs: 24
ROPs: 20
SM Count: 6
Pixel Rate: 10.26 GPixel/s
Texture Rate: 12.31 GTexel/s
Floating-point performance: 228.10 GFLOPS

Board Design

Slot Width: Dual-slot
Length: 10.5 inches
267 mm
TDP: 143 W
Outputs: 2x DVI
1x S-Video
Power Connectors: 1x 6-pin
Board Number: P356

Graphics Features

DirectX: 10.0
OpenGL: 3.3
OpenCL: n/a
CUDA: 1.0
Shader Model: 4.0


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Our review database contains 403 reviews of the GeForce 8800 GTS 640.

G80 GPU Notes

Each Streaming Multiprocessor(SM) in the chip architecture contains 8 SPs and 2 SFUs.

Each SP can fulfill up to two single precision operations MAD per clock.

Each SFU can fulfill up to four operations SF per clock (these units can also handle single-precision floating-point multiplications per clock).

The approximate ratio of operations MAD to operations SF is equal 2:1.

The theoretical SP + SFU performance in single-precision floating point operations
[FLOPSsp + sfu, GFLOPS] of the graphics card with shader count [n] and shader frequency [f, GHz], is estimated by the following formula: FLOPSsp+sfu; f × n × 3.

Alternative formula: FLOPSsp+sfu; f × m × ( 8 SPs * 2 (MAD) + 4 * 2 SFUs ). [m] - SM count.

SP - Shader Processor (Unified Shader, CUDA Core)
SFU - Special Function Unit
SM - Streaming Multiprocessor

Retail boards based on this design

Name GPU Clock Memory Clock Other Changes
EVGA 8800 GTS KO ACS³ 580 MHz 850 MHz