Select any two GPUs for comparison

Gaming Performance Comparison

Recommended System Requirements
Game GeForce 6800 Series 128MB GeForce 6600 GT
Cyberpunk 2077 2946% 4709%
Assassins Creed: Valhalla 2686% 4298%
Call of Duty: Black Ops Cold War 2595% 4155%
Microsoft Flight Simulator 2595% 4155%
Immortals: Fenyx Rising 2380% 3815%
FIFA 21 1436% 2326%
World of Warcraft: Shadowlands 4267% 6794%
Watch Dogs Legion 2838% 4538%
Genshin Impact 2946% 4709%
Grand Theft Auto VI 4186% 6666%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce 6800 Series 128MB are significantly better than the Nvidia GeForce 6600 GT.

The GeForce 6600 GT was released less than a year after the 6800 Series, and so they are likely to have similar driver support for optimizing performance when running the latest games.

Both GPUs exhibit very poor performance, so rather than upgrading from one to the other you should consider looking at more powerful GPUs. Neither of these will be able to run the latest games in any playable way.

The GeForce 6800 Series 128MB and the GeForce 6600 GT have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The GeForce 6600 GT has 4 GB/sec greater memory bandwidth than the 6800 Series, which means that the memory performance of the GeForce 6600 GT is marginally better than the 6800 Series.

The GeForce 6800 Series 128MB has 17 Shader Processing Units and the GeForce 6600 GT has 11. The two GPUs are based on different architectures, but deliver an equivalent shader performance. To compare, we must continue to look at the memory bandwidth, Texture and Pixel Rates. In this case, we sadly do not have enough data in this area to complete the comparison.

The GeForce 6800 Series 128MB requires 39 Watts to run and the GeForce 6600 GT requires 48 Watts. The GeForce 6600 GT requires 9 Watts more than the 6800 Series to run. The difference is not significant enough for the GeForce 6600 GT to have a noticeably larger impact on your yearly electricity bills than the 6800 Series.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed325 MHzvs500 MHz
Boost Clock-vs-
OC Potential - vs -
Driver Support - vs -
Release Date01 Apr 2004vs01 Nov 2004
GPU LinkGD LinkGD Link

GPU Memory

Memory128 MBvs128 MB
Memory Speed350 MHzvs475 MHz
Memory Bus256 Bitvs128 Bit
Memory TypeDDRvsGDDR3
Memory Bandwidth11.2GB/secvs15.2GB/sec
L2 Cache - vs -
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%

GPU Display

Shader Processing Units17vs11
Actual Shader Performance0%vs0%
Texture Mapping Units-vs-
Texture Rate-vs-
Render Output Units-vs-
Pixel Rate-vs-

GPU Outputs

Max Digital Resolution (WxH)2560x1600vs2560x1600
VGA Connections1vs1
DVI Connections1vs1
HDMI Connections0vs0
DisplayPort Connections-vs-

GPU Power Requirements

Max Power39 Wattsvs48 Watts
Recommended PSU--

GPU Features

Shader Model3.0vs3.0
Open GL1.5vs1.5
Open CL-vs-
Notebook GPUnono

GPU Supporting Hardware

Recommended Processor--
Recommended RAM--
Maximum Recommended Gaming Resolution--

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewThe groundbreaking new NVIDIA GeForce 6800 graphics processing units (GPUs) and their revolutionary technologies power worlds where reality and fantasy meet; worlds in which new standards are set for visual realism and quality, performance, and video functionality. The GeForce 6800 GPUs deliver powerful, elegant graphics to drench your senses, immersing you in unparalleled worlds of visual effects for the ultimate PC experience. Supercharge your gaming with the power of an NVIDIA GeForce 6600 GPU. The NVIDIA GeForce 6600 GPUs deliver best-in-class performance and advanced visual effects for next-generation games. The only GPU in its class with support for Microsoft DirectX 9.0 Shader Model 3.0 and with support for PCI Express, the GeForce 6600 delivers ultra-realistic effects, unmatched features, and rock-solid stability so you can play your game the way itís meant to be played.
Recommended CPU
Possible GPU Upgrades
GPU Variants