"The bus width is a single variable, which in itself, is not a decider of performance. There are more factors at play, including the memory speed and type. Your assumptions are false, and you should educate yourself on these things more before you try giving ignorant advice again."
You're Right.
I'm still living in 7600GT land. That card was supposed to be end of all 128 vs 256 bit sparring, but it wasn't to be.
Here's a bit of education I found while combing the net.
Looks like those 5700 128-bit bus babies have some serious offerings.
ATI Radeon HD 5770 and 5750 Mainstream DX11 GPUs
Article Index: Introduction and Specifications The Radeon HD 5750 and 5770
A little less than a month ago, AMD unveiled the ATI Radeon HD 5800 series of graphics cards to much fanfare. And for good reason. Not only is the Radeon HD 5800 series the first to offer full DirectX 11 support, among other unique features like Eyefinity, but the flagship ATI Radeon HD 5870 signifies the first time since AMD acquired ATI that the company has had the single, fastest GPU on the market in their repertoire. Not only that, but Radeon HD 5800 series cards also offer top-notch image quality, great power consumption characteristics considering their performance, and they're competitively price too.
As is typically the case with the major GPU players, new products based on their latest architectures trickle down into lower and lower price points over time, until their entire product stack is comprised of cards with similar feature sets, with their main differentiators being performance and price. What is not typical of today's launch, however, is the speed at which AMD is ready with their latest round of product.
Today marks the introduction of the Radeon HD 5700 series. As you can probably surmise, the 5700 series has virtually all of the features of the 5800 series, but is targeted at a more mainstream market segment. In fact, the more powerful of the two cards being introduced today, the ATI Radeon HD 5770, has an MSRP of under $160, putting it within reach of far more consumers. The second card, the ATI Radeon HD 5750 drops in at an even lower $109 - $129.
AMD Radeon HD 5750 and 5770 DirectX 11 Graphics Cards
AMD ATI Radeon HD 5700 Series
Specifications and Features
1.04 billion 40nm transistors
TeraScale 2 Unified Processing Architecture
•800 Stream Processing Units
•40 Texture Units
•64 Z/Stencil ROP Units
•16 Color ROP Units
GDDR5 memory interface
PCI Express 2.1 x16 bus interface
DirectX 11 support
•Shader Model 5.0
•DirectCompute 11
•Programmable hardware tessellation unit
•Accelerated multi-threading
•HDR texture compression
•Order-independent transparency
OpenGL 3.2 support
Image quality enhancement technology
•Up to 24x multi-sample and super-sample anti-aliasing modes
•Adaptive anti-aliasing
•16x angle independent anisotropic texture filtering
•128-bit floating point HDR rendering
ATI Avivo HD Video & Display technology
•UVD 2 dedicated video playback accelerator
•Advanced post-processing and scaling
•Dynamic contrast enhancement and color correction
•Brighter whites processing (blue stretch)
•Independent video gamma control
•Dynamic video range control
•Support for H.264, VC-1, and MPEG-2
•Dual-stream 1080p playback support
•DXVA 1.0 & 2.0 support
•Integrated dual-link DVI output with HDCP
•Max resolution: 2560x1600
•Integrated DisplayPort output
•Max resolution: 2560x1600
•Integrated HDMI 1.3 output with Deep Color, xvYCC wide gamut support, and high bit-rate audio
•Max resolution: 1920x1200
•Integrated VGA output
•Max resolution: 2048x1536
•3D stereoscopic display/glasses support
•Integrated HD audio controller
•Output protected high bit rate 7.1 channel surround sound over HDMI with no additional cables required
•Supports AC-3, AAC, Dolby TrueHD and DTS Master Audio formats
ATI Eyefinity multi-display technology
•Three independent display controllers
•Drive three displays simultaneously with independent resolutions, refresh rates, color controls, and video overlays
•Display grouping
•Combine multiple displays to behave like a single large display
ATI Stream acceleration technology
•OpenCL 1.0 compliant
•DirectCompute 11
•Accelerated video encoding, transcoding, and upscaling
•Native support for common video encoding instructions
ATI CrossFireX multi-GPU technology
•Dual GPU scaling
ATI PowerPlay power management technology
•Dynamic power management
•Ultra-low power state support for multi-GPU configurations
Certified drivers for Windows 7, Vista, and XP
Radeon HD 5870 Speeds & Feeds
•Engine clock speed: 850 MHz
•Processing power (single precision): 1.36 TeraFLOPS
•Polygon throughput: 850M polygons/sec
•Data fetch rate (32-bit): 136 billion fetches/sec
•Texel fill rate (bilinear filtered): 34 Gigatexels/sec
•Pixel fill rate: 13.6 Gigapixels/sec
•Anti-aliased pixel fill rate: 54.4 Gigasamples/sec
•Memory clock speed: 1.2 GHz
•Memory data rate: 4.8 Gbps
•Memory bandwidth: 76.8 GB/sec
•Maximum board power: 108 Watts
•Idle board power: 18 Watts
Radeon HD 5750 Speeds & Feeds
•Engine clock speed: 700 MHz
•Processing power (single precision): 1.008 TeraFLOPS
•Polygon throughput: 700M polygons/sec
•Data fetch rate (32-bit): 100.8 billion fetches/sec
•Texel fill rate (bilinear filtered): 25.2 Gigatexels/sec
•Pixel fill rate: 11.2 Gigapixels/sec
•Anti-aliased pixel fill rate: 44.8 Gigasamples/sec
•Memory clock speed: 1.15 GHz
•Memory data rate: 4.6 Gbps
•Memory bandwidth: 73.6 GB/sec
•Maximum board power: 86 Watts
•Idle board power: 16 Watts
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