ATi has a monopoly on DX11 cards. They have not used this monopoly to charge exhorbitant prices, though there has been a bump is available prices since launch. Until Nvidia launches their DX11 cards, there is no question as to which company provides the most powerful cards, and where to go for price/performance ratios.
But the 5770 only has a 128-bit interface. A card such as the BFG GTX 260 OC Max55 has a 448 bit interface, and is selling way cheaper than the 5770 at this point, even if it only supports DX10.
A GTX 250 is only about $110 now, so in all reality that would be the perfect replacement for the 8800GT seeing as it is on most accounts the same card anyhow.
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.
"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."
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
•Programmable hardware tessellation unit
•HDR texture compression
OpenGL 3.2 support
Image quality enhancement technology
•Up to 24x multi-sample and super-sample anti-aliasing modes
•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