|XFX Radeon HD5770 Video Card HD-577A-ZN|
|Reviews - Featured Reviews: Video Cards|
|Written by Bruce Normann|
|Wednesday, 28 October 2009|
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XFX Radeon HD5770 Specifications
The XFX Radeon HD5770 specifications don't fit neatly between two or more competing, or legacy models. It's tempting to compare the card to the HD4870 and HD4890, but the HD5770 has only half the memory bus width of the entire HD48xx series; however every single 5xxx card runs GDDR5 memory at very high clock rates. The memory bandwidth of the HD5750 compares favorably to the HD4850, at 73.6 GB/sec versus 63.5 GB/s, but falls way behind the HD4890 which runs at 124.8 GB/s, as well as all the NVIDIA G200-based cards. It's the penalty ATI paid for slicing the "Cypress" directly in half in order to get the "Juniper". You can see the complete specs in detail a little further below on this page. The real story is how ATI has been able to reduce the cost of the HD5700 platform to below the HD4850. Take a look at where the four versions of the HD5xxx series end up relative to their forefathers. And remember, this is all based on launch pricing...
Now let's look at the actual HD5770 specs in detail:
Radeon HD5770 Speeds & Feeds
Although this review is for the HD5770, the HD5750 is being released at the same time and the two cards are based on the same silicon. The HD5750 is likely built with chips that didn't meet the top clock spec, and/or had a defect that killed one of the stream processor units. As anyone who has followed the AMD product line knows, modern processors are designed with the capability of disabling portions of the die. Sometimes, it's done because there are defects on the chip (usually a small particle of dust that ruins a transistor) and all the internal sections don't pass testing. Sometimes it's done with perfectly good chips because the manufacturer needs to meet production requirements for lower cost market segments.
It's aways a delicate balance between economies of scale (building massive quantities of only one part) and the fact that you can usually meet the requirements for the lower priced product with a cheaper part. ATI has all the bases covered in this latest series of product launches; they've got the more expensive chips in the HD5800 series and the much cheaper, half-size chips in the HD5700 series. Within each series, they've got reduced spec versions that ensure that they make the most of the manufacturing yields that TSMC is able to achieve at the 40nm process node.