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ottoyu34
10-16-2010, 12:44 AM
The fine folks at IT168 revealed the first pictures of the Radeon HD 6870 PCB with its cooler completely off, and in its production livery (black). Also let out is the first [clear] picture of the GPU itself. The PCB was first pictured in its nascent qualification sample form, with a development GPU cooler on. The final version of the PCB sticks to its qualification sample for the most part, it has VRM components positioned forwards, trailed by the GPU and its memory. The card makes use of a 4+1+1 phase VRM. All eight memory chips are on the obverse side, each with its own 32-bit wide path, since there's a 256-bit memory interface.

The GPU package is of the same dimensions as the Cypress package, albeit a smaller die. We're getting to hear that Barts is pin-compatible with Cypress (meaning that a Barts GPU can be placed onto a Cypress PCB, given the appropriate BIOS, and it will work), however, no AIB is likely to reuse Cypress PCBs other than for Eyefinity6 designs, because while Barts can make do with a 6-layer PCB, close to every existing Cypress PCB is an 8-layer one, and that Cypress PCBs lack the second mini-DP connector. The die is placed diagonally on the package ( la Cypress and R600), it is rectangular, while the Cypress die is more or less square. ChipHell.com contributor musicinlove did a nice size measurement and comparison. Finally, the AMD "arrow" logo is etched onto the die, it's curtains down for ATI.

http://www.techpowerup.com/img/10-10-14/78a.jpg
http://www.techpowerup.com/img/10-10-14/78b.jpg


Source: http://www.techpowerup.com/132802/Radeon-HD-6870-PCB-and-GPU-Pictured.html