Radeon HD Series 6770 Specs

Radeon HD Series 5770 6770 Specs

The "new" Radeon HD 6700 series GPUs have 1040 million transistors. Correct, that is 1+ billion transistors tucked away in a small chip. The fabrication node, just like the 5800 series, is 40nm for this product.

• The reference Radeon HD 5770 / 6770 will be clocked at 850 MHz. Its memory is clocked at 1200 MHz (4800 MHz effective).
• The ASUS 6770 DirectCU Silent is clocked at 850 MHz and the memory is clocked at 1000 MHz (4000 MHz effective).

Shader processors then; similar to the Radeon HD 4850/4870/4890/5770 and now 6770, will have 800 Shader processors again... same 40nm chip.

The number of ROP units are rocking steady at 16 and sure -- texture units remain at 40 for the 6770.

These numbers are reasonably good, for the money this is a nice entry level product series. Much of the magic is thanks to the fact that ATI sticks to DDR5 for their mid-range and high-end products. On the 6770 they'll crank it down a notch as we get 128-bit memory, cutting the bandwidth in half from 256-bit. However, since it's GDDR5 memory (quad data rate) it will still offer sufficient bandwidth, 80GB/sec of it actually.

But sure the culprit of the 5700/6700 series will be that cut off memory bandwidth, and this is the reason why its performance actually will be slightly lower (on average) than say a Radeon HD 4870.

So the card while cooled passively, is clocked at 850 MHz and the 1GB 128-bit GDDR5 memory clocks in at an effective data-rate of 4000 MHz, slightly slower than reference actually. As said before, this product has 800 shader processors.