640 Shader, 40nm and GDDR5 for less than 100 Euros

Review: Ati RadeonHD 4770 vs. HD 4850 & Geforce 9800 GT

The Radeon HD 4770 is the first desktop graphics card with an RV740 GPU in 40 nanometer structure. Ati's new card competes with the Radeon HD 4850, Geforce 9800 GT and Co.

With the Radeon HD 4770, the first graphics card with "40 nanometer GPU” AMD wants to enter the crowded sector of sub 100 Euros graphics cards. We tested with up-to-date drivers and with common games like Call of Duty: World at War (dt.), Race Driver Grid or Fallout 3 if the card can succeed in its field of operation.

Radeon HD 4770 Launch-Review
Radeon HD 4770 Launch-Review [Source: view picture gallery]

Radeon HD 4770 Launch-Review (21)
Radeon HD 4770 Launch-Review (21) [Source: view picture gallery]
Due to the 40 nanometer technology and the slim 128 Bit memory interface the production costs and thus the prices for the customers are supposed to be kept low. The GDDR5 is expensive, but it runs much better than according GDDR3 chips. The number of operating units and the clock speeds indicate a performance level between HD 4830 and HD 4850 - all in all a quite interesting card that is introduced today. AMD expects a price between 90 and 100 Euros for the market introduction.

Ati Radeon HD 4770: Technical specifications
We want to keep it short and summarized the most important specifications in the table below. The RV740 chip is divided into 8 SIMD units with 16 optimized 5-way ALUs each. Each of the SIMDs has access to a Quad TMU so that all in all 32 texture values can be handled per clock.

The high data transfer rate of the GDDR5 - on our test sample there are 40 modules from Qimonda - compensates the slim, size efficient interface almost completely; thus the HD 4770 has enough bandwidth per Pixel/Texel (more is better of course). In contrast to the RV730 GPU on the HD 4670 the RV740 also supports the so called "Doubles”, FP64 or Double Precision, which are primarily used in extremely exact scientific calculations.

Picture gallery  (enlarge to view source)

Author: Spille, Vötter, Sauter (Apr 28, 2009)

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