Thread: ATI Radeon HD 4770 Graphic card test

the ATI Radeon HD 4770 640 has stream processors - not bad, because then it is between the Radeon HD 4670 (320 units) and 4850 (800 pieces). Thanks to the finer manufacturing process, higher clock speeds are possible. The GPU of the new works faster with 750 MHz, ie 125 MHz. When compared to the memory of the 4850er is more complicated: while the memory clock of 800 MHz to 200 MHz lower. The memory interface is 128-bit only half as wide. But for that accesses the Radeon HD 4770 chip on GDDR-5 memory, not GDDR3 RAM.

To start, we were able to examine a graphics card in the Test Center. It has 512 MB GDDR-5 memory. Fired the card from the PCI Express slot and a wall outlet. The loss of the card is according to the manufacturer at 80 watts - for comparison, the 4850er draws 110 watts of power. This interfaces are two DVI connectors and a TV output. Multiple cards can be linked together via the also existing Crossfire interface.



Naturally, the AMD ATI Radeon HD 4770, the software interface of Windows XP, including DirectX 9 And this is even quite fast: Benchmark 3D Mark 06 is the new chip is significantly higher than the entry-level GPUs 3870 and 4670thFor high-order model from the high end league, the Radeon HD 4850 to separate the card only about 6 percent - in practice would be a performance difference does not remember. The classic 3-D horror cracker FEAR, which uses the DirectX 9 interface 4770er came to 42, the 4850er at 49 frames per second - albeit at the highest image quality and high-end resolution 2560 x 1600 pixels.