3DMark Vantage and feature tests
The first evidence that the Radeon HD 4870 X2 really is just two 4870s stitched together. In fact, its performance lead over two discrete cards could be put down to faster inter-GPU transfer on one board.
Test four, GPU Cloth, stresses the vertex shading, geometry shading and stream-out features of the hardware, where stream out is used to recycle the cloth vertices, according to Futuremark.
Nothing to write home about here, and multi-GPU setups, be they discrete card or on one board, don't do well. NVIDIA's got a solid edge here.
Test six, Perlin Noise, is a technique used for procedural texturing. As such, it's highly maths-intensive to compute in a pixel-shader and stresses the arithmetic (read grunt) of a GPU.
Ever wondered what 1,600 SPs and 2.4TFLOPS of potential performance can do for one board? Look no further than the X2's result, which is over twice as high as a GTX 280's.
Moving on to real games now.
