At stock speeds, there is surprisingly little hit on processor performance on the Asus Crosshair II Formula by using the integrated graphics, however when overclocked, the difference becomes more pronounced at over 2%
Sandra Memory Bandwidth
As one would expect, the Asus Crosshair II Formula takes a big hit in memory performance when IGP video is enabled; however when it is not enabled, the memory performance is quite good.
Sandra Latency
At stock, the Asus Crosshair II Formula does not take a big hit for IGP, but when overclocked, latency increases significantly when using IGP graphics. When using a GPU, the board does well.