The Asus Crosshair II Formula does reasonably well for latency, and it only takes a slight hit in this benchmark when IGP is enabled.
RightMark Bandwidth
Ouch. At stock speeds, the Asus Crosshair II Formula takes about an 857MB/sec performance hit, about 25% when using IGP graphics; strangely the hit is only about 1.5% when overclocked - for this benchmark at least.