It's been ages since we've tested 4-Way CrossFireX actually. Recently we did a bit of 3-Way CrossFireX action with the introduction of the Bulldozer and Sandy Bridge-E platform, but apart from that there hasn't been any real reason lately to expand from those numbers; that along with the fact that most boards support only up to three cards.

The introduction of the new high end platform from Intel means that we're starting to see 4-Way boards hit and our new X79 testbed which finds itself graced with the ASUS Rampage IV Extreme supports four way CrossFireX and SLI.