On the ROG press release, it states copper. Not that the (anodized!!) aluminum of the M6F had anything wrong with it to begin with, other than the misconception that the aluminum would cause corrosion.
Again, there is absolutely nothing wrong with the ANODIZED aluminum M6F Cross Chill block....check the M6F Owner's Club thread for the details! Specifically, JackNaylor's posts about the aluminum block.Engineered for champions in pursuit of extreme performance
ROG Maximus VII Formula gaming motherboard
Maximus VII Formula is ROG's flagship Z97-based ATX gaming motherboard. All-new CrossChill Copper is engineered with a copper cooling channel that's incredibly effective at removing heat. It's great on air, and with liquid-cooling critical MOSFET temperatures are lowered by up to 23°C. The G1/4-inch threaded fittings mean CrossChill Copper is ready for existing cooling setups.
Maximus VII Formula includes ROG's celebrated SupremeFX Formula 2014 technology for audio that's as great as a dedicated sound card. With cutting-edge electromagnetic interference (EMI) isolation and exceptionally-premium components, SupremeFX Formula 2014 delivers best-in-class 120dB signal-to-noise ratio (SNR) audio output for gaming punch and Hi-Fi excellence. Exclusive Sonic SenseAmp technology automatically detects headphone impedance and adjusts accordingly, and SupremeFX Formula 2014 is able to drive up to 600ohm headphones. Moreover, hardware-level Sonic SoundStage applies the best audio settings for popular game genres.
ROG's best motherboard is pre-fitted with mPCIe Combo III + 802.11ac / Bluetooth 4.0, a compact connectivity module that delivers the latest wireless technologies along with mini PCI Express (mPCIe) and M.2 (10Gbit/s PCIe x2 and 6Gb/s SATA) slots.