Take a look at this monster platform from Alliance Systems, the Q-6000 has quad dual core processors in a fault resilient chassis.
The system leverages the highest performing Intel E8500 chipset that supports four-way, EM64T 64-bit operation and dual-core Intel Xeon processors with a 667 MHz front side bus, hyper-threading technology, and 64 GB dual-channel DDR2 memory. Several new memory features are quite interesting such as 4-way interleaved, hot-add, memory mirroring, and memory RAID.
Using PCI-Express, the system drives throughput to the storage subsystem at a substantially higher rate than previously recognized with PCI technology. This performance is realized primarily during data transfers in storage intensive applications. Storage capabilities include up to ten Ultra320 SCSI drives using the dual-channel SCSI controller.