The machine arrived yesterday. Right off the bat, it geekbenched ~20600 in 32-bit mode. I'm not going to pay for the 64-bit, but I doubt its much different relative to other machines. Maybe the newer architecture takes a little bit better advantage of 64-bit mode than the westmeres, but I doubt by much. So I'd estimate 64-bit mode to be around 23600. However, the RAM is showing up as 1333 MHz, despite it being 1600 and supposedly having the processors and motherboard to support 1600. So, I have some tinkering to do with the BIOS. Plus, noise permitting, I'm going to set the BIOS to the most performance based configuration I can while stopping short of any under/over clocking.
Also, since it's a SuperMicro, that stuff is going to be loud. I've worked in the same room as a SuperMicro OEM tower, and they're not pleasant to be around. Not an issue if the machine is located in another room, but damn, I would hate to have to run one of those as a workstation under my desk having used a Mac Pro for the last many years.
I also thought I would bring up the noise, since it was brought up before by ScottishCaptain above. Well, its pretty quiet with 2x80mm fans in front, two huge heat sinks and fans on the CPUs, and 1x92mm fan in back. Not as quite as my previous work machine, an 8-core 2.4 GHz 2010 Mac Pro, but definitely not loud. The main thing right now is not the fans, even during a relatively short but stressful test of my own, but rather the hard drives. For now, the machine is sitting right on top of my desk with the disks maybe within 18 inches of my ear. Once I move it a couple feet away and off the top of my relatively small desk, I am guessing I will probably hardly notice the noise over things like refrigerators that are across the room.
I'll take your challenge!...lol. You might win on performance, but loose on support.
Many professionals don't like building their own systems as they have to provide their own support if their workstations go wrong.
This is true, but not as much as you're thinking. This is exactly what Red Hat is for and what these custom build vendors are for (Even HP/Dell/Lenovo all have good options for these kinds of machines, but they aren't as cheap). For example, the rough equivalent machine as what rabains built could be configured from Silicon Mechanics (which also has wonderful support, I'd say even better than Apple) for about the same price as he listed, just without the GPU to be bought separately.
http://www.siliconmechanics.com/quotes/241580?confirmation=1837339514
Add RHEL and you have machine with full support and an OS with full support. RHEL is expensive, but its no more expensive than the Apple tax. Or, if you're in a medium/large company/institution, you likely have IT support ready for RHEL anyway. So, Apple loses nearly all its advantage in those settings, and thus without a competitive price/performance ratio, it loses sales.
If you're a professional that depends so heavily on a $5-10K computer to make a living, its really not that hard to justify putting some time and energy into the best computer for your needs and not just hoping some out-of-box solution from Apple (or anyone else) is the right thing. In my case, it was particular hard to justify to myself to spend maybe ~10% more money for 10-20% less CPU performance, 25% less RAM (that's just as configured), and 1/2 the data storage expandability on a Mac. Gaining that was, for me, certainly worth a tiny bit more tinkering over a Mac (its not like Macs are without their own software frustrations that would require my time, i.e. I can just sudo apt-get many of my research specific software on Ubuntu that might take half a day, or much more, trouble shooting and configuring on a Mac).