There likely would be substantial differences from what you selected.
It is, but that was largely because I had to move away from OSX given the Mac Pro's deficiency anyway. I will explain further by hitting on the basic points you touch on:
A new Mac Pro very probably will have just 8 DIMM slots: just like the current one. If the empty 8 is solid future need then it waiting would not have improved things.
The total of 16 slots is a luxury. I have access, through clusters, to machines with 512 GB/1TB of RAM. But should our data expand, and I think its likely it will, having a little extra head room in a local machine could be quite nice and speed analysis thanks to avoiding queues and not waiting for large file transfers. And since I was already leaving a Mac behind, the added cost of machines in this class with 8 vs 16 DIMMs was pretty small.
8 3.5" drive bays. Not likely. Again the current 4 3.5" is probably the max. Perhaps some more 2.5" ones dependent upon how many ODD bays disappear in new design.
Similar to the RAM, I am actually configuring the machine to start with something that would be possible in a Mac Pro. I could convert an ODD bay and use it for the boot drive, if purchasing the theoretical mac, leaving the 4 other bays for the RAID. But since I am already leaving a Mac Pro due to over all uncompetativeness of the old machine, getting a workstation with 8 bays was not that hard for this kind of price. In total, I probably only added $500, at most, to the machine by having 8 HDD bays and 16 DIMM slots.
Doubt Apple will limbo this low (referring to the NVIDIA GT 520). Also have doubts will get more than two x16 PCI-e v3.0 slots even in the dual CPU package configuration (compared to the 3 in this machine). If keep the processor/RAM daughtercard design then same 4 slot PCI-e limitation that the single package configuration is pragmatically limited to (and again same slot count as current version). The dual package config would have better embedded GPU throughput though.
This is where a save some costs to offset the added DIMMs and HDD bays given my specific needs, thanks to the added flexibility of moving away from the Mac Pro.
Don't see the base system prices changing even with Sandy Bridge update. Depending how tight Apple is squeeze margins might start out with a pair of 5620 (instead of the 5630 pair here). If 5630's then a $200 price creep upwards.
I assume you mean the 2620s and 2630s above. And again, the 2630s are a luxury afforded by some added flexibility from other vendors along with just having the budget to afford the increase. With Apple, it may not be possible to so carefully chose the processors to match your budget since they usually only have 3 choices. For example, the jump to any of the 8-core xeons was just out of range and reasonableness for my budget and computational needs.
Very similar indicator is biolinux as being satisfactory OS. Loosing to biolinux doesn't keep the OS X folks up awake at nights with worry. Ubuntu either.
Oh, I don't think Biolinux or Ubuntu are threatening OSX, but OSX, because of UNIX, fit my needs. Windows does not. So for some the jump off direction from OSX will be linux solutions, for others (and probably many more people) it will be Windows. So, I'm sure Apple isn't concerned over losing me, but I know a fair number of people in my field that like using Macs but need linux/unix. So without a new Mac Pro soon, Apple will lose that admittedly small market. If they don't want it. Fine. I will make due. I'm sorry to lose OSX (at least in my workstation, I will keep my Apple laptop for now), but it isn't critical. But to be totally clear, I would have bought (or had my employer purchase for me) a Sandy Bridge E Mac Pro if it excited. The losses in hardware would have been worth the gain of OSX, but losing SBE on top of that was just too much.
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Probably better you went this route as I don't see apple updating the mac pro. If they do, the price would be higher compared to what you purchased. Apple should get there head out of there rear end and announce whether or not another one is coming. Allot of folks are holding off until apple does something. My guess is apple will announce EOL of the mac pro just like they killed off xserve. With apple stock dropping like a rock, don't see apple investing in another mac pro. Enjoy your new linux workstation. After I sold my 2008 mac pro, I built my own (see sig). Enjoying win7 64 and Ubuntu.
Thanks, I think I will enjoy this computer greatly. I have been on Ubuntu for a personal netbook and dealing with Red Hat in cluster environment for several years now. Now I will get the chance to have a very nice, modern machine and experience what today's linux has to offer.
As a side note. I would have loved to build my own workstation. However, this is a not ultimately my machine, but my employers. And I don't think they are paying me to build workstations....