Did some research. Learned some stuff (some of which I may use for my
own experiments...later).
First off, let me state that, if you want a mainstream gaming system, the OS to choose right now is Win7 64-bit, your choice of either Professional or Ultimate. I'd go with Pro unless you need either
the extra language or privacy/drive encryption features of Ultimate.
THE top-of-the-line processor right now (End H1 2010) that'll game on Win7 is
the Quad-core Xeon X5677, which sports 12MB of cache and a top speed of 3.73GHz. There is no discussion. However, this is a server processor, which means that when you buy a machine with one in it, they tend to leave you room for another one to go with it, and these things ain't cheap at
about $1750 each just for the CPU.
I only seemed to be able to find 3 vendors (IBM, Dell, and HP) that offer preconfigured systems built around the X5677. IBM
does have
the System x3500 M3 which allows configuration of a (dual socket but) single processor x5677 system for about $5600, or dual CPU for around $8200. Both were configured with 12GB RAM, 2x500GB HDD, and redundant (dual) 900W+ PSUs/coolers. However, those prices do not include graphics card(s) nor OS. This isn't a bad deal IF you intend to use the machine for the next 8-12 years (2 good years of gaming, 4-6 years of production, then 2-4 years as 'the emergency spare machine' or something), but that's an awful lot of money to spend on the computer equivalent of
a Volvo XC90 SUV when what you are really looking for is a
Subaru WRX STi.
The next closest performer CPU-wise is
the Core i7 980X. It is 130MHz slower across the board than the X5677, can't use more than 24GB of RAM, and
a few other things, but it
does have 2 extra cores. This
won't make any difference in gaming (yet), but it
will help with multitasking when the machine eventually gets demoted to a production unit. So what does a worthwhile boutique system based on the 980X go for (not counting independent ebay units)? After some searching, I found that the magic number starts at about $3100, which appears to be the point where you start to find systems that not only have a 980X CPU, but also have a decent GPU (GTX 480, Radeon 5870) to go with it. At the top end of the spectrum you can find
$7000 liquid-cooled, factory overclocked systems that have dual ATI 5970s (each one is already a dual-GPU card, so that's 4 GPUs total) and hyperexpensive SSD drives, but I'm sure they are also rather high-maintenance, so I can't confidently recommend such a machine. The sweet spot seems to be between $4000-5000, and here are some models that look appealing (on paper):
Cyberpower - $3600 (!)
Gamer Xtreme SSD-X with upgraded fans, noise reduction, mid-overclocked 980X, liquid-cooled, Gigabyte -UD7 MLB, 6GB Dominator RAM, Dual EVGA GTX480 SLI, 1200W PSU, 2x1TB HDD in RAID-1, HDD cooling, Sony DVD/CD burner (deleted SSD since all of them are MLC, not SLC).
Alienware/Dell - $4500
Custom-configured
Alienware Area-51 unit: Win7-64 Pro, Overclocked 980X, Dual GTX 480 SLI, 6GB RAM, 2x1TB HDD in RAID-1, Single DVD/CD burner, integrated audio, free kbd/mouse, WinUpd for crit only.
TilaTech - $4600
TilaTech Six Core Dominator looks good to go right out of the gate.
There's three units to discuss. I know I'm pretty good about picking components, but I want to hear what other people have to say. Y'all may catch something I missed.
--Patrick