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Originally Posted by JamesL /img/forum/go_quote.gif
From what I heard, nehalem is expected to perform 2x faster than today's offering. 'Futureproof' is such a misunderstood word in the PC industry. =/
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My $.02:
I do (theoretical) computational work for a living, and also enjoy playing computer games on occaison (FPS's mostly). I also produce 3D animations and process RAW photos as a hobby. This is CPU-intensive stuff. With the exception of running the latest games at high settings, my relatively meager machine handles it all just fine. (1.8 Ghz C2D, 4GB RAM, 7900 GS).
You say you do web surfing with occasional gaming. If you want a big badass machine, cool, gofer it. But that will be satisfying your desire to have a cool gadget, not satisfying your compute needs, really. You can suit your needs quite well for 3+ years on an average processor, good video card, lots of RAM and a big/fast hard drive or two. $600-800 should do nicely if you can build it.
SLI is pointless, unless you want to sit at the bleeding edge. For the last 2 years, two medium power cards at price X + X have underperformed relative to a single high power card at price 2X. And power consumption and heat are usually less on the high power card (versus double medium cards). I have SLI and also intended to buy an aging card for SLI double when they got cheap. Even so, I'm still better off buying a single more powerful card.
Nvidia has been working on a GPU offload solution for many years. It will never mature to the point that it replaces multi-core solutions on the desktop. GPU's are good at calculating many simple things in parallel...like pixels in a projected texture, or vectors in a 3D scene. They simply do not have the architecture for performing more complicated serial tasks efficiently. That is the purpose of a CPU--it is good at processing serial tasks, one after another. There is some promise for optimizing high performance computing problems (ie, scientific problems in physics, biology, etc) for GPU calculations...but this will probably not impact the desktop. The recently announced desktop acceleration in Adobe CS4 generation products is cool, but it only affects a small subset of processing options in the program...the bulk of calculations are still done on the CPU, not the GPU. And that is still at least 3 months off, IIRC.
There is always the "next best thing" on the horizon in computing hardware. Best to think of hardware like a commodity, not an asset!
I'd suggest you do what a couple previous posters have suggested...save yourself $800-1000 and try building something yourself. It can be fun, you get exactly what you want, and the warranty is often better. The process will make a trouble-shooter of you...no support necessary! You are essentially trading some of your time (~hours) for the cost of building. It is less important to buy the best motherboard than it is to get a rock-solid power supply. I used to like Seasonic (and some of the rebadged units like Corsair), but haven't looked at them for a year or so.
I don't recommend the average lay person assemble their own computer...but it is safe to assume that the Head-fi audience is, in general, more interested in techie gear and more proficient in assembling kit. Good luck!