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Another consideration is AMD is changing over to the 940 socket (M2)
You can already buy M@ capable boards, the best 'multi-purpose' option being the ULi ASRock S939 board with the M2 socket.
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that being said what improvements will DX10 give over DX9 how important are they to you. When will you see the effects of that programming in a game? If you are considering an X1900xtx remember that chip is programmable. Is it possible to 'program' the attributes of DX10 into the ATI 580? I don't know!!!
Of course not, because it's not. It doesn't support the required element or the shader length, flexability in the core itself (like trying to run 64bit code on a 32bit processor [or 32 on 16/8]). Also it's not as programmable as you would need either. This isn't a question of tweaking, it's a completely new architecture involving things like geometry pipeline (in addition to the current vertex and pixel piplines) all running in parrallel. Any type of emulation running through the R580 would pay a huge performance penalty.
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Is it possible that the crossfire boards of the future will have the DX10 chip? again who knows.
True but unlikely as they wouldn't be able to process in parralel, the DX9 card would be a burden, at best you could hope the DX10 card emulates the X1900, which would probably still be slower than having 2 X1900s.
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Lets face it DX10 will be eclipsed by DX11.
Sure, if there ever is a DX11, and not something else. There'll probably be alot of DX10.0A/B/C , D10.1 flavours before moving to DX11 or soemthing dramatically new that would 'eclipse' DX10.
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Another thing to look at is why are you buying an NF4 board if you are thinking about an X1900xtx WAIT for the ATI Crossfire boards to become available if you are going to get an X1900xt*. I had no choice, you do. When the time comes I will upgrade to an ATI Crossfire M'board
Sofar no crossfire boards will support M2 so I'd go with the cheaper ASRock board, save the money and upgrade when needed the new feature, including Crossfire. Buying a Crossfire board with the current RD580 and RS480 chips would be a bad idea IMO compared to the RS600 which will launch in the summer.
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Let me confuse you some more. The 940's will probably be using DDR2 ram part of the platform of the future. If you buy a system now your RAM will be 'obsolete' to use on the new system
Not necessarily, as the ASRock board shows the M@ does not force you to DDR2, you will probably just benifit most from it, and hey upgrade when you need to, the ASRock will let you keep your RAM and then use the M2 with plain DDR.
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So can you wait for a
1. ATI chipset board that supports crossfire w/
2. AMD 940 socket
3. ATI videocard with DX10
4. DDR2 ram to be cheaper to buy
That's a LONG frickin' wait, the DX10 cards won't be here 'til the end of the year at the earliest. As for DDR2 it's already cheap, often cheaper than plain DDR. The timings just suck, real bad!
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or if you need to get it sooner
1. NF4 chipset board SLI A8N32-SLI
2. w/ 939 socket
3. New Videocard offering from Nvidia
No need to get an nVidia card anymore than an ATi card, and there are Xfire boards now, so for S939 that's an option two under your scenario. The best offering now are the best period, regardless of board, but SLi or Crossfire from the start are far less important for long term upgrade, because as you say, the foundation will change by then. Buying something for right now and then upgrading to an old SLi or Crossfire board when you finally do decide to get a second card will likely cost as much overall as buying one of those boards now. The SLi / Xfire premiums now are too much. I'd worry about SLi/Xfire when you feel you NEED it, not before.
To me waiting too long is always a put-off, however the flexability factor is nice to avoid buyer's remorse. The only thing that's a true mystery is the GF71's features/performance, everything else is well roadmapped and easy to plan for. DX10 is not an issue, not for a long time.