Advice on First HTPC

I’ve added my comments below based on the assumption that this will be for htpc/general use only, ie no gaming 🙂

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nVidia GeForce GT 240
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This isn’t necessary for htpc use as the integrated graphics from nvidia, amd, and intel are all sufficient to handle htpc tasks

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Intel core i5-750 2.66 GHz
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Again, if this is just for htpc use and even general use the i5 is way overkill.  You can save your self some money by dropping down to an i3 and you’ll get the added benefit of having the clarkdale integrated graphics which is capable of bitstreaming HD audio from bluray discs

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Open to suggestion for a motherboard
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I’m partial to msi motherboards so for me, I would go with [url=http://www.newegg.com/Product/Product.aspx?Item=N82E16813130263&cm_re=h57-_-13-130-263-_-Product]this[/url]

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Would like a case like this [url=http://www.directron.com/csdm318.html]one[/url]but am open to suggestions.
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I’ve never used that case but there are plenty of cases of that size.  Just be careful that if you do decide to add a video card or tv tuner that you get ones that are low profile otherwise they won’t fit in the case.

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Will need advice on a tv tuner eventually
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Your tv tuner will obviously be based on what your tv service is (cable, satelite, ota) and which software package you tend to go with.  Currently, Windows Media Center is the only software that currently supports cablecard tuners which allows your pc to tune all of your channels without the need for an external set top box.

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Do I need an audio card?
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Nope, with the i3 and the h57 chipset, you’ll get audio over hdmi (assuming you’re using hdmi)

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When I was looking at this I think the power consumption will be close if not above that of the power supply that comes in the case.  Is it possible to get a better power supply that fits in a case like the one I showed?
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Your power consumption shouldn’t be anywhere near using the 275 that comes with that case however you can definitely replace it, you would just need to purchase a flex power supply vs. a standard ATX power supply.

Unfortunatley you will not be able to use the RAM from your old system as both intel and amd now use DDR3 which just recently became mainstream in the past year and a halv. However the cost savings of dropping to the i3 and eliminating the graphics card should more than cover the cost of RAM.

Since you mentioned the issue of available resources, if SageTV fits your needs, then you should definitely look into the possibility of running SageTV on your old desktop and purchasing their new HD300 extender for your viewing location.  For the extender and Sage software ($200), and PlayOn software needed to get hulu and netflix through SageTV ($80), your total cost is under $300 and you have a great foundation that supports tv and bluray for when you add them.  The cost for your htpc would be roughly $430 (Core i3 530 – $115, msi h57 mb – $100, 4GB RAM – $75, Windows 7 OEM license $100).  Depending on how you view it, you can either pocket the additional savings or use those savings to go ahead and add a bluray drive and a tv tuner.  I didn’t include the software costs that would be required in both scenarios ( such as anydvdhd to remove copy protection to rip dvds and blurays).

And if you do decide to go the HTPC route, renethx on avsforum has put together an amazing and helpful guide of recommended systems [url=http://www.avsforum.com/avs-vb/showthread.php?p=18816470#post18816470]here[/url]