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HTPC PSU question

Last Modified: 2012-05-12
I have built the following HTPC using the barebones of an old business workstation:

Core 2 Duo E6700
1x 7200 RPM SATA HDD
1x BluRay Combo
1x PCI-e TV Tuner
1x PCI Digital Sound Card

Currently just using a very old graphics card, and it needs to be upgraded to support BluRay playback - however, this is in a propriety (ie Dell) case, so the PSU is not upgradeable.

The PSU is 240W, rated @ 80%.

My current graphics choices are:
ATI: 6450/6570/6670.

Using PSU calculators, I can see that the current setup, including the workstation gfx card, puts the machine at approx 237W, which I believe to be unrealistic, as the manufacturer would not supply a PSU that is only *just* covering the required Wattage.

The 6450 will put the recommended PSU size at 247W, and the 6570 a little bit above.

Please let me know if you think placing a 6670 in my currently described build would work with my current PSU.

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