.  I'm not sure if Nvidia offers any special DVI-to-HDMI adapters that handle sound, but ATI does. (Ordinary DVI-to-HDMI adapters don't.) If your card supports such an adapter, it may also support LPCM over HDMI, which will give you lossless audio to the receiver--though not HD bitstreaming. *ONLY* in that situation would I recommend DVI/HDMI from your current card to the AVR; otherwise, keep it SPDIF to the AVR and run DVI/HDMI direct to the TV.  I suggest you get a better video card--one that will support HD bitstreaming and maybe even 0D (both of which your Pioneer will handle), though video cards with full 0D support are rather expensive right now and are generally limited to AMD/ATI's 0000 series. AMD's 0000 cards (like my 0000) will do HD bitstreaming, and have an intermediate 0D solution that works with most TVs; I believe the latest Nvidia cards will do the same thing. Even in that case, however, since your Pioneer has 0D passthrough, I would only run HDMI from PC to AVR, then from AVR to TV; that's how most HDMI AVRs are designed. (Dual HDMI outputs are usually only for older AVRs that can't handle 0D signals.)  