LED pj and Desktop- HDMI to DVI or HDMI to VGA? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 10 Old 03-23-2013, 06:37 PM - Thread Starter
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I've been using an Optoma LED pj for 2 years with my custom built desktop that has a video card with dual DVI connections (old EVGA 9500GT).

I simply used a VGA to DVI cable but now have an AAXA M2 pj with an HDMI input on the back.

Is there much or any difference using an HDMI to VGA cable vs HDMI to DVI?

The HDMI to VGA would let me use the existing VGA to DVI cable that runs to the desktop video card but would be an extra link or sorts.
The HDMI to DVI would be simpler with one cable but would there be any problems or handshake issues? I know nothing about HDMI!

Thanks
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post #2 of 10 Old 03-23-2013, 06:56 PM
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HDMI and DVI are essentially the same, both digital, however DVI doesn't carry audio. HDMI to DVI would be your best bet, since you are not converting to an analog VGA signal.
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post #3 of 10 Old 03-24-2013, 06:02 AM - Thread Starter
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Cool that confirms what I had researched but I wanted to be sure so thanks!
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post #4 of 10 Old 03-24-2013, 07:18 AM
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Quote:
Originally Posted by sitlet View Post

HDMI and DVI are essentially the same, both digital, however DVI doesn't carry audio. HDMI to DVI would be your best bet, since you are not converting to an analog VGA signal.

Some PC DVI does indeed carry audio with an adapter. We discuss this about once a month or so.
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post #5 of 10 Old 03-24-2013, 11:02 AM - Thread Starter
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LOL, I'm not worried about the audio anyway as I'm handling audio via spdif into an old Technics 100x5 AVR/Klipsch/DIY sub setup...
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post #6 of 10 Old 03-24-2013, 11:05 AM
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9500 GT supports audio over DVI (with a DVI-HDMI adapter) only when S/PDIF header of the mb is connected to the card (so audio is limited to DD, DTS, 2ch PCM).
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post #7 of 10 Old 03-24-2013, 02:58 PM
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Reasons you may wish to switch to DVI>HDMI
  1. You are experiencing static or other interference
  2. You plan to watch Blu-rays without the help of Anydvd hd
  3. You plan on watching ultraviolet movies, vudu, or other online streaming services that may require hdcp

Even if none of the above affect you it's probably worth upgrading simply because of how cheap the cables can be purchased at amazon, monoprice, etc. A digital to digital connection will always be better then analog.

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post #8 of 10 Old 03-24-2013, 06:57 PM - Thread Starter
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Yeah you're right, for $19 shipped I ordered a 25' cable so I'm excited. It's all overkill since I'm only using an Aaxa M2 1024x768 native res LED pj but since the Aaxa doesn't have a VGA input, might as well clean up the cabling.

Too bad I don't get it till Thursday.....
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post #9 of 10 Old 03-27-2013, 11:50 AM - Thread Starter
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Ok well I received the cable that runs from my desktop video card (EVGA nvidia 9500GT) to the Aaxa M2 but the image quality isn't very good. In fact, compared to my 50 lumen Optoma PT100 which was connected via VGA to DVI cable, the AAXA M2 (higher resolution) via HDMI to DVI looks crummy. Very pixelated and grainy using a SD DVD to compare.

BTW, the cable is DVI at the video card and HDMI going into the led projector.
I also can't get the native 4:3 projector to display 16:9 which I'll be using it for (I knew this before buying it) but I'll have to likely find someone with the same pj to get some ideas on that.

It does also have some 'mini VGA' port on the PJ and the AAXA came with a 'mini VGA' to VGA (15 pin) adaptor cable. Only thing is that I'd still have to convert back to DVI at the video card so I dunno...I may go back to the 854x480 pj after this is all said and done lol.

If anyone has any thoughts, feel free to shoot.

Thanks!
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post #10 of 10 Old 03-29-2013, 02:04 PM - Thread Starter
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Ok another update: I'm not sure if my Bluerigger HDMI to DVI cable is the problem or not. Using nvidia's control panel, I have the projector's 1024x768 native resolution selected in the control panel.

However, image quality is very soft, a bit blurry (it's not the focus ring). I paused a SD DVD that looks fine with my DVI to VGA equipped Optoma PT100 pj and everything looks fine but with the AAXA and HDMI to DVI, text is blurry. The only way to describe the text is 'smudged', not sharp at all.

If it matters, the AAXA pj is HDMI 1.2 compatible and I believe the Bluerigger cable is the latest 1.4 protocol.

Could that be the cause?

There is no SDE, the picture is very smooth but not defined or sharp and it's no fun to watch. Help guys!
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