Hello @BrettSanders,
I want to be sure that I understand you correctly. You wish to go from VGA video source out to an HDMI display, and you need a converter that can accomplish this at lower resolutions.
If I have that right, there are a few different options to consider, depending on what you wish to achieve.
StarTech VGA to HDMI Adapter w/Audio
Mfg.part: VGA2HDU
The VGA2HDU can connect to a VGA port directly then connect to an HDMI display via your HDMI cable. The USB connection is needed for power and audio. If audio is not needed it can be connected to any powered USB port. You will note in the technical specifications that we list various resolutions including 640x480. All of these resolutions will be at 60Hz. However, I do not see 720x400 @ 70Hz on this list but this list does not appear to be exhaustive so I might expect this to work fine. Of course testing may be the only way to tell for sure with some equipment.
StarTech Component VGA (PC) to HDMI
Mfg.part: VGA2HD2
The VGA2HD2 is another option to consider. It includes a power supply and RCA audio support. VGA2HD2 supports up to 1080p video also, so I should certainly expect lower standard resolutions to work fine too.
There are also some cable based options that are quite similar too:
VGA2HDMM6 -
VGA2HDMM3M -
VGA2HDMM2M -
VGA2HDMM10 -
If I’ve got the wrong idea, please let me know and I can take some time to look at our other options that will be a fit.
There can be a lot of different variables with video conversion solutions so if you have some more details about your equipment that you can offer, I can take some time to go over those and see if we can make better recommendations. The make and model of your VGA and HDMI devices can help point us in the right direction, or maybe come up with another creative solution.
I hope that this information is helpful. I’ll check back here again later in case you have more details or questions.
David