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I have an external monitor with a VGA connection. What is the best adapter to use for my Retina MacBook Pro? I think I've seen Thunderbolt to VGA, or USB to VGA? Or HDMI to VGA? What are the differences?

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I use my old mini-display to VGA converter on my retina MBP, it works great. Unless you have some specific requirement, I don't see any differences on those options you mentioned above. And if I were you, I wouldn't buy VGA to USB, cause the Macbook Pro only has two USB ports, and I want to use them for some other devices... –  Jing Dec 3 '12 at 1:46
    
@jing good tip, thank you –  andrewliu Dec 3 '12 at 2:17
    
For many of us using MBP retinas, Apple's VGA adapter results in fuzzy video (hard to read text). My old Macbook Pro VGA adapter had no problems with it. –  sventechie Apr 11 '13 at 17:55

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up vote 10 down vote accepted

You should get a mini DisplayPort to VGA adapter (sometimes referred to as a Thunderbolt to VGA adapter, but it's the same thing). Apple sells one, but they can be had elsewhere for less, including at my personal favourite, Monoprice.

You could do HDMI to VGA, but it would require a (typically bulky) active adapter. There are some HDMI to VGA adapters that aren't active, but they rely on graphics card support that Macs don't have. The DisplayPort to VGA adapters are technically active adapters, but for whatever reason they seem to be much more compact than HDMI to VGA ones.

There are USB based display adapters, and some of them have VGA output, but I'd only recommend them for situations where other outputs aren't available. They're essentially a USB connected graphics card, which means that performance is lacking, and it takes up CPU and memory resources that the built-in outputs don't. Useful for some situations, but in your case I'd stay away.

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Thank you, this helped me a lot! I'll get the displayport to vga –  andrewliu Dec 3 '12 at 2:14
    
Do you also know anything about the speed comparisons of DisplayPort to VGA vs HDMI to VGA? Are either of them more likely to have lag? –  levininja Oct 13 at 17:37
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@levininja the interface technology shouldn't really have any impact on input lag on a display. The dominant factors there are within the display itself (scaler/input chips, and the panel technology). It is possible that on a given display one input might be more or less laggy than another (say if VGA needs to be converted to digital), but that will vary for each display. I'd suggest using the most advanced one you can (probably DisplayPort). If input lag really matters a lot, read some review sites that focus on it. –  robmathers 2 days ago

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