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Comment by StavrosK | Hacker News Reader

If I can ask a few questions:

1) Are Ebay/alibaba retailers trustworthy? I'd hate to be shipped a lemon (assuming they even ship outside the US).

2) Why must it be DisplayPort? Doesn't it support HDMI/DVI?

  >> Are Ebay/alibaba retailers trustworthy?

I have had very good results buying from sellers with >99% rating. I have had fairly poor results with sellers having 98% rating or lower.

I think that most people don't give bad reviews even after a bad experience. You might expect a bad experience once out of 50 times with a seller having a 98% rating, but I have found it to happen much, much more often.

I've got my Crossover 27Q a month ago from this seller: http://www.ebay.com/itm/CROSSOVER-27Q-LED-27-2560X1440-PC-Mo...

Fully working, no dead pixels, slightly non-uniform backlight (it could be seen only on black background). The display is really great for the price.

The only downside for me is glossy screen, but it seems there are no cheap 27'' korean matte displays.

Hmm, thank you. I thought about getting one, but I'm worried it's too materialistic. My current screen is fine, after all...

I am using a Potalion brand 27in IPS screen from eBay right now and I am very pleased with it. It arrived from Korea in a few days and it has been working flawlessly for about a year now. I payed under $300 shipped, which is pretty amazing, I think they have gone up just a bit since then. There are a few sites/forums/blog posts that compare them, here is one: http://www.swiftworld.net/2012/04/14/budget-korean-27-ips-mo...

To your second question, it's funny to me that my old Macbook Pro (2007) could drive it out of the box, as it had the large DualLink DVI port on the side. My newer Macbook Pro (2011) has to use Apple's Thunderbolt to DualLink DVI adapter, which works great, but is one more thing to think about.

1. I bought mine from green-sum on Ebay, no problems and his feedback is pretty spotless.

2. the Catleap range takes Dual-link DVI, which requires the powered adapter for (I use Apple's one for the MBP, and bought an extra minidisplayport -> displayport adapter for my work laptop).

So will a cheap mini displayport -> DVI adapter like this: http://www.monoprice.com/products/product.asp?c_id=104&c...

not work for one of these displays, coupled with a Macbook Air (2012)?

That will not work. You, unfortunately, need the expensive USB powered/assisted adapter. (I have both. Had to buy the other to drive the high resolution.)

I bought Apple's dual link adapter (http://store.apple.com/au/product/MB571Z/A/mini-displayport-...) . Was on special at a local store. It's not without problems, particularly awaking from sleep sometimes leading to "static" image blur requiring reconnection of the adapter.

Odd, I bought the dual-link adapter from monoprice and I thought I got gypped when my wife's Yamakasi Catleap would wake from sleep that way. I guess mini-displayport is just flaky in general.

When that happens, you can just put the display to sleep instead, then wake it a second later. That fixes the problem for me at least. The standard keyboard shortcut to put all displays to sleep is Shift-Control-Media Eject (⏏)

1. I wasn't shipped a lemon, so I can't testify as to what happens if you get one. That having been said, the person I bought from had tons of 99.8% reputation and I swear, I have no idea how it go to my doorstep from China so quickly (custom stickers and all indicating it erally moved that fast).

2. I have no idea why HD4000 won't drive that 2560x1440 resolution over DVI/HDMI. I just know that HD4000 has that prowess to output it and I read somewhere that it only works over DisplayPort. So far, based on my HD4000 MBA and desktop, that seems to be true. I'll see if I can find you a source on that.

edit: This is not the exact same ebay listing, but is from the same person and is the same product that I purchased: http://www.ebay.com/itm/New-Crossover-27Q-LED-P-27-DVI-D-Dua...

edit2: Sources on the HDMI/DVI/DisplayPort discrepancy: http://communities.intel.com/message/160909#160909

Thanks for your reply. I just bought a new nVidia card (GTX 650 Ti) and it doesn't include a DisplayPort, so it looks like I'm out of luck on this :/

Thanks anyway!

To clarify, I am driving my display over Dual link DVI from my Nvidia GTX-660. The resolution limitation is specific to both the HD4000 + HDMI/DVI.

That ebay listing indicates that GTX 4xx's and 5xx's are supported. I would suspect yours will be fine.

Oh, I thought you meant that it was a limitation of the screen. That's a relief, then. I have currently had a 22" LG for a few years, it might be time to get a new screen!

Thank you for your help.

No, the HDMI spec is restricted in the resolutions that it supports, it's nothing to do with the HD4000, which could be a separate issue

HDMI 1.3 supports this resolution and there are numerous sources that indicate that the HD4000 will not drive a 2560x1440 resolution over a DVI port. Also, me and everyone else with a Dual link DVI port and HD4000 will tell you that it flatly doesn't work.

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