Going "high" resolution, need advice
I would avoid those ebay Korean brands. Unless you know exactly what you are getting yourself into, or you really need 2560x1440 and on budget and can't wait for your budget to grow.
The reason why I am saying this is you get what you paid for. There is a reason why these monitors are cheap. Yes, granted, I am sure that Dell, ASUS, Lenovo, LG, HP, NEC, and about another manufacture that sales monitors have high markups, especially in this range of product. But still.
The way these small businesses running on eBay, selling monitors do, is that they purchase A- panels from manufacture (usually Samsung or LG, as they are the biggest IPS panel producers).
A- panels, are panels that are faulty. The faults can be visible (dead/stuck pixel) or not (doesn't means specifications, or other issues that are not faulty pixels, such as: too slow, malformed grid resulting in a area or full screen not as sharp as it would be (might or might be visible to you, or notice, unless you have the proper panel next to you), durability issue (transport, survive hits, or longevity of the product not reaching the original warranty of the panel). LG, and Samsung offer 3 year warranty on the products they made, that is why company that implement these panel, also offers you 3 year warranty. I mean the panel is the large cost of the monitor being produced, if LG or Samsung didn't offer such a warranty, believe me, they would be at a loss. It's like if you build computers, and you offer 10 year warranty, but the highest warranty you have in your computer is 3 years. What happens if after 3 years most of them break? You'll be in big trouble.
As those are A- panels, they have no warranty from the manufacture, as they are rejects. But they offer you a 1 year warranty. That is nice. However, if you check the terms and conditions, you'll see that they pretty much covers nothing, filled with conditions, to simply not cover you. Also, they bet big time, that's even if you fall on the warranty, you will give up trying to send this 27inch monitor to South Korea. And, depending on your live, potentially pay duty fees for the replacement one that you'll receive. Not to mention the time it will take for the monitor to reach their office, and process it. That is probably 1 month of wait time without a monitor. Dell however, allows you to keep the monitor, while they shipped you the replacement one. So, assuming your monitor is still usable, you always have a monitor on your desk. If it's not, well in 2-3 days you'll have a replacement one. In the case of Dell, specifically, the return shipping of the faulty monitor is also covered by them. In the replacement monitor box, you'll find a pre-paid shipping label, just swap the monitors, and stick the pre-paid shipping label over the old one, and call the appropriate mail carrier to come and pick up. That simple and easy.
So, even if you get those "perfect pixel" monitor that they claim you can still have other faults. Another fault not discussed is response time. What if you think you are getting 8ms response time panel, which you check reviews for actual performance of the monitor panel, and like it, but because it's faulty you get 12ms for some reason. You have no way of proving it doesn't deliver.
That said, monitor QA at panel manufactures are in batch. So if 1 is faulty in the batch, the entire batch is considered faulty (however it is rare that the ratio is like this, else they won't be doing by batch, as it's so many panel that they could have sold but not throwing them at the bin, or selling it for cheap to recuperate some of the cost). The highly recommended brands seams to buy these faulty batches and pick the best they have and use that. So, you could be mostly fine, without anything obviously wrong with it.
The monitors panel are put in generic cases, with buttons that don't do anything, with dual link DVI only. Some monitors don't even have brightness control or just a few predefined levels, depending on the brand and model. Some even just plays with the monitor brightness/contrast colors to emulate the screen brightness, but the back light is always fully lit at max brightness.
IN addition, those with on screen menus, despite extremely limited, uses generic monitor circuit, probably engineered years (or knock off) ago in China or something, still produced today. They have god awful input lag. More than 30ms. It's not even funny.
How about overclocking you say?
Well here is the thing:
1- IPS panels aren't fast enough yet, to deliver 120Hz. Maybe in a couple of years, but not today. SO teh results, is that the LCD liquid isnt' fast enougth at turning to catch up the speed it needs to deliver true 120Hz.
2- Dual link DVI specification, states (and you can check that), max resolution is 2560x1600 @ 60Hz colors OR 1920x1080 @ 120Hz. 1920x1080 for 120Hz. The resolution is not matching what you need. Meaning you are going over the specification. And that is why many people that got those monitor, can't pass 90Hz at best. And most have detected (if they tested for this), frame drop. The monitor is not displaying all the frames. DVI can't handle the load. Shorter and better wire might help, but still.
Pay a bit more, especially when you catch specials, and get yourself a proper monitor:
-> Not glossy.
-> Solid build quality.
-> Fully adjustable stand.
-> Full and proper warranty coverage.
-> A+ panel purchased.
-> Actual R&D to offer you a nice monitor features, use the best abilities of the monitor, and provide well designed circuitry for the best performance (low input lag).
-> More features
-> An actual proper on-screen menu with options
-> You can return if you don't like it
It just makes all sense. And it's not THAT more expensive, especially if you shop around or wait for specials.
Now, it must be noted that
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