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jpsousadesign
Beginner
111 Views

UHD on pentium 3825U

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Hi,

I've bougth a laptop with a pentium 3825U, a 5th Generation Intel® Processor, and a UHD TV.

https://ark.intel.com/content/www/us/en/ark/products/86348/intel-pentium-processor-3825u-2m-cache-1-...

For what I've seen, all 5th Generation Intel® Processors have integrated graphics and support UHD output.

However, I' not able to do  this... This laptop only outputs 1920x1080@60Hz.

The same TV, with the same cable on the same TV HDMI input is able to display 3840x2160@60Hz through a MacBook with an Intel HD graphics, so the problem is with my laptop.

I'm running windows 10 64, with updated drivers.

So what's going on?

intel1.jpg

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1 Solution
n_scott_pearson
Super User Retired Employee
76 Views

Actually, 4K@30Hz should, in theory, be possible, but this is not the first time that I have seen issue like this with the 3rd, 4th and 5th gen processors. I think that this is the result of the older, non-DCH graphics drivers that supported these generations (it is with the 6th gen (and newer) processors that the DCH-based drivers can be used).

Here are a bunch of links for related articles that have been published by ICS:

Hope this helps,

...S

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3 Replies
n_scott_pearson
Super User Retired Employee
95 Views

If you are using a HDMI connector on this laptop, I am not surprised by this result.

The UHD engine can only output in HDMI 1.4 format, which means that 4K@60Hz is simply not possible. In more-expensive machines, a LSPcon chip is included that takes the UHD engine's DisplayPort 1.2 output - which *can* support 4K@60Hz - and converts it to HDMI 2.0 format. If your laptop provides a DisplayPort output, you could use an external adapter to perform this same conversion. Without this type of output, however, this is not going to be possible.

Sorry,

...S

jpsousadesign
Beginner
89 Views

@n_scott_pearson thanks for the excelent explanation 👍

Its strange that all the info I've gathered on this processor is so generic. 

So not even 4K@25Hz could be possible through the laptop's HDMI output?

Since the laptop's other display output is a VGA (doesn't have a DisplayPort), should it be possible to run 2 FHD screens @60Hz, plus the laptop screen? Sure, intel's page about this unit says it can support 3 displays, but with what resolution and refresh rate?

C'mon Intel, is it that hard to be some more specific?

n_scott_pearson
Super User Retired Employee
77 Views

Actually, 4K@30Hz should, in theory, be possible, but this is not the first time that I have seen issue like this with the 3rd, 4th and 5th gen processors. I think that this is the result of the older, non-DCH graphics drivers that supported these generations (it is with the 6th gen (and newer) processors that the DCH-based drivers can be used).

Here are a bunch of links for related articles that have been published by ICS:

Hope this helps,

...S

View solution in original post

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