HP450 ProBook and 2560 x 1440 WQHD external monitor resolution

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FVAZ

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Oct 28, 2013
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This noteboook has an aditional graphic card AMD Radeon HD 8750M, but we can't activate this card, to use external monitor ASUS PB278Q, it continues to use the HD 4000 from Intel i5. Any suggestion ?
 
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Pete_the_Puma

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Mar 4, 2012
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Some PC's use a program such as lucidbox Virtu to switch between discrete GPU's when needed (mostly gaming) and lower power consuption and more processor driven GPU's when those are optimal (ie desktop, video transcoding and such).

There must be a way to disable the switching, or you could just try and see if the laptop displays to the monitor when you start gaming.

Not sure about the exact steps to do this, you could try and disable the HD4000 graphics from your bios? This might force onto the Radeon.

Curious to see how you fix this.

Also make sure your RadeonHD8750M is capable of WQHD output, it should be but with the crappy mobile GPUs ("M") you never know.

P
 
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k1114

k1114

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May 2, 2010
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The hd 4000 does not support 1440p/60hz except on displayport and thunderbolt so supermuncher's post should be the solution. The issue is that all laptop outputs (including the internal monitor) is controlled by the igpu with the discrete gpu just passing through.

Fyi, virtu is for desktops and was mostly dropped with IB. Power saving was useless as it increased it by having 2 gpus on and quicksync compatible software is still a very short list. Laptops work on the hardware level for switchable graphics and have it built into the graphics driver, amd's implementation is enduro, nvidia is optimus. Since all output is controlled by the hd 4000, you can't disable it. Also mobile gpus aren't "crappy" they are essentially the same as desktops with lower speeds to lower the power. Output res is typically limited by the port which is the issue here.
 
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Pete_the_Puma

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Laptop GPU's ARE crappy. They are NOT the same as desktop GPU's of any given name. They are re-branded lower grade models AND are down-clocked to reduce power draw. For example:

GTX 670: GK104 chip, 28nm, 256 bit Bus (Nice!)
GTX 670M: GF114 chip, 40nm, 192 bit Bus (Crappy!)

Radeon 7850: Pitcairn GPU, 28nm, 256 bit Bus, 1024 shaders (Nice!)
Radeon 7850M: Cape Verde GPU, 28nm, 128 bit Bus, 640 shaders (Crappy!)

Make no mistake, GPU's with a little "M" after their name suck ass.


 
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k1114

k1114

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You are comparing model numbers which is irrelevant. These are simply marketing tools to show performance tiers to their counterparts not similar models. The same reason you can't compare different generations model numbers is the same reason you can't compare desktop and laptop model numbers.
 
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Pete_the_Puma

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Then we agree, I just want to make sure OP understood that because most people get fooled when buying a laptop with a GTX670M thinking they will have similar performance to a GTX670.

Yes it is only a marketing strategy but the laptop GPU's are constantly one generation behind and as such could be described as lagging... or crappy.

 
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