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Mobile 4670 and both digital and analogue output problems?

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XtremOC

New Member
Joined
Nov 25, 2011
Hey,

Hope you guys can help me out... I'm banking on the tech geniuses here to be able to answer my question.

A couple of days ago, I flashed the A13 Bios to my Dell XPS 1645 which has the Radeon Mobile HD4670 graphics subsystem. My set-up uses a 20" external monitor plugged into the VGA output as my main monitor - and the built-in 17" screen on the portable as a secondary monitor.

Since flashing the bios, when I play games, the game will play really well for 3 to 10 minutes, then I get a sudden black screen and the computer powers immediately down. These are mostly MMO games and the issue does happen with all games tried so far.

I've been through a day of various testing and updates etc. with Dell support and their final suggestion is that it's because the portable's screen takes a digital output and I'm playing the game on an extended desktop to a screen on an analogue output.

Their opinion is that extending through VGA over-stresses the graphics sub-system and that the extra demand made by the games pushes it over the edge. They suggest that the old bios used to allow this - but that the new bios has closed out this option... thought it can take 10 minutes before the crash happens.

This all sounds a bit fishy to me, so I thought I'd ask you guys whether there might be some technical sense behind this idea. What do you think?

X
 
That sounds fishy to me too. Is there a way to find out what your video card temps are? That sounds more like overheating. Running the signal through a VGA out port shouldn't add any significant stress to the system. Maybe the new BIOS triggers overheating protection at a lower point?

I would first try upgrading to the latest mobile Catalyst drivers for your card, then finding some software to read the GPU temps. GPU-Z is a good one: http://www.techpowerup.com/downloads/2065/TechPowerUp_GPU-Z_v0.5.6.html
 
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