E4200 Video artifact solution?

I have been having problem with video artifact problem due to video memory corruption issue.

I came fount work around solution, which is disabling VT.
But are there any real solution/fix?

I use VMware, so I want to have VT enabled for maximum performance.



I sent my laptop back to dell to fix this issue, and they told me it was because RAM I installed is not from Dell, and wanted to charge $120 for 4GB RAM. LOL
I managed to get them to replace heat sink and motherboard and it seemed to have fixed, but it wasn't. Now I found what really was the cause.

 

Did you test out your RAM with memtest? Disabling VT should not fix a hardware issue (artifacts = 99.9% of the time hardware). Use known good DDR3 RAM (uber dirt cheap today).

 

There is nothing wrong with memory itself. It passes memtest.
But fails at 2D graphic test in Burn-In, which is test of video memory.

At first I thought it is hardware issue as well, and since I knew my RAM was good I had dell change motherboard and heatsink (had to cry a lot), but it did not fix the problem.

Today, I found out what was real problem from following posts. (Search for word corruption)

http://forum.notebookreview.com/dell-latitude-vostro-precision/306454-dell-latitude-e4200-info-92.html


Followed work around posted there, now it works without problem.

It seems problem occurs only when asymmetric ram is installed. Meaning ram of 2 different size/spec are installed. Since, on E4200 1GB of RAM is built into the motherboard, symmetric ram installation can only be achieved when 1GB RAM module is installed. Not what I want.


I also found out that WDDM 1.1 driver for GMA 4500 comes with Windows 7 does not cause this issue. But of course it is not as good as latest driver from Intel.