View Full Version : Open GL or Direct X

April 14th, 2010, 09:40 PM
Hi Everyone,

I am sure this has been answered, but I could not find a post when I searched the forum. I was wondering which provides better graphics & fps rates for Trainz 2009 & 2010, Open GL or Direct X?

Current spec's for my computer:

Intel Quad Core 2 Processor Q6700 (2.66 GHz)
8 Gig DDR 2 - 667MHz
BFG nVidia 9800GT Video Card
Intel Motherboard: DP35DP

Also, if I were to upgrade to an nvidia GTX260 or higher, would I see that much of a difference with Trainz software?

Thanks for the help!!


April 14th, 2010, 09:52 PM
Generally since you have an nVidia card you'll do better with OpenGL.

April 14th, 2010, 09:56 PM
I have a GT220 (see below) and I get better FPS with DirectX but slightly better grafics with OpenGL.

April 14th, 2010, 09:58 PM
Also, CMP (content manager) requires Open GL in order to function properly.


April 14th, 2010, 10:34 PM
Generally since you have an nVidia card you'll do better with OpenGL.

i have a nvidia card and it does better with directx.....

April 15th, 2010, 08:05 AM
On my HD4870 (Ati) It doesn't seem to make a different mmm.
Id like to see this thread go to a point where we can technically draw a line of differences between the two. Maybe my eyes just isn't aligned to notice the differences.

April 15th, 2010, 09:46 AM
I have an nvidia and get much better performance from OpenGL

April 15th, 2010, 10:36 AM
My machine (admittedly low-end) crawls and stutters in DirectX, but runs smooth as butter in OpenGL with my nVidia 8400GS. Perhaps card and driver version play a role but Trainz is unusual (AFAIK) in that it can use either OpenGL or DirectX. Try each and see what works best for you.

April 15th, 2010, 10:38 AM
I have 2x Nvidia 8800GTX cards in SLI mode.

But can't use OpenGL with Trainz, because the screen continually flashes to black.


I've read here that Trainz doesn't take advantage of SLi or Crossfire anyway. Can you disable SLi and make Trainz work under OpenGL?

April 15th, 2010, 10:43 AM
-i have a nvidia gts250 and i seem to do better in direct-x with current updated drivers.

April 15th, 2010, 10:54 AM
Thank you everyone for your reply to my thread!


April 15th, 2010, 01:49 PM
Hi All: I sometimes loose my bogeys on my engines in Dx..So what I do is switch it to Open GL, go back into surveyor mode and check to see that their back(Bogeys)..I have done this on several occasions and it seems to fix the problem, so I go back and change to Dx..It seems to run better in Dx..

Bob Cass:) :)