Looks like that particular 460 is not a very good card for that machine because it does not have sufficient VRAM for hardware MPE. A 650 looks more than enough.
From the article:
Check the memory bandwidth of your current card and compare it to the intended upgrade card. For instance a GTX 460 is faster than a GTX 650 because of the memory bandwidth. Only if the memory bandwidth is higher after the upgrade, can you expect some performance gains if the rest of the system is up to it.
[Moved to Hardware forum.]
Thank You for a link
I dive into knowledge
It's a lot of things which I didnt know about ? Very helpful thread is "Balanced System" http://ppbm7.com/index.php/tweakers-page/83-balanced-systems/94-balanced-systems
After read this I realized If I buy for example GTX 650 I won't be happy because I will get only more less balanced system.
I rather want to upgrade my Workstation (MoBo, CPU, RAM, Graphic Card)
Thanks for You reply cc_merchant