There are a couple more differences between the GT and GTX. The GTX has Memory Bandwidth: 51.2 GB/sec while the GT has 42.24 GB/sec. GTX also has higher shader operations, pixel fill rate, texture fill rate and vertex operations. GTX is also much quieter then the GT.
Now looking from the 2 cards you chose I would deffinately go for the Msi GTX. I say that mainly because the GT you chose is EVGA, even tho Evga has the best customer support out of anyone period the evga 7 series are known to be faulted and more then 50% of them have to be RMA'd back. You can check this out by going to the Evga forums, I have been doing alot of reserach on this since I was going to get an evga 7900GT KO Superclocked myself. The superclocked seem to be the ones having the most troubles but the rest of the 7900GT are also having same problems. We are talking about people having to RMA their cards 2 to 3 even 4 times before they get a working card and some dont even get that. Evga has just shipped this week a brand new batch of the GT cards that were suppose to fix some of those issues, the first batch is going to people waiting in line for RMA's and the retailers should be getting them next week or so. Noone is really sure if the new batch fixes stuff like they are suppose to since most people will be recivin theirs tomorrow or next week.
When I talk about the cards faults Im talking about stuff like:
1. Artifacts, tearing, fine colored dots, black spots with missing graphics.
2. Severe distortion.
3. Complete system hangup.
4. Flickering desktop about 1 or 2 second intervals. Desktop may have colors missing or black spots in windows, taskbar and start button.
As far as the 7900GT KO Superclocked they dont even have a fix for those yet so noone knows about those. If your interested in the newer batch of Evga you can go on their forums and get the model number for the new batch so as to make sure you get one of the new ones if you do decide to order one of theirs.
Also here is a link to their message board in case you wish to read up on it further.http://member.evga.c...asp?FORUM_ID=32